Keisuke Hosokawa
| Department of Computer and Network Engineering | Professor |
| Cluster II (Emerging Multi-interdisciplinary Engineering) | Professor |
| Center for Space Science and Radio Engineering | Professor |
Researcher Information
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- Apr. 2024
電気通信大学 宇宙・電磁環境研究センター センター長 - 01 Apr. 2019
電気通信大学大学院, 情報理工学研究科 情報・ネットワーク工学専攻, 教授 - 01 Apr. 2016 - 31 Mar. 2019
電気通信大学大学院, 情報理工学研究科 情報・ネットワーク工学専攻, 准教授 - 01 Jun. 2012 - 31 Mar. 2016
電気通信大学, 大学院 情報理工学研究科 情報・通信工学専攻, 准教授 - 01 Apr. 2007 - 31 May 2012
Department of Information and Communication Engineering, The University of Electro-Communications, 情報通信工学科, Assistant Professor - 01 Apr. 2007 - 31 May 2012
Department of Information and Communication Engineering, The University of Electro-Communications, Assistant Professor - 01 Apr. 2003 - 31 Mar. 2007
Department of Information and Communication Engineering, The University of Electro-Communications, 情報通信工学科, Research Associate - 01 Apr. 2003 - 31 Mar. 2007
Department of Information and Communication Engineering, The University of Electro-Communications, Research Associate - Apr. 2002 - Mar. 2003
京都大学大学院 理学研究科, 日本学術振興会特別研究員
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Paper
- Ionospheric Plasma Parameters Measured by SPIDER-2 Sounding Rocket During a Pulsating Aurora Event
Judit Pérez-Coll Jiménez; Nickolay Ivchenko; Tima Sergienko; Boris Strelnikov; Jonas Hedin; Daniel K. Whiter; Urban Brändström; Gabriel Giono; Christos Tolis; Yoshihiro Yokoyama; Keisuke Hosokawa; Yasunobu Ogawa
Journal of Geophysical Research: Space Physics, 130, 2, Feb. 2025
Scientific journal - Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE?
Sota Nanjo; Gabriel Arne Hofstra; Kazuo Shiokawa; Atsuki Shinbori; Satonori Nozawa; Keisuke Hosokawa
Earth, Planets and Space, 76, 1, Dec. 2024
Scientific journal - Variation of the Altitude of Auroral Emission During a Substorm Cycle: Stereoscopic Optical Observations During the LAMP Rocket Experiment
K. Hosokawa; Y. Miyoshi; M. Mcharg; V. Ledvina; D. Hampton; M. Lessard; M. Shumko; K. Asamura; T. Sakanoi; T. Mitani; T. Namekawa; M. Nosé; Y. Ogawa; A. Jaynes; A. Halford
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 129, 11, 12 Nov. 2024, Abstract
We estimated the altitude of aurora by combining data from all‐sky cameras at multiple places which were obtained during the LAMP sounding rocket experiment in Alaska on 5 March 2022. During the launch window of the rocket, three high‐speed all‐sky cameras were operative at three stations immediately below the trajectory of the rocket: Poker Flat, Venetie and Fort Yukon. The all‐sky cameras captured all‐sky images with a temporal resolution of 100 Hz (80 Hz for the Fort Yukon case). The method of altitude determination is based on analyses of time‐series of the optical intensity obtained from the all‐sky cameras in Venetie and Poker Flat covering the downrange area of the rocket trajectory. The estimated altitude of pulsating aurora during the rocket experiment was found to be consistent with that derived from the in‐situ observation of precipitating electrons with a model of optical emission, which confirms the feasibility of deriving the emission altitude through correlation analyses using time‐series. The estimated altitude of aurora decreased after the expansion onset of the substorm and stayed slightly below 100 km during the interval of pulsating aurora in the recovery phase. In particular, prompt and brief lowering of the auroral emission, well down to around 90 km, was detected during a transition of auroral form from discrete to diffuse which occurred ∼10 min after the onset. This result implies an existence of a process causing harder electron precipitation operative soon after the start of the expansion phase of auroral substorm.
Scientific journal - Observational Evidence for Three Time‐Scale Modulations in the Pulsating Aurora
Rui Chen; Yoshizumi Miyoshi; Xinliang Gao; Quanming Lu; Bruce T. Tsurutani; Keisuke Hosokawa; Tomoaki Hori; Yasunobu Ogawa; Shin‐Ichiro Oyama; Yoshiya Kasahara; Shoya Matsuda; Satoko Nakamura; Ayako Matsuoka; Iku Shinohara
Geophysical Research Letters, American Geophysical Union (AGU), 51, 16, 15 Aug. 2024, Abstract
We report an Arase‐all sky imager (ASI) conjugate event in which the pulsating aurora (PsA) has a one‐to‐one correspondence with chorus bursts. Wavelet analysis displayed three peaks at ∼0.3 Hz, 4 Hz, and >10 Hz, corresponding to the main pulsation, internal modulation, and fast modulation, respectively. These correspond to the old terms of ∼5–15 s pulsations, chorus risers/elements and subelements/subpackets, respectively. Electron “microbursts” correspond to the 4‐Hz peak. The internal and fast modulations are further verified by the analysis based on fast Fourier transform analyses. Moreover, the spatial distributions of the Fourier spectral amplitude show that the internal and fast modulations are well‐structured within auroral patches. The above results indicate a paradigm shift away from quasilinear theory which implicitly assumes diffuse wave generation. The three time‐scale modulations are consistent with coherent chorus which has been theoretically argued to lead to pitch angle transport three orders of magnitude faster.
Scientific journal - On the Factors Controlling the Relationship Between Type of Pulsating Aurora and Energy of Pulsating Auroral Electrons: Simultaneous Observations by Arase Satellite, Ground‐Based All‐Sky Imagers and EISCAT Radar
Y. Ito; K. Hosokawa; Y. Ogawa; Y. Miyoshi; F. Tsuchiya; M. Fukizawa; Y. Kasaba; Y. Kazama; S. Oyama; K. Murase; S. Nakamura; Y. Kasahara; S. Matsuda; S. Kasahara; T. Hori; S. Yokota; K. Keika; A. Matsuoka; M. Teramoto; I. Shinohara
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 129, 7, 16 Jul. 2024, Abstract
Pulsating Aurora (PsA) is one of the major classes of diffuse aurora associated with precipitation of a few to a few tens of keV electrons from the magnetosphere. Recent studies suggested that, during PsA, more energetic (i.e., sub‐relativistic/relativistic) electrons precipitate into the ionosphere at the same time. Those electrons are considered to be scattered at the higher latitude part of the magnetosphere by whistler‐mode chorus waves propagating away from the magnetic equator. However, there have been no actual cases of simultaneous observations of precipitating electrons causing PsA (PsA electrons) and chorus waves propagating toward higher latitudes; thus, we still do not quite well understand under what conditions PsA electrons become harder and precipitate to lower altitudes. To address this question, we have investigated an extended interval of PsA on 12 January 2021, during which simultaneous observations with the Arase satellite, ground‐based all‐sky imagers and the European Incoherent SCATter (EISCAT) radar were conducted. We found that, when the PsA shape became patchy, the PsA electron energy increased and Arase detected intense chorus waves at magnetic latitudes above 20°, indicating the propagation of chorus waves up to higher latitudes along the field line. A direct comparison between the irregularities of the magnetospheric electron density and the emission intensity of PsA patches at the footprint of the satellite suggests that the PsA morphology and the energy of PsA electrons are determined by the presence of “magnetospheric density ducts,” which allow chorus waves to travel to higher latitudes and thereby precipitate more energetic electrons.
Scientific journal - Exceptionally gigantic aurora in the polar cap on a day when the solar wind almost disappeared
Keisuke Hosokawa; Ryuho Kataoka; Takuo T. Tsuda; Yasunobu Ogawa; Satoshi Taguchi; Yongliang Zhang; Larry J. Paxton
Science Advances, American Association for the Advancement of Science (AAAS), 10, 25, 21 Jun. 2024, Revealing the origins of aurorae in Earth’s polar cap has long been a challenge since direct precipitation of energetic electrons from the magnetosphere is not always expected in this region of open magnetic field lines. Here, we introduce an exceptionally gigantic aurora filling the entire polar cap region on a day when the solar wind had almost disappeared. By combining ground-based and satellite observations, we proved that this unique aurora was produced by suprathermal electrons streaming directly from the Sun, which is known as “polar rain.” High-sensitivity imaging from the ground has visualized complex spatial structures of the polar rain aurora possibly manifesting the internal pattern of the solar wind or even the organizations in the chromosphere of the Sun.
Scientific journal - Field‐Aligned Currents Associated With Pulsating Auroral Patches: Observation With Magneto‐Impedance Magnetometer (MIM) Onboard Loss Through Auroral Microburst Pulsations (LAMP) Sounding Rocket
Masahito Nosé; Keisuke Hosokawa; Reiko Nomura; Mariko Teramoto; Kazushi Asamura; Yoshizumi Miyoshi; Takefumi Mitani; Takeshi Sakanoi; Taku Namekawa; Takeshi Kawano; Yoshihiro Iwanaga; Shunichi Tatematsu; Masafumi Hirahara; Alexa Halford; Mykhaylo Shumko; Marc R. Lessard; Kristina Lynch; Nicholaos Paschalidis; Allison N. Jaynes; Matthew G. McHarg
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 129, 6, 31 May 2024, Abstract
We made observations of magnetic field variations in association with pulsating auroras with the magneto‐impedance sensor magnetometer (MIM) carried by the Loss through Auroral Microburst Pulsations (LAMP) sounding rocket that was launched at 11:27:30 UT on 5 March 2022 from Poker Flat Research Range, Alaska. At an altitude of 200–250 km, MIM detected clear enhancements of the magnetic field by 15–25 nT in both the northward and westward components. From simultaneous observations with the ground all‐sky camera, we found that the footprint of LAMP at the 100 km altitude was located near the center of a pulsating auroral patch. The auroral patch had a dimension of ∼90 km in latitude and ∼25 km in longitude, and its major axis was inclined toward northwest. These observations were compared with results of a simple model calculation, in which local electron precipitation into the thin‐layer ionosphere causes an elliptical auroral patch. The conductivity within the patch is enhanced in the background electric field and as a result, the magnetic field variations are induced around the auroral patch. The model calculation results can explain the MIM observations if the electric field points toward southeast and one of the model parameters is adjusted. We conclude that the pulsating auroral patch in this event was associated with a one‐pair field‐aligned current that consists of downward (upward) currents at the poleward (equatorward) edge of the patch. This current structure is maintained even if the auroral patch is latitudinally elongated.
Scientific journal - New observational projects in New Zealand for studying radiation belt loss processes in the deep inner magnetosphere: instrumentation, operation by solar power and initial results
Yuki Obana; Kaori Sakaguchi; Masahito Nosé; Keisuke Hosokawa; Peter Jaquiery; Satoko Saita; Kazuo Shiokawa; Martin Connors; Akira Kadokura; Tsutomu Nagatsuma; Tanja Petersen
Earth, Planets and Space, Springer Science and Business Media LLC, 76, 1, 15 Mar. 2024, Abstract
This paper describes the instrumentation and the first results of an upper atmospheric observing project conducted in New Zealand. We operate an all-sky aurora camera and a 64-Hz sampling induction magnetometer at Middlemarch, as well as 1-Hz sampling fluxgate magnetometers which have been operative at three stations in New Zealand, Middlemarch, Eyrewell and Te Wharau. Green and red auroras corresponding to the 557.7 nm and 630.0 nm emissions, respectively, were observed on the night of 5 August 2019. Pc1 pulsations were observed in the frequency range of ~ 0.2–1 Hz before and after a small (minimum Dst = − 40 nT) geomagnetic storm during 4–6 October 2020. Before the geomagnetic storm, Pc1 pulsations with several center frequencies were observed regardless of local time. During the recovery phase, an IPDP (interval of pulsations of diminishing period) type of Pc1 and four subsequent intervals of Pc1s were detected. The Ionospheric Alfvén Resonator (IAR) was also identified with spectral resonance structures during this magnetic storm. Lower harmonic modes of the IAR were present throughout the local nighttime, but higher harmonic modes with frequency of 5–15 Hz seemed to disappear at the onset time of substorms. This is the first report of the IAR at such a high frequency range and this is the first IAR observation in the southern hemisphere. Examples of applying cross-phase analysis to observation data of fluxgate magnetometers are also given.
Graphical Abstract
Scientific journal - Thermospheric Wind Response to March 2023 Storm: Largest Wind Ever Observed With a Fabry-Perot Interferometer in Tromsø, Norway Since 2009
S. Oyama; H. Vanhamäki; L. Cai; A. Shinbori; K. Hosokawa; T. Sakanoi; K. Shiokawa; A. Aikio; I. I. Virtanen; Y. Ogawa; Y. Miyoshi; S. Kurita; N. Nishitani
Space Weather, 22, 3, Mar. 2024
Scientific journal - Multi-Instrument Observations of the Evolution of Polar Cap Patches Associated With Flow Shears and Particle Precipitation
Duan Zhang; Qing He Zhang; Kjellmar Oksavik; Zan Yang Xing; L. R. Lyons; Hui Gen Yang; Guo Jun Li; Keisuke Hosokawa; Atsuki Shinbori; Yu Zhang Ma; Yong Wang; Xiang Yu Wang
Journal of Geophysical Research: Space Physics, 128, 12, Dec. 2023
Scientific journal - Anomalous Long-Distance Propagation of ILS LOC Signals by the Es Layer and Its Impact on Aviation Receivers
Susumu Saito; Keisuke Hosokawa; Jun Sakai; Ichiro Tomizawa
Space Weather, 21, 11, 15 Nov. 2023, Peer-reviwed
Scientific journal - Simultaneous observations of equatorial plasma bubbles with an all-sky airglow imager and a HF Doppler sounding system in Taiwan
Hiromi Sejima; Keisuke Hosokawa; Hiroyuki Nakata; Jaroslav Chum; Chien-Hung Lin; Jia-Ting Lin
Earth, Planets and Space, Springer Science and Business Media LLC, 75, 1, 10 Oct. 2023, Abstract
High-Frequency Doppler (HFD) sounders at low-latitudes often detect characteristic oblique spreading Doppler traces in the spectrogram, known as Oblique Spread Structure (OSS). OSS has been expected to be generated by the dispersion of radio wave reflection due to equatorial plasma bubbles (EPBs). However, it has not yet been confirmed whether OSS is surely a manifestation of EPB by conducting simultaneous observations of EPB and OSS with different observational techniques. Additionally, it remains unclear what kinds of properties of EPB are reflected in the fine structure of OSS. In this study, we investigated three cases of OSSs and EPBs simultaneously observed by a HFD sounding system and an all-sky airglow imager in Taiwan. For the three cases presented here, the timing of OSS occurrence in the HFD data well coincided with that of the EPB appearance in the airglow data. The frequency shift of OSS is quantitatively explained assuming a radio wave reflection at 250–300 km altitudes. These results strongly indicate that OSS is formed by electron density variations at F-region altitudes accompanying EPB; thus, OSS is a manifestation of EPB in the HFD observations. Furthermore, it was suggested that the fine structure of OSS reflected the branching structure of EPB when the multiple branches of EPB reached the intermediate reflection point of the HFD observation. The detection of EPB occurrence and its fine structure using HFD observation enables monitoring of EPB regardless of weather conditions, which will contribute to monitoring the space weather impact of EPBs, for example, on GNSS navigation, in a wide area.
Graphical Abstract
Scientific journal - Periodic oscillations of Doppler frequency excited by the traveling ionospheric disturbances associated with the Tonga eruption in 2022
Hiroyuki Nakata; Keisuke Hosokawa; Susumu Saito; Yuichi Otsuka; Ichoro Tomizawa
Earth, Planets and Space, Springer Science and Business Media LLC, 75, 1, 10 Oct. 2023, Abstract
The explosive eruption of the Hunga Tonga-Hunga Ha’apai volcano on 15 January 2022 generated atmospheric waves traveling around the Earth, which caused ionospheric disturbances on various spatio-temporal scales. A HF Doppler sounding system in Japan detected characteristic ionospheric disturbances showing periodic oscillations in the Doppler frequency with a period of ~ 4 min. In this study, such periodic oscillations were examined by comparing Doppler frequency data with Total Electron Content data obtained by Global Navigation Satellite System. The observed periodic oscillations in the Doppler frequency were characterized by a sawtooth or S-letter shaped variation, implying the passage of the traveling ionospheric disturbances through the reflection points of the HF Doppler sounding system. It was also found that the periodic oscillations occurred prior to the arrival of the tropospheric Lamb wave excited by the Tonga eruption. From the total electron content data, the traveling ionospheric disturbances causing the periodic oscillations were excited by the tropospheric Lamb waves at the conjugate point in the southern hemisphere, namely, the electric field perturbations due to the Lamb waves in the southern hemisphere mapped onto the sensing area of the HF Doppler sounding system in the northern hemisphere along the magnetic field lines. The periodic oscillations were observed only in the path between Chofu transmitter and Sarobetsu receiver, whose the radio propagation path is almost aligned in the north–south direction. This suggests that the traveling ionospheric disturbance has a structure elongating in the meridional direction. The variation in the Doppler frequency was reproduced by using a simple model of the propagation of the traveling ionospheric disturbances and the resultant motion of the reflection point. As a result, the vertical motion of the reflection point associated with the periodic oscillations was estimated to be about 1 km. It is known that 4-min period variations are sometimes observed in association with earthquakes, which is due to resonances of acoustic mode waves propagating between the ground and the lower ionosphere. Therefore, a similar resonance structure in the southern hemisphere is a plausible source of the traveling ionospheric disturbances detected in the northern hemisphere.
Graphical Abstract
Scientific journal - Monitoring of equatorial plasma bubbles using aeronautical navigation system: a feasibility study
Keisuke Hosokawa; Susumu Saito; Hiroyuki Nakata; Chien-Hung Lin; Jia-Ting Lin; Pornchai Supnithi; Ichiro Tomizawa; Jun Sakai; Toru Takahashi; Takuya Tsugawa; Michi Nishioka; Mamoru Ishii
Earth, Planets and Space, Springer Science and Business Media LLC, 75, 1, 03 Oct. 2023, Abstract
It has long been known that field-aligned irregularities within equatorial plasma bubbles (EPBs) can cause long-range propagation of radio waves in the VHF frequencies such as those used for TV broadcasting through the so-called forward scattering process. However, no attempt has been made to use such anomalous propagations of VHF radio waves for wide-area monitoring of EPBs. In this study, we investigated the feasibility of monitoring of EPBs using VHF radio waves used for aeronautical navigation systems such as VHF Omnidirectional radio Range (VOR). There are 370 VOR stations in the Eastern and Southeastern Asian region that can be potentially used as Tx stations for the observations of anomalous propagation. We have examined the forward scattering conditions of VHF waves using the magnetic field model and confirmed that it is possible to observe the EPB-related anomalous propagation if we set up Rx stations in Okinawa (Japan), Taiwan, and Thailand. During test observations conducted in Okinawa since 2021, no signal has been received that was clearly caused by anomalous propagation due to EPBs. This is simply because EPBs have not developed to high latitudes during the observation period due to the low solar activity. In March 2023, however, possible indications of EPB-related scattering were detected in Okinawa which implies the feasibility of observing EPBs with the current observation system. We plan to conduct pilot observations in Taiwan and Thailand in future to further evaluate the feasibility of this monitoring technique.
Graphical Abstract
Scientific journal - Correspondence of Pi2 pulsations, aurora luminosity, and plasma flux fluctuation near a substorm brightening aurora: Arase observations
L. Chen; K. Shiokawa; Y. Miyoshi; S. Oyama; C‐W. Jun; Y. Ogawa; K. Hosokawa; Y. Kazama; S. Y. Wang; S. W. Y. Tam; T. F. Chang; B. J. Wang; K. Asamura; S. Kasahara; S. Yokota; T. Hori; K. Keika; Y. Kasaba; A. Kumamoto; F. Tsuchiya; M. Shoji; Y. Kasahara; A. Matsuoka; I. Shinohara; S. Nakamura
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 128, 10, 28 Sep. 2023, Abstract
Although many substorm‐related observations have been made, we still have limited insight into propagation of the plasma and field perturbations in Pi2 frequencies (∼7‐25 mHz) in association with substorm aurora, particularly from the auroral source region in the inner magnetosphere to the ground. In this study, we present conjugate observations of a substorm brightening aurora using an all‐sky camera and an inner‐magnetospheric satellite Arase at L ∼ 5. A camera at Gakona (62.39oN, 214.78oE), Alaska, observed a substorm auroral brightening on December 28, 2018, and the footprint of the satellite was located just equatorward of the aurora. Around the timing of the auroral brightening, the satellite observed a series of quasi‐periodic variations in the electric and magnetic fields and in the energy flux of electrons and ions. We demonstrate that the diamagnetic variations of thermal pressure and medium‐energy ion energy flux in the inner magnetosphere show approximately one‐to‐one correspondence with the oscillations in luminosity of the substorm brightening aurora and high‐latitudinal Pi2 pulsations on the ground. We also found their anti‐correlation with low‐energy electrons. Cavity‐type Pi2 pulsations were observed at mid‐ and low‐latitudinal stations. Based on these observations, we suggest that a wave phenomenon in the substorm auroral source region, like ballooning type instability, play an important role in the development of substorm and related auroral brightening and high‐latitude Pi2, and that the variation of the auroral luminosity was directly driven by keV electrons which were modulated by Alfven waves in the inner magnetosphere.
Scientific journal - GEOspace X-ray imager (GEO-X)
Yuichiro Ezoe; Ryu Funase; Harunori Nagata; Yoshizumi Miyoshi; Hiroshi Nakajima; Ikuyuki Mitsuishi; Kumi Ishikawa; Masaki Numazawa; Yosuke Kawabata; Shintaro Nakajima; Ryota Fuse; Ralf C. Boden; Landon Kamps; Tomokage Yoneyama; Kouichi Hagino; Yosuke Matsumoto; Keisuke Hosokawa; Satoshi Kasahara; Junko Hiraga; Kazuhisa Mitsuda; Masaki Fujimoto; Munetaka Ueno; Atsushi Yamazaki; Hiroshi Hasegawa; Takefumi Mitani; Yasuhiro Kawakatsu; Takahiro Iwata; Hiroyuki Koizumi; Hironori Sahara; Yoshiaki Kanamori; Kohei Morishita; Daiki Ishi; Aoto Fukushima; Ayata Inagaki; Yoko Ueda; Hiromi Morishita; Yukine Tsuji; Runa Sekiguchi; Takatoshi Murakawa; Kazuma Yamaguchi; Rei Ishikawa; Daiki Morimoto; Yudai Yamada; Shota Hirai; Yuki Nobuhara; Yownin Albert M. Leung; Yamato Itoigawa; Ryo Onodera; Satoru Kotaki; Shotaro Nakamura; Ayumi Kiuchi; Takuya Matsumoto; Midori Hirota; Kazuto Kashiwakura
Journal of Astronomical Telescopes, Instruments, and Systems, SPIE-Intl Soc Optical Eng, 9, 03, 12 Sep. 2023, Peer-reviwed
Scientific journal - Three-dimensional ionospheric conductivity associated with pulsating auroral patches: Reconstruction from ground-based optical observations
Mizuki Fukizawa; Yoshimasa Tanaka; Yasunobu Ogawa; Keisuke Hosokawa; Tero Raita
Copernicus GmbH, 04 Aug. 2023, Abstract. Pulsating auroras (PsAs) appear over a wide area within the aurora oval from the midnight sector to the noon sector. In previous studies, observations by magnetometers onboard satellites have reported the presence of field-aligned currents (FACs) near the edges and interiors of pulsating aurora patches. PsAs are thus a key research target for understanding the magnetosphere–ionosphere coupling process. However, the three-dimensional (3-D) structure of the electric currents has yet to be clarified, since each satellite observation is limited to the single dimension along its orbit. This study’s aim was a reconstruction of the 3-D structure of ionospheric conductivity, which is necessary to elucidate the 3-D ionospheric current. Tomographic analysis was used to estimate the 3-D ionospheric conductivity for rapidly changing auroral phenomena such as PsAs. The reconstructed Hall conductivity reached its maximum value of 1.4 × 10–3 S m–1 at 94 km altitude, while the Pedersen conductivity reached its maximum value of 2.6 × 10–4 S m–1 at 116 km altitude. The Pedersen conductivity, which is driven by the motion of electrons, exhibited a secondary peak value of 9.9 × 10–5 S m–1 at 86 km altitude. The electron Pedersen conductivity maximum value in the D region was approximately 38 % of the ion Pedersen conductivity maximum value in the E region. The FAC, derived under the assumption of a uniform ionospheric electric field, was approximately 70 µA m–2 near the edge of the PsA patch. This FAC value was approximately 10 times that observed by satellites in previous studies. If the conductivity around the patch is underestimated or the assumption of a uniform field distribution is incorrect, the FAC could be overestimated. On the contrary, due to sharper boundary structures, the FAC could actually have had such a large FAC. - An Implication of Detecting the Internal Modulation in a Pulsating Aurora: A Conjugate Observation by the Arase Satellite and All‐Sky Imagers
S. Nanjo; S. Ebukuro; S. Nakamura; Y. Miyoshi; S. Kurita; S.‐I. Oyama; Y. Ogawa; K. Keika; Y. Kasahara; S. Kasahara; A. Matsuoka; T. Hori; S. Yokota; S. Matsuda; I. Shinohara; S.‐Y. Wang; Y. Kazama; C.‐W. Jun; M. Kitahara; K. Hosokawa
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 128, 8, 03 Aug. 2023, Abstract
A physical mechanism to produce pulsating aurora (PsA) has been considered to be the interaction of the electron and the chorus wave generated near the equatorial plane of the magnetosphere. A recent observation of high temporal resolution of chorus waves by the Arase satellite revealed that the presence or absence of the internal modulation of PsA, which is a characteristic sub‐second scintillation at 3 ± 1 Hz within each optical pulsation, is closely related to the discreteness of the element structure of the chorus wave. However, it is still unclear what parameters (or conditions) control the discreteness of the element and the existence of the internal modulation of PsA. In this study, we discuss parameters that determine the presence or absence of the internal modulation of PsA and element structure of chorus by showing a conjugate observation of PsA/chorus by ground‐based cameras and the Arase satellite. During the event, the occurrence of internal modulation increased temporally. The wave data from the satellite show that the repetitive frequency of elements was ∼6 Hz when the internal modulation was indistinct, while the repetitive frequency was ∼3 Hz when the internal modulation was distinct. The particle measurements suggest that this difference was caused by changes in the density and the temperature anisotropy of the hot electron. The internal modulation was clearly observed when the density of hot electrons decreased and the temperature anisotropy relaxed after the injection. Observations of internal modulations from the ground might allow us to estimate the parameters such as energetic electron density and temperature anisotropy in the magnetosphere.
Scientific journal - A Ground‐Based Instrument Suite for Integrated High‐Time Resolution Measurements of Pulsating Aurora With Arase
K. Hosokawa; S.‐I. Oyama; Y. Ogawa; Y. Miyoshi; S. Kurita; M. Teramoto; S. Nozawa; T. Kawabata; Y. Kawamura; Y.‐M. Tanaka; H. Miyaoka; R. Kataoka; K. Shiokawa; U. Brändström; E. Turunen; T. Raita; M. G. Johnsen; C. Hall; D. Hampton; Y. Ebihara; Y. Kasahara; S. Matsuda; I. Shinohara; R. Fujii
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 128, 8, 28 Jul. 2023, Abstract
A specialized ground‐based system has been developed for simultaneous observations of pulsating aurora (PsA) and related magnetospheric phenomena with the Arase satellite. The instrument suite is composed of (a) six 100 Hz sampling high‐speed all‐sky imagers (ASIs), (b) two 10 Hz sampling monochromatic ASIs observing 427.8 and 844.6 nm auroral emissions, (c) a 20 Hz sampling fluxgate magnetometer. The 100 Hz ASIs were deployed in four stations in Scandinavia and two stations in Alaska, which have been used for capturing the main pulsations and quasi 3 Hz internal modulations of PsA at the same time. The 10 Hz sampling monochromatic ASIs have been operative in Tromsø, Norway with the 20 Hz sampling magnetometer. Combination of these multiple instruments with the European Incoherent SCATter (EISCAT) radar enables us to detect the low‐altitude ionization due to energetic electron precipitation during PsA and further to reveal the ionospheric electrodynamics behind PsA. Since the launch of the Arase satellite, the data from these instruments have been examined in comparison with the wave and particle data from the satellite in the magnetosphere. In the future, the system can be utilized not only for studies of PsA but also for other classes of aurora in close collaboration with the planned EISCAT_3D project.
Scientific journal - IMF Dependence of Midnight Bifurcation in the Thermospheric Wind at an Auroral Latitude Based on Nine Winter Measurements in Tromsø, Norway
S. Oyama; K. Hosokawa; H. Vanhamäki; A. Aikio; T. Sakanoi; L. Cai; I. I. Virtanen; K. Shiokawa; N. Nishitani; A. Shinbori; Y. Ogawa
Geophysical Research Letters, American Geophysical Union (AGU), 50, 14, 24 Jul. 2023
Scientific journal - Geomagnetic activity dependence and dawn-dusk asymmetry of thermospheric winds from 9-year measurements with a Fabry–Perot interferometer in Tromsø, Norway
Shin-ichiro Oyama; Anita Aikio; Takeshi Sakanoi; Keisuke Hosokawa; Heikki Vanhamäki; Lei Cai; Ilkka Virtanen; Marcus Pedersen; Kazuo Shiokawa; Atsuki Shinbori; Nozomu Nishitani; Yasunobu Ogawa
Earth, Planets and Space, Springer Science and Business Media LLC, 75, 1, 05 May 2023, Abstract
Ion drag associated with the ionospheric plasma convection plays an important role in the high-latitude thermospheric dynamics, yet changes in the thermospheric wind with geomagnetic activity are not fully understood. We performed a statistical analysis of the thermospheric wind measurements with a Fabry–Perot interferometer (FPI; 630 nm wavelength) in Tromsø, Norway, in the winter months for 9 years. The measurements were sorted by a SuperMAG (SME) index, and a quiet-time wind pattern was defined as an hourly mean under SME ≤ 40 nT. The quiet-time wind pattern can be expected to be represented by a pressure gradient associated with the solar radiation and a geostrophic force balance. With an increase in the geomagnetic activity level, the thermospheric wind turned over from eastward to westward at dusk and increased the equatorward magnitude from midnight to dawn. Deviations from the quiet-time wind presented similar patterns in the direction with the ionospheric plasma convection but were larger in magnitude at dusk than at dawn. This is the first study to report a dawn-dusk asymmetry of the thermospheric wind acceleration feature and signatures of the eastward wind acceleration at dawn by ion drag.
Graphical Abstract
Scientific journal - Simultaneous Precipitation of Sub-Relativistic Electron Microburst and Pulsating Aurora Electrons
Taku Namekawa; Takefumi Mitani; Kazushi Asamura; Yoshizumi Mioshi; Keisuke Hosokawa; Marc R Lessard; Chrystal Moser; Alexa J. Halford; Takeshi Sakanoi; Miki Kawamura; Masahito Nosé; Reiko Nomura; Mariko Teramoto; Mykhaylo Shumko; Kristina A Lynch; Allison N Jaynes; Matthew G McHarg
Geophysical Research Letters, 16 Apr. 2023, Peer-reviwed
Scientific journal - Atmospheric and ionospheric waves induced by the Hunga eruption on 15 January 2022; Doppler sounding and infrasound
Jaroslav Chum; Tereza Šindelářová; Petra Koucká Knížová; Kateřina Podolská; Jan Rusz; Jiří Baše; Hiroyuki Nakata; Keisuke Hosokawa; Michael Danielides; Carsten Schmidt; Leon Knez; Jann-Yenq Liu; María Graciela Molina; Mariano Fagre; Zama Katamzi-Joseph; Hiroyo Ohya; Tatsuya Omori; Jan Laštovička; Dalia Obrazová Burešová; Daniel Kouba; Jaroslav Urbář; Vladimír Truhlík
Geophysical Journal International, Oxford University Press (OUP), 233, 2, 1429-1443, 24 Dec. 2022, Peer-reviwed, Summary
The massive explosive eruption of the Hunga volcano on 15 January 2022 generated atmospheric waves that were recorded around the globe and affected the ionosphere. The paper focuses on observations of atmospheric waves in the troposphere and ionosphere in Europe, however, a comparison with observations in East Asia, South Africa and South America is also provided. Unlike most recent studies of waves in the ionosphere based on the detection of changes in the total electron content, this study builds on detection of ionospheric motions at specific altitudes using continuous Doppler sounding. In addition, much attention is paid to long-period infrasound (periods longer than ∼50 s), which in Europe is observed simultaneously in the troposphere and ionosphere about an hour after the arrival of the first horizontally propagating pressure pulse (Lamb wave). It is shown that the long-period infrasound propagated approximately along the shorter great circle path, similar to the previously detected pressure pulse in the troposphere. It is suggested that the infrasound propagated in the ionosphere probably due to imperfect refraction in the lower thermosphere. The observation of infrasound in the ionosphere at such large distances from the source (over 16 000 km) is rare and differs from ionospheric infrasound detected at large distances from the epicenters of strong earthquakes, because in the latter case the infrasound is generated locally by seismic waves. An unusually large traveling ionospheric disturbance (TID) observed in Europe and associated with the pressure pulse from the Hunga eruption is also discussed. Doppler sounders in East Asia, South Africa and South America did not record such a significant TID. However, TIDs were observed in East Asia around times when Lamb waves passed the magnetically conjugate points. A probable observation of wave in the mesopause region in Europe approximately 25 min after the arrival of pressure pulse in the troposphere using a 23.4 kHz signal from a transmitter 557 km away and a coincident pulse in electric field data are also discussed.
Scientific journal, English - Observation of Source Plasma and Field Variations of a Substorm Brightening Aurora at L ∼ 6 by a Ground-Based Camera and the Arase Satellite on 12 October 2017
L. Chen; K. Shiokawa; Y. Miyoshi; S. Oyama; C. W. Jun; Y. Ogawa; K. Hosokawa; Y. Inaba; Y. Kazama; S. Y. Wang; S. W.Y. Tam; T. F. Chang; B. J. Wang; K. Asamura; S. Kasahara; S. Yokota; T. Hori; K. Keika; Y. Kasaba; A. Kumamoto; F. Tsuchiya; M. Shoji; Y. Kasahara; A. Matsuoka; I. Shinohara; S. Imajo; S. Nakamura; M. Kitahara
Journal of Geophysical Research: Space Physics, 127, 11, Nov. 2022
Scientific journal - Proton aurora and relativistic electron microbursts scattered by electromagnetic ion cyclotron waves
Shumko, M; Gallardo-Lacourt, B; Halford, A. J; Blum, L. W; Liang, J; Miyoshi, Y; Hosokawa, K; Donovan, E; Mann, I. R; Murphy, K; Spanswick, E. L; Blake, J. B; Looper, M. D; Gillies, D. M
Front. Astron. Space Sci., 9:975123, doi:10.3389/fspas.2022.975123, Aug. 2022, Peer-reviwed
Scientific journal, English - Reconstruction of precipitating electrons and three-dimensional structure of a pulsating auroral patch from monochromatic auroral images obtained from multiple observation points
Mizuki Fukizawa; Takeshi Sakanoi; Yoshimasa Tanaka; Yasunobu Ogawa; Keisuke Hosokawa; Björn Gustavsson; Kirsti Kauristie; Alexander Kozlovsky; Tero Raita; Urban Brändström; Tima Sergienko
Annales Geophysicae, Copernicus GmbH, 40, 4, 475-484, 12 Jul. 2022, Abstract. In recent years, aurora observation networks usinghigh-sensitivity cameras have been developed in the polar regions. Thesenetworks allow dimmer auroras, such as pulsating auroras (PsAs), to beobserved with a high signal-to-noise ratio. We reconstructed the horizontaldistribution of precipitating electrons using computed tomography withmonochromatic PsA images obtained from three observation points. Thethree-dimensional distribution of the volume emission rate (VER) of the PsAwas also reconstructed. The characteristic energy of the reconstructedprecipitating electron flux ranged from 6 to 23 keV, and the peak altitudeof the reconstructed VER ranged from 90 to 104 km. We evaluated the resultsusing a model aurora and compared the model's electron density with theobserved one. The electron density was reconstructed correctly to someextent, even after a decrease in PsA intensity. These results suggest thatthe horizontal distribution of precipitating electrons associated with PsAscan be effectively reconstructed from ground-based optical observations.
Scientific journal - Instantaneous Achievement of the Hall and Pedersen–Cowling Current Circuits in Northern and Southern Hemispheres During the Geomagnetic Sudden Commencement on 12 May 2021
Kikuchi, T; Araki, T; Hashimoto, K. K; Ebihara, Y; Tanaka, T; Nishimura, Y; Vichare, G; Sinha, A. K; Chum, J; Hosokawa, K; Tomizawa, I; Tanaka, Y; Kadokura, A
Front. Astron. Space Sci., 9:879314, doi:10.3389/fspas.2022.879314, May 2022, Peer-reviwed
Scientific journal, English - An automated auroral detection system using deep learning: real-time operation in Tromsø, Norway
Nanjo, S; Nozawa, S; Yamamoto; M. Kawabata, T; Johnsen, M. G; Tsuda, T. T; Hosokawa, K
Scientific Reports, 12, doi:10.1038/s41598-022-11686-8, May 2022, Peer-reviwed
Scientific journal, English - Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower-Band to Upper-Band Frequencies in the Source Region
Mitsunori Ozaki; Satoshi Yagitani; Kazuo Shiokawa; Yoshimasa Tanaka; Yasunobu Ogawa; Keisuke Hosokawa; Yoshiya Kasahara; Yusuke Ebihara; Yoshizumi Miyoshi; Kousuke Imamura; Ryuho Kataoka; Shin-ichiro Oyama; Teppei Chida; Akira Kadokura
GEOPHYSICAL RESEARCH LETTERS, 49, 9, May 2022
Scientific journal, English - On the importance of using event-specific chorus wave dynamics in simulating diffuse electron precipitation
Yu, Y; K. Hosokawa; B. Ni; V. Jordanova; Y. Miyoshi; X. Tian; L. Ma; J. Cao
Journal of Geophysical Research: Space Physics, 127, doi:10.1029/2021JA029918, Apr. 2022, Peer-reviwed
Scientific journal, English - Propagation characteristics of sporadic E and medium-scale traveling ionospheric disturbances (MSTIDs): statistics using HF Doppler and GPS-TEC data in Japan
Ryo Matsushima; Keisuke Hosokawa; Jun Sakai; Yuichi Otsuka; Mitsumu K. Ejiri; Michi Nishioka; Takuya Tsugawa
EARTH PLANETS AND SPACE, 74, 1, Apr. 2022
Scientific journal, English - Energetic electron precipitations by chorus waves and its impact on the middleatmosphere
Yoshizumi Miyoshi; Shinji Saito; Keisuke Hosokawa; Kazushi Asamura; Shinichiro Oyama; Takefumi Mitani; Takeshi Sakanoi; Antti Kero; Esa Turunen; Pekka Verronen
Copernicus {GmbH}, 28 Mar. 2022
Scientific journal - GEO-X (GEOspace X-ray imager)
Yuichiro Ezoe; Ryu Funase; Harunori Nagata; Yoshizumi Miyoshi; Hiroshi Nakajima; Ikuyuki Mitsuishi; Kumi Ishikawa; Yosuke Kawabata; Shintaro Nakajima; Landon Kamps; Masaki Numazawa; Tomokage Yoneyama; Kouichi Hagino; Yosuke Matsumoto; Keisuke Hosokawa; Satoshi Kasahara; Junko Hiraga; Kazuhisa Mitsuda; Masaki Fujimoto; Munetaka Ueno; Atsushi Yamazaki; Hiroshi Hasegawa; Takefumi Mitani; Yasuhiro Kawakatsu; Takahiro Iwata; Hiroyuki Koizumi; Hironori Sahara; Yoshiaki Kanamori; Kohei Morishita
SPACE TELESCOPES AND INSTRUMENTATION 2022: ULTRAVIOLET TO GAMMA RAY, 12181, 2022
International conference proceedings, English - Statistical Study of Electron Density Enhancements in the Ionospheric F Region Associated With Pulsating Auroras
M. Fukizawa; T. Sakanoi; Y. Ogawa; T. T. Tsuda; K. Hosokawa
Journal of Geophysical Research: Space Physics, 126, 12, Dec. 2021
Scientific journal - Simultaneous Pulsating Aurora and Microburst Observations With Ground-Based Fast Auroral Imagers and CubeSat FIREBIRD-II
Miki Kawamura; Takeshi Sakanoi; Mizuki Fukizawa; Yoshizumi Miyoshi; Keisuke Hosokawa; Fuminori Tsuchiya; Yuto Katoh; Yasunobu Ogawa; Kazushi Asamura; Shinji Saito; Harlan Spence; Arlo Johnson; Shin'ichiro Oyama; Urban Brandstrom
GEOPHYSICAL RESEARCH LETTERS, 48, 18, Sep. 2021
Scientific journal, English - Dayside Cusp Aurorae and Ionospheric Convection Under Radial Interplanetary Magnetic Fields
Li; Hsien-Ming, Shue; Jih-Hong, Taguchi; Satoshi, Nose; Masahito; Hosokawa; Keisuke, Ruohoniemi; J. Michael; Zhang, Yongliang; Wing, Simon; Lester, Mark
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 126, 5, May 2021, Peer-reviwed
Scientific journal, English - Editorial: Special Issue: "SuperDARN / Studies of Geospace Dynamics - Today and Future"
Akira Sessai Yukimatu; Adrian Grocott; Evan G. Thomas; Tsutomu Nagatsuma; Nozomu Nishitani; Keisuke Hosokawa; Masakazu Watanabe
Polar Science, Elsevier BV, 100690-100690, May 2021
Scientific journal - Horizontal movement of polar mesospheric clouds observed from the Himawari-8 geostationary meteorological satellite
Hozumi, Y; Tsuda, T. T; Hosokawa, K; Ando, Y; Suzuki, H; Murata, T; Nakamura, T
Journal of Geophysical Research, 126, doi:10.1029/2021JD035081, 2021, Peer-reviwed
Scientific journal, English - Periodicities and colors of pulsating auroras: DSLR camera observations from the International Space Station
Nanjo, S; Hozumi, Y; Hosokawa, K; Kataoka, R; Miyoshi, Y; Oyama, S.-I
Journal of Geophysical Research, 126, doi:10.1029/2021JA029564, 2021, Peer-reviwed
Scientific journal, English - Software-defined radio-based HF doppler receiving system
Nakata, H; K. Nozaki; Y. Oki; K. Hosokawa; K. K. Hashimoto; T. Kikuchi; J. Sakai; I. Tomizawa; S. Saita
Earth, Planets and Space, Springer Science and Business Media LLC, 73, 1, doi:10.1186/s40623-021-01547-5, 2021, Peer-reviwed, Abstract
High-frequency Doppler (HFD) sounding is one of the major remote sensing techniques used for monitoring the ionosphere. Conventional systems for HFDs mainly utilize analog circuits. However, existing analog systems have become difficult to maintain as the number of people capable of working with analog circuits has declined. To solve this problem, we developed an alternate HFD receiver system based on digital signal processing. The software-defined radio (SDR) technique enables the receiver to be set up without the knowledge of analog circuit devices. This approach also downsizes the system and reduces costs. A highly stabilized radio system for both the transmitter and receiver is necessary for stable long-term observations of various phenomena in the ionosphere. The global positioning system disciplined oscillator with an accuracy of $${10}^{-11}$$ compensates for the frequency stability required by the new receiving system. In the new system, four frequencies are received and signal-processed simultaneously. The dynamic range of the new system is wider (> 130 dB) than that of the conventional system used in HFD observations conducted by the University of Electro-Communications in Japan. The signal-to-noise ratio significantly improved by 20 dB. The new digital system enables radio waves to be received with much smaller amplitudes at four different frequencies. The new digital receivers have been installed at some of the stations in the HFD observation network in Japan and have already captured various ionospheric phenomena, including medium-scale traveling ionospheric disturbances and sudden commencement induced electric field fluctuations, which indicates the feasibility of SDR for actual ionospheric observations. The new digital receiver is simple, inexpensive, and small in size, which makes it easy to deploy new receiving stations in Japan and elsewhere. These advantages of the new system will help drive the construction of a wide HFD observation network.
Graphical Abstract
Scientific journal, English - Auroral heating of plasma patches due to high-latitude reconnection
Díaz Pena, J; J. Semeter; Y. Nishimura; R. Varney; A. Reimer; M. Hairston; M. Zettergren; M. Hirsch; O. Verkhoglyadova; K. Hosokawa; K. Shiokawa
Journal of Geophysical Research, 126, doi:10.1029/2021JA029657, 2021, Peer-reviwed
Scientific journal, English - Penetration of the electric fields of the geomagnetic sudden commencement over the globe as observed with the HF Doppler sounders and magnetometers
Kikuchi, T; J. Chum; I. Tomizawa; K. K. Hashimoto; K. Hosokawa; Y. Ebihara; K. Hozumi; P. Supnithi
Earth Planets Space, 73, 10, ---, 2021, Peer-reviwed
Scientific journal, English - Magnetic conjugacy of Pc1 waves and isolated proton precipitation at subauroral latitudes: Importance of ionosphere as intensity modulation region
Ozaki, M; K. Shiokawa; R. B. Horne; M. J. Engebretson; M. Lessard; Y. Ogawa; K. Hosokawa; M. Nosé; Y. Ebihara; A. Kadokura; S. Yagitani; Y. Miyoshi; S. Hashimoto; S. S. Ashwini; K. S. Gopi; K. Seemala; C.-W. Jun
Geophysical Research Letters, 48, 5, ---, 2021, Peer-reviwed
Scientific journal, English - Visualizing sporadic E using aeronautical navigation signals at VHF frequencies
Hosokawa, K; K., Kimura; J. Sakai; S. Saito; I. Tomizawa; M. Nishioka; T. Tsugawa; M. Ishii
Journal of Space Weather and Space Climate, 11, 6, ---, 2021, Peer-reviwed
Scientific journal, English - Plasma sheet thinning due to loss of near-Earth magnetotail plasma
Tretler, R; T. Tatsuno; K. Hosokawa
Journal of Plasma Physics, 87, 10, ---, 2021, Peer-reviwed
Scientific journal, English - Energy-resolved detection of precipitating electrons of 30–100 keV by a sounding rocket associated with dayside chorus waves
Sugo, S; O. Kawashima; S. Kasahara; K. Asamura; R. Nomura; Y. Miyoshi; Y. Ogawa; K. Hosokawa; T. Mitani; T. Namekawa; T. Sakanoi; M. Fukizawa; N. Yagi; Y. Fedorenko; A. Nikitenko; S. Yokota; K. Keika; T. Hori; C. Koehler
Journal of Geophysical Research, 126, -, ---, 2021, Peer-reviwed
Scientific journal, English - Over-darkening of pulsating aurora
Hosokawa, K; Y. Miyoshi; S.-I. Oyama; Y. Ogawa; S. Kurita; Y. Kasahara; Y. Kasaba; S. Yagitani; S. Matsuda; M. Ozaki; F. Tsuchiya; A. Kumamoto; T. Takashima; I. Shinohara; R. Fujii
Journal of Geophysical Research, 126, -, ---, 2021, Peer-reviwed
Scientific journal, English - What controls the luminosity of polar cap airglow patches?: Implication from airglow measurements in Eureka, Canada in comparison with SuperDARN convection pattern
Hosokawa, K; M. Nagata; K. Shiokawa; Y. Otsuka
Polar Science, 28, -, ---, 2021, Peer-reviwed
Scientific journal, English - Spatial Evolution of Wave-Particle Interaction Region Deduced From Flash-Type Auroras and Chorus-Ray Tracing
Mitsunori Ozaki; Tomohiro Inoue; Yoshimasa Tanaka; Satoshi Yagitani; Yoshiya Kasahara; Kazuo Shiokawa; Yoshizumi Miyoshi; Kousuke Imamura; Keisuke Hosokawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 126, 7, 10.1029/2021JA029254, 2021, Peer-reviwed
Scientific journal, English - Rocket Observation of Sub-Relativistic Electrons in the Quiet Dayside Auroral Ionosphere
T. Namekawa; T. Mitani; K. Asamura; Y. Miyoshi; K. Hosokawa; Y. Ogawa; S. Saito; T. Hori; S. Sugo; O. Kawashima; S. Kasahara; R. Nomura; N. Yagi; M. Fukizawa; T. Sakanoi; Y. Saito; A. Matsuoka; I. Shinohara; Y. Fedorenko; A. Nikitenko; C. Koehler
Journal of Geophysical Research, American Geophysical Union (AGU), 126, 7, 10.1029/2020JA, 2021, Peer-reviwed
Scientific journal, English - Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
Y. Miyoshi; K. Hosokawa; S. Kurita; S.-I. Oyama; Y. Ogawa; S. Saito; I. Shinohara; A. Kero; E. Turunen; P. T. Verronen; S. Kasahara; S. Yokota; T. Mitani; T. Takashima; N. Higashio; Y. Kasahara; S. Matsuda; F. Tsuchiya; A. Kumamoto; A. Matsuoka; T. Hori; K. Keika; M. Shoji; M. Teramoto; S. Imajo; C. Jun; S. Nakamura
Scientific Reports, Springer Nature, 11, 11, 2021, Peer-reviwed, Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.
Scientific journal, English - PSTEP: project for solar–terrestrial environment prediction
Kanya Kusano; Kiyoshi Ichimoto; Mamoru Ishii; Yoshizumi Miyoshi; Shigeo Yoden; Hideharu Akiyoshi; Ayumi Asai; Yusuke Ebihara; Hitoshi Fujiwara; Tada-Nori Goto; Yoichiro Hanaoka; Hisashi Hayakawa; Keisuke Hosokawa; Hideyuki Hotta; Kornyanat Hozumi; Shinsuke Imada; Kazumasa Iwai; Toshihiko Iyemori; Hidekatsu Jin; Ryuho Kataoka; Yuto Katoh; Takashi Kikuchi; Yûki Kubo; Satoshi Kurita; Haruhisa Matsumoto; Takefumi Mitani; Hiroko Miyahara; Yasunobu Miyoshi; Tsutomu Nagatsuma; Aoi Nakamizo; Satoko Naka
Earth, Planets, Space, -, -, 2021, Peer-reviwed
Scientific journal, English - Variations in Cosmic Noise Absorption in Association With Equatorward Development of the Pulsating Auroral Patch: A Case Study to Estimate the Energy Spectra of Auroral Precipitating Electrons
Taishiro Miyamoto; Shin-ichiro Oyama; Tero Raita; Keisuke Hosokawa; Yoshizumi Miyoshi; Yasunobu Ogawa; Satoshi Kurita
Journal of Geophysical Research, 126, 9, 10.1029/2021JA029309, 2021, Peer-reviwed
Scientific journal, English - Occurrence distribution of polar cap patches: dependences on UT, season and hemisphere
Kagawa, A; Hosokawa, K; Ogawa, Y; Ebihara, Y; Kadokura
Journal of Geophysical Research, 126, 1, doi:10.1029/2020JA028538, 2021, Peer-reviwed
Scientific journal, English - The Quasipersistent Feature of Highly Structured Field‐Aligned Currents in the Duskside Auroral Oval: Conjugate Observation Via Swarm Satellites and a Ground All‐Sky Imager
Y. Yokoyama; S. Taguchi; T. Iyemori; K. Hosokawa
Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), 125, 7, Jul. 2020, Peer-reviwed
Scientific journal - Asymmetric Development of Auroral Surges in the Northern and Southern Hemispheres
Herbert Akihito Uchida; Ryuho Kataoka; Akira Kadokura; Kiyoka Murase; Akira Sessai Yukimatu; Yoshizumi Miyoshi; Kazuo Shiokawa; Yusuke Ebihara; Keisuke Hosokawa; Ayako Matsuoka; S. Kurita; Shigeru Fujita; I. Shinohara
Geophys. Res. Lett., 47, Jun. 2020, Peer-reviwed, True
Scientific journal, English - Development of low-cost multi-wavelength imager system for studies of aurora and airglow
Y. Ogawa; Y. Tanaka; A. Kadokura; K. Hosokawa; Y. Ebihara; T. Motoba; B. Gustavsson; U. Brändström; Y. Sato; S. Oyama; M. Ozaki; T. Raita; F. Sigernes; S. Nozawa; K. Shiokawa; M. Kosch; K. Kauristie; C. Hall; S. Suzuki; Y. Miyoshi; A. Gerrard; H. Miyaoka; R. Fujii
Polar Science, Mar. 2020, Peer-reviwed
Scientific journal - Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves
K. Hosokawa; Y. Miyoshi; M. Ozaki; S. I. Oyama; Y. Ogawa; S. Kurita; Y. Kasahara; Y. Kasaba; S. Yagitani; S. Matsuda; F. Tsuchiya; A. Kumamoto; R. Kataoka; K. Shiokawa; T. Raita; E. Turunen; T. Takashima; I. Shinohara; R. Fujii
Scientific reports, 10, 1, 3380, 25 Feb. 2020, Peer-reviwed
Scientific journal - Observations of equatorial plasma bubbles using a low-cost 630.0-nm all-sky imager in Ishigaki Island, Japan
Hosokawa, K; K. Takami; S. Saito; Y. Ogawa; Y. Otsuka; K. Shiokawa; C.-H. Chen; C.-H. Lin
Earth, Planets and Space, 72, 1, doi:10.1186/s40623-020-01187-1, 2020, Peer-reviwed
Scientific journal, English - Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm
Hashimoto K. K; T. Kikuchi; I. Tomizawa; K. Hosokawa; J. Chum; D. Buresova; M. Nose; K. Koga
Earth, Planets and Space, Springer Science and Business Media LLC, 72, 1, doi:10.1186/s40623-020-01196-0, 2020, Peer-reviwed
Scientific journal, English - A monitoring network for anomalous propagation of aeronautical VHF radio waves due to sporadic E in Japan
Hosokawa, K; J. Sakai; I. Tomizawa; S. Saito; T. Tsugawa; M. Nishioka; M. Ishii
Earth, Planets and Space, 72, doi:10.1186/s40623-020-01216-z, 2020, Peer-reviwed
Scientific journal, English - Estimation of the emission altitude of pulsating aurora using the five-wavelength photometer
Kawamura, Y; K. Hosokawa; S. Nozawa; Y. Ogawa; T. Kawabata; S.-I. Oyama; Y. Miyoshi; S. Kurita; R. Fujii
Earth, Planets and Space, Springer Science and Business Media LLC, 72, 1, doi:10.1186/s40623-020-01229-8, 2020, Peer-reviwed
Scientific journal, English - Loss of the Rarefaction Wave during Plasma Sheet Thinning
Tretler, R; T. Tatsuno; K. Hosokawa
Plasma and Fusion Research, 15, doi:10.1585/pfr.15.2401053, 2020, Peer-reviwed
Scientific journal, English - Arase observation of the source region of auroral arcs and diffuse auroras in the inner magnetosphere
Shiokawa, K; M. Nose; S. Imajo; Y. Tanaka; Y. Miyoshi; K. Hosokawa; M. Connors; M. Engebretson; Y. Kazama; S.-Y. Wang; S. W; Y. Tam; Tzu-Fang Chang; Bo-Jhou Wang; K. Asamura; S. Kasahara; S. Yokota; T. Hori; K. Keika; Y. Kasaba; M. Shoji; Y. Kasahara; A. Matsuoka; I. Shinohara
Journal of Geophysical Research, American Geophysical Union (AGU), 125, 8, doi:10.1029/2019JA027310, 2020, Peer-reviwed
Scientific journal, English - Anomalous propagation of radio waves from distant ILS localizers due to ionospheric sporadic‐E
Sakai, J; Saito, S; Hosokawa, K; Tomizawa, I
Space Weather, 18, doi:10.1029/2020SW002517, 2020, Peer-reviwed
Scientific journal, English - Plasma waves causing relativistic electron precipitation events at International Space Station: Lessons from conjunction observations with Arase satellite
Kataoka, R; Y. Asaoka; S. Torii; S. Nakahira; H. Ueno; S. Miyake; Y. Miyoshi; S. Kurita; M. Shoji; Y. Kasahara; M. Ozaki; S. Matsuda; A. Matsuoka; Y. Kasaba; I. Shinohara; K. Hosokawa; H. A. Uchida; K. Murase; Y. Tanaka
Journal of Geophysical Research, 125, 9, doi:10.1029/2020JA027875, 2020, Peer-reviwed
Scientific journal, English - Relativistic Electron Microbursts as High Energy Tail of Pulsating Aurora Electrons
Miyoshi, Y; Saito, S; Kurita, S; Asamura, K; Hosokawa, K; Sakanoi, T
Geophysical Research Letters, American Geophysical Union (AGU), 47, 21, doi:10.1029/2020GL090360, 2020, Peer-reviwed
Scientific journal, English - OI 630.0‐nm and N2 1PG emissions in pulsating aurora events observed by an optical spectrograph at Tromsø, Norway
Tsuda, T. T; Li, C; Hamada, S; Hosokawa, K; Oyama, S.‐i; Nozawa, S
Journal of Geophysical Research, American Geophysical Union (AGU), 125, 12, doi:10.1029/2020JA028250, 2020, Peer-reviwed
Scientific journal, English - Aurora in the Polar Cap: A Review
Hosokawa, K; A. Kullen; S. Milan; J. Reidy; Y. Zou; H. Frey; R. Maggiolo; R. Fear
Space Science Review, 216, doi:10.1007/s11214-020-0637-3, 2020, Peer-reviwed
Scientific journal, English - Fine-scale visualization of aurora in a wide area using color digital camera images from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Journal of Geophysical Research, American Geophysical Union (AGU), 125, 3, doi:10.1029/2019JA027729, 2020, Peer-reviwed
Scientific journal, English - Multi-instrument Observations of Ion-Neutral Coupling in the Dayside Cusp
Billett, D. D.; K. Hosokawa; A. Grocott; J. A. Wild; A. L. Aruliah; Y. Ogawa; S. Taguchi
Geophysical Research Letters, Jan. 2020, Peer-reviwed - Imaging of polar cap patches with a low-cost airglow camera: Pilot observations in Svalbard, Norway
K. Hosokawa; Y. Ogawa; S. Taguchi
Earth, Planets and Space, EPSP-D-19-00160, 71, Nov. 2019, Peer-reviwed - Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres
Y.-M. Tanaka; T. Nishiyama; A. Kadokura; M. Ozaki; Y. Miyoshi; K. Shiokawa; S.-I. Oyama; R. Kataoka; M. Tsutsumi; K. Nishimura; K. Sato; Y. Kasahara; A. Kumamoto; F. Tsuchiya; M. Fukizawa; M. Hikishima; S. Matsuda; A. Matsuoka; I. Shinohara; M. Nosé; T. Nagatsuma; M. Shinohara; A. Fujimoto; M. Teramoto; R. Nomura; A. Sessai Yukimatu; K. Hosokawa; M. Shoji; R. Latteck
Journal of Geophysical Research: Space Physics, 124, 9626-9639, 10 Oct. 2019, Peer-reviwed - Spatiotemporal development of pulsating auroral patch associated with discrete chorus elements: Arase and PWING observations
Ozaki, M; K. Shiokawa; Y. Miyoshi; K. Hosokawa; S. Oyama; S. Yagitani; Y. Kasahara; Y. Kasaba; S. Matsuda; R. Kataoka; Y. Ebihara; Y. Ogawa; Y. Otsuka; S. Kurita; R. C. Moore; Y.-M. Tanaka; M. Nosé; T. Nagatsuma; M. Connors; N. Nishitani; M. Hikishima; A. Kumamoto; F. Tsuchiya; A. Kadokura; T. Nishiyama; T. Inoue; K. Imamura; A. Matsuoka; I. Shinohara
2019 URSI ASIA-PACIFIC RADIO SCIENCE CONFERENCE (AP-RASC), 18776063, Jun. 2019, Peer-reviwed
International conference proceedings, English - Velocity Rotation Events in the Outer Magnetosphere Near the Magnetopause
Matsui, H; C.J. Farrugia; J. Goldstein; R. B. Torbert; M. R. Argall; H. Vaith; C. T. Russell; R. J; Strangeway; B. L. Giles; C. J. Pollock; S. Taguchi; K. Hosokawa
Journal of Geophysical Research Space Physics, 124, May 2019
Scientific journal, English - Geographical and Seasonal Variability of Mesospheric Bores Observed from the International Space Station
Hozumi Yuta; Saito Akinori; Sakanoi Takeshi; Yamazaki Atsushi; Hosokawa Keisuke; Nakamura Takuji
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 124, 5, 3775-3785, May 2019, Peer-reviwed - Visualization of rapid electron precipitation via chorus element wave-particle interactions.
Mitsunori Ozaki; Yoshizumi Miyoshi; Kazuo Shiokawa; Keisuke Hosokawa; Shin-Ichiro Oyama; Ryuho Kataoka; Yusuke Ebihara; Yasunobu Ogawa; Yoshiya Kasahara; Satoshi Yagitani; Yasumasa Kasaba; Atsushi Kumamoto; Fuminori Tsuchiya; Shoya Matsuda; Yuto Katoh; Mitsuru Hikishima; Satoshi Kurita; Yuichi Otsuka; Robert C Moore; Yoshimasa Tanaka; Masahito Nosé; Tsutomu Nagatsuma; Nozomu Nishitani; Akira Kadokura; Martin Connors; Takumi Inoue; Ayako Matsuoka; Iku Shinohara
Nature communications, 10, 1, 257-257, 16 Jan. 2019, Peer-reviwed, True
Scientific journal, English - Tracking the region of high correlation between pulsating aurora and chorus: Simultaneous observations with Arase satellite and ground‐based all‐sky imager in Russia
Kawamura, S; K. Hosokawa; S. Kurita; S. Oyama; Y. Miyoshi; Y. Kasahara; M. Ozaki; S. Matsuda; A. Matsuoka; B. Kozelov; Y. Kawamura; I. Shinohara
Journal of Geophysical Research, 124, doi:10.1029/2019JA026496, 2019, Peer-reviwed
Scientific journal, English - A statistical study of anomalous VHF propagation due to the sporadic-E layer in the air-navigation band
Sakai, J; K. Hosokawa; I. Tomizawa; S. Saito
Radio Science, 54, 5, doi:10.1029/2018RS006781-439, 2019, Peer-reviwed
Scientific journal, English - Geographical and seasonal variability of mesospheric bores observed by IMAP/VISI
Hozumi, Y; A. Saito; T. Sakanoi; A. Yamazaki; K. Hosokawa; T. Nakamura
Journal of Geophysical Research, 124, doi:10.1029/2019JA026635, 2019, Peer-reviwed
Scientific journal, English - Airglow Patches in the Polar Cap Region: A Review
Hosokawa, K; Y. Zou; Y. Nishimura
Space Science Review, 215, doi:10.1007/s11214-019-0616-8, 2019, Peer-reviwed
Scientific journal, English - Diffuse and Pulsating Aurora
Nishimura, Y; M. R. Lessard; Y. Katoh; Y. Miyoshi; E. Grono; N. Partamies; N. Sivadas; K. Hosokawa; M. Fukizawa; M. Samara; R. G. Michell; R. Kataoka; T. Sakanoi; D. K. Whiter; S. Oyama; Y. Ogawa; S. Kurita
Space Science Reviews, in press, 2019, Peer-reviwed - Plasma flow in the north-south aligned auroral region equatorward of the dayside auroral oval
Taguchi, S; K. Hosokawa; Y. Ogawa
J. Geophys. Res., doi:10.1029/2019JA026895, in press, 2019, Peer-reviwed - Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station
Kataoka, R; T. Nishiyama; Y. -M. Tanaka; A. Kadokura; H. A. Uchida; Y. Ebihara; M. K. Ejiri; Y. Tomikawa; M. Tsutsumi; K. Sato; Y. Miyoshi; K. Shiokawa; S. Kurita; Y. Kasahara; M. Ozaki; K. Hosokawa; S. Matsuda; I. Shinohara; T. Takashima; T. Sato
Earth, Planet and Space, 71, 9, Jan. 2019, Peer-reviwed
Scientific journal, English - Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras
M. Fukizawa; T. Sakanoi; Y. Miyoshi; K. Hosokawa; K. Shiokawa; Y. Katoh; Y. Kazama; A. Kumamoto; F. Tsuchiya; Y. Miyashita; Y. M. Tanaka; Y. Kasahara; M. Ozaki; A. Matsuoka; S. Matsuda; M. Hikishima; S. Oyama; Y. Ogawa; S. Kurita; R. Fujii
Geophysical Research Letters, 45, 23, 12,661-12,668, 16 Dec. 2018, Peer-reviwed
Scientific journal, English - A new five-wavelength photometer operated in TromsO (69.6 degrees N, 19.2 degrees E)
Nozawa Satonori; Kawabata Tetsuya; Hosokawa Keisuke; Ogawa Yasunobu; Tsuda Takuo; Mizuno Akira; Fujii Ryoichi; Hall Chris
EARTH PLANETS AND SPACE, 70, 11 Dec. 2018, Peer-reviwed - Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm
Shin ichiro Oyama; Takuo T. Tsuda; Keisuke Hosokawa; Yasunobu Ogawa; Yoshizumi Miyoshi; Satoshi Kurita; Antti E. Kero; Ryoichi Fujii; Yoshimasa Tanaka; Akira Mizuno; Tetsuya Kawabata; Björn Gustavsson; Thomas Leyser
Earth, Planets and Space, 70, 1, 01 Dec. 2018, Peer-reviwed
Scientific journal - A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E)
Satonori Nozawa; Tetsuya Kawabata; Keisuke Hosokawa; Yasunobu Ogawa; Takuo Tsuda; Akira Mizuno; Ryoichi Fujii; Chris Hall
Earth, Planets and Space, 70, 1, 01 Dec. 2018, Peer-reviwed
Scientific journal - Mesospheric bores at southern midlatitudes observed by ISS-IMAP/VISI: a first report of an undulating wave front
Hozumi Yuta; Saito Akinori; Sakanoi Takeshi; Yamazaki Atsushi; Hosokawa Keisuke
ATMOSPHERIC CHEMISTRY AND PHYSICS, 18, 22, 16399-16407, 19 Nov. 2018, Peer-reviwed - Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations
Ozaki, M; K. Shiokawa; Y. Miyoshi; K. Hosokawa; S. Oyama; S. Yagitani; Y. Kasahara; Y. Kasaba; S. Matsuda; R. Kataoka; Y. Ebihara; Y. Ogawa; Y. Otsuka; S. kurita; R. C. Moore; Y. -M. Tanaka; M. Nose; T. Nagatsuma; M. Connors; N. Nishitani; Y. Katoh; M. Hikishima; A. Kumamoto; F. Tsuchiya; A. Kadokura; T. Nishiyama; T. Inoue; K. Imamura; A. Matsuoka; I. Shinohara
Geophys. Res. Lett., 45, 22, Nov. 2018, Peer-reviwed
Scientific journal, English - Auroral molecular-emission effects on the atomic oxygen line at 777.4nm
Oyama Shin-ichiro; Tsuda Takuo T; Hosokawa Keisuke; Ogawa Yasunobu; Miyoshi Yoshizumi; Kurita Satoshi; Kero Antti E; Fujii Ryoichi; Tanaka Yoshimasa; Mizuno Akira; Kawabata Tetsuya; Gustavsson Bjorn; Leyser Thomas
EARTH PLANETS AND SPACE, 70, Oct. 2018, Peer-reviwed
English - Initial report on polar mesospheric cloud observations by Himawari-8
T. T. Tsuda; Y. Hozumi; K. Kawaura; K. Hosokawa; H. Suzuki; T. Nakamura
Atmos. Meas. Tech., 11, 6163-6168, 2018, Peer-reviwed
Scientific journal, English - Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde data
Tsuda T. T; M. T. Rietveld; M. J. Kosch; S. Oyama; K. Hosokawa; S. Nozawa; T. Kawabata; A. Mizuno; Y. Ogawa
Earth, Planets and Space, 70, 40, doi:10.1186/s40623-018-0805-9, 2018, Peer-reviwed
Scientific journal, English - GPS amplitude and phase scintillation associated with polar cap auroral forms
P. T. Jayachandran; A. M. Hamza; K. Hosokawa; H. Mezaoui; K. Shiokawa
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 164, 185-191, Nov. 2017, Peer-reviwed
Scientific journal, English - Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network
Kazuo Shiokawa; Yasuo Katoh; Yoshiyuki Hamaguchi; Yuka Yamamoto; Takumi Adachi; Mitsunori Ozaki; Shin-Ichiro Oyama; Masahito Nose; Tsutomu Nagatsuma; Yoshimasa Tanaka; Yuichi Otsuka; Yoshizumi Miyoshi; Ryuho Kataoka; Yuki Takagi; Yuhei Takeshita; Atsuki Shinbori; Satoshi Kurita; Tomoaki Hori; Nozomu Nishitani; Iku Shinohara; Fuminori Tsuchiya; Yuki Obana; Shin Suzuki; Naoko Takahashi; Kanako Seki; Akira Kadokura; Keisuke Hosokawa; Yasunobu Ogawa; Martin Connors; J. Michael Ruohoniemi; Mark Engebretson; Esa Turunen; Thomas Ulich; Jyrki Manninen; Tero Raita; Antti Kero; Arto Oksanen; Marko Back; Kirsti Kauristie; Jyrki Mattanen; Dmitry Baishev; Vladimir Kurkin; Alexey Oinats; Alexander Pashinin; Roman Vasilyev; Ravil Rakhmatulin; William Bristow; Marty Karjala
EARTH PLANETS AND SPACE, 69, Nov. 2017, Peer-reviwed
Scientific journal, English - Statistical investigation of Na layer response to geomagnetic activity using resonance scattering measurements by Odin/OSIRIS
T. T. Tsuda; T. Nakamura; M. K. Ejiri; T. Nishiyama; K. Hosokawa; T. Takahashi; J. Gumbel; J. Hedin
GEOPHYSICAL RESEARCH LETTERS, 44, 12, 5943-5950, Jun. 2017, Peer-reviwed
Scientific journal, English - Horizontal profile of a moving red line cusp aurora
S. Taguchi; Y. Chiba; K. Hosokawa; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 122, 3, 3509-3525, Mar. 2017, Peer-reviwed
Scientific journal, English - Depletion of mesospheric sodium during extended period of pulsating aurora
T. Takahashi; K. Hosokawa; S. Nozawa; T. T. Tsuda; Y. Ogawa; M. Tsutsumi; Y. Hiraki; H. Fujiwara; T. D. Kawahara; N. Saito; S. Wada; T. Kawabata; C. Hall
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 122, 1, 1212-1220, 2017, Peer-reviwed
Scientific journal, English - Periodic creation of polar cap patches from auroral transients in the cusp
K. Hosokawa; S. Taguchi; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 121, 6, 5639-5652, Jun. 2016, Peer-reviwed
Scientific journal, English - Edge of polar cap patches
K. Hosokawa; S. Taguchi; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 121, 4, 3410-3420, Apr. 2016, Peer-reviwed
Scientific journal, English - Lower thermospheric wind variations in auroral patches during the substorm recovery phase
Shin-ichiro Oyama; Kazuo Shiokawa; Yoshizumi Miyoshi; Keisuke Hosokawa; Brenton J. Watkins; Junichi Kurihara; Takuo T. Tsuda; Christopher T. Fallen
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 121, 4, 3564-3577, Apr. 2016, Peer-reviwed
Scientific journal, English - GPS scintillations in the high latitudes during periods of dayside and nightside reconnection
L. B. N. Clausen; J. I. Moen; K. Hosokawa; J. M. Holmes
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 121, 4, 3293-3309, Apr. 2016, Peer-reviwed
Scientific journal, English - Spatiotemporally resolved electrodynamic properties of a Sun-aligned arc over Resolute Bay
G. W. Perry; H. Dahlgren; M. J. Nicolls; M. Zettergren; J. -P. St-Maurice; J. L. Semeter; T. Sundberg; K. Hosokawa; K. Shiokawa; S. Chen
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 120, 11, 9977-9987, Nov. 2015, Peer-reviwed
Scientific journal, English - Three-dimensional imaging of the plasma parameters of a moving cusp aurora
Satoshi Taguchi; Keisuke Hosokawa; Yasunobu Ogawa
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 133, 98-110, Oct. 2015, Peer-reviwed
Scientific journal, English - On the symmetry of ionospheric polar cap patch exits around magnetic midnight
J. Moen; K. Hosokawa; N. Gulbrandsen; L. B. N. Clausen
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 120, 9, 7785-7797, Sep. 2015, Peer-reviwed
Scientific journal, English - Multi-instrument, high-resolution imaging of polar cap patch transportation
E. G. Thomas; K. Hosokawa; J. Sakai; J. B. H. Baker; J. M. Ruohoniemi; S. Taguchi; K. Shiokawa; Y. Otsuka; A. J. Coster; J. -P. St.-Maurice; K. A. McWilliams
RADIO SCIENCE, 50, 9, 904-915, Sep. 2015, Peer-reviwed
Scientific journal, English - Ionospheric variation during pulsating aurora
K. Hosokawa; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 120, 7, 5943-5957, Jul. 2015, Peer-reviwed
Scientific journal, English - Introduction to special section on pulsating aurora and related magnetospheric phenomena
Keisuke Hosokawa; Yoshizumi Miyoshi; Wen Li
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 120, 7, 5341-5343, Jul. 2015, Peer-reviwed
Scientific journal, English - A thermospheric Na layer event observed up to 140km over Syowa Station (69.0 degrees S, 39.6 degrees E) in Antarctica
T. T. Tsuda; X. Chu; T. Nakamura; M. K. Ejiri; T. D. Kawahara; A. S. Yukimatu; K. Hosokawa
GEOPHYSICAL RESEARCH LETTERS, 42, 10, 3647-3653, May 2015, Peer-reviwed
Scientific journal, English - Investigating the particle precipitation of a moving cusp aurora using simultaneous observations from the ground and space
Satoshi Taguchi; Keisuke Hosokawa; Yasunobu Ogawa
PROGRESS IN EARTH AND PLANETARY SCIENCE, 2, 11, May 2015, Peer-reviwed
Scientific journal, English - CDF data archive and integrated data analysis platform for ERG-related ground data developed by ERG Science Center (ERG-SC)
Hori, T; Y. Miyashita; Y. Miyoshi; K. Seki; T. Segawa; Y.-M. Tanaka; K. Keika; M. Shoji; I. Shinohara; K. Shiokawa; Y. Otsuka; S. Abe; A. Yoshikawa; K. Yumoto; Y. Obana; N. Nishitani; A. S. Yukimatu; T. Nagatsuma; M. Kunitake; K. Hosokawa; Y. Ogawa; K. T. Murata; M. Nose; H. Kawano; T. Sakanoi
J. Space Sci. Info. Jpn, Japan Aerospace Exploration Agency, 4, 75-89, 2015, Peer-reviwed
Scientific journal, English - Direct observations of blob deformation during a substorm
T. Ishida; Y. Ogawa; A. Kadokura; K. Hosokawa; Y. Otsuka
ANNALES GEOPHYSICAE, 33, 5, 525-530, 2015, Peer-reviwed
Scientific journal, English - Interhemispheric auroral symmetry and asymmetry from ground-based conjugate observations
Sato, N; A. Kadokura; T. Motoba; K. Hosokawa; G. Bjornsson; Th. Saemundsson
Auroral Dynamics and Space Weather, Geophysical Monograph 215, Edited by Yongliang Zhang and Larry J. Paxton, American Geophysical Union, doi:10.1002/9781118978719.ch11-161, 2015, Peer-reviwed
Scientific journal, English - Observations of GPS scintillation during an isolated auroral substorm
Keisuke Hosokawa; Yuichi Otsuka; Yasunobu Ogawa; Takuya Tsugawa
Progress in Earth and Planetary Science, Springer Berlin Heidelberg, 1, 1, 01 Dec. 2014, Peer-reviwed, Invited
Scientific journal, English - 3D imaging reveals electrodynamics of polar cap aurora
Hanna Dahlgren; Gareth Perry; Jean-Pierre St Maurice; Torbjorn Sundberg; Keisuke Hosokawa; Joshua L. Semeter; Michael J. Nicolls; Kazuo Shiokawa
ASTRONOMY & GEOPHYSICS, 55, 5, Oct. 2014, Peer-reviwed
Scientific journal, English - 3D imaging reveals electrodynamics of polar cap aurora
Hanna Dahlgren; Gareth Perry; Jean-Pierre St Maurice; Torbjorn Sundberg; Keisuke Hosokawa; Joshua L. Semeter; Michael J. Nicolls; Kazuo Shiokawa
ASTRONOMY & GEOPHYSICS, 55, 5, Oct. 2014, Peer-reviwed, Invited
Scientific journal, English - Storm time enhancements of 630.0 nm airglow associated with polar cap patches
J. Sakai; K. Hosokawa; S. Taguchi; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 119, 3, 2214-2228, Mar. 2014, Peer-reviwed
Scientific journal, English - Storm time enhancements of 630.0 nm airglow associated with polar cap patches
J. Sakai; K. Hosokawa; S. Taguchi; Y. Ogawa
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 119, 3, 2214-2228, 2014, Peer-reviwed
Scientific journal, English - Global imaging of polar cap patches with dual airglow imagers
K. Hosokawa; S. Taguchi; K. Shiokawa; Y. Otsuka; Y. Ogawa; M. Nicolls
GEOPHYSICAL RESEARCH LETTERS, 41, 1, 1-6, Jan. 2014, Peer-reviwed
Scientific journal, English - Simultaneous NLC and PMSE Observations at Syowa, Antarctica
Hosokawa, K; Y. Takeda; A. Kadokura; A. S. Yukimatu; N. Sato
Antarctic Record, National Institute of Polar Research, 57, 317-328, 2014, Peer-reviwed
Research institution, English - Planetary wave oscillations observed in ozone and PMSE data from Antarctica
T. D. Demissie; K. Hosokawa; N. H. Kleinknecht; P. J. Espy; R. E. Hibbins
Journal of Atmospheric and Solar-Terrestrial Physics, 105-106, 105-106, 207-213, Dec. 2013, Peer-reviwed
Scientific journal, English - The interconnection between cross-polar cap convection and the luminosity of polar cap patches
G. W. Perry; J. -P. St-Maurice; K. Hosokawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 118, 11, 7306-7315, Nov. 2013, Peer-reviwed
Scientific journal, English - Relationship between auroral substorm and ion upflow in the nightside polar ionosphere
Y. Ogawa; M. Sawatsubashi; S. C. Buchert; K. Hosokawa; S. Taguchi; S. Nozawa; S. Oyama; T. T. Tsuda; R. Fujii
Journal of Geophysical Research: Space Physics, 118, 11, 7426-7437, Nov. 2013, Peer-reviwed
Scientific journal, English - First observations of polar mesosphere summer echoes by SuperDARN Zhongshan radar
E. X. Liu; H. Q. Hu; K. Hosokawa; R. Y. Liu; Z. S. Wu; Z. Y. Xing
Journal of Atmospheric and Solar-Terrestrial Physics, 104, 104, 39-44, Nov. 2013, Peer-reviwed
Scientific journal, English - Large flow shears around auroral beads at substorm onset
K. Hosokawa; S. E. Milan; M. Lester; A. Kadokura; N. Sato; G. Bjornsson
GEOPHYSICAL RESEARCH LETTERS, 40, 19, 4987-4991, Oct. 2013, Peer-reviwed
Scientific journal, English - Characteristics of medium-scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar
A. Grocott; K. Hosokawa; T. Ishida; M. Lester; S. E. Milan; M. P. Freeman; N. Sato; A. S. Yukimatu
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 118, 9, 5830-5841, Sep. 2013, Peer-reviwed
Scientific journal, English - Steep plasma depletion in dayside polar cap during a CME-driven magnetic storm
J. Sakai; S. Taguchi; K. Hosokawa; Y. Ogawa
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 118, 1, 462-471, 2013, Peer-reviwed
Scientific journal, English - Periodicities of polar cap patches
K. Hosokawa; S. Taguchi; Y. Ogawa; T. Aoki
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 118, 1, 447-453, 2013, Peer-reviwed
Scientific journal, English - トロムソ/ロングイアビンにおけるオーロラ観測用並列イメージャーの大量データ処理と可視化
小川泰信; 門倉昭; 元場哲郞; 田中良昌; 細川敬祐
宇宙科学情報解析論文誌, 2, 51-61, 2013, Peer-reviwed - Processing and visualization of large amounts of auroral data obtained with All-sky/Narrow field-of-view parallel imagers in Tromso and Longyearbyen
Ogawa, Y; A. Kadokura; T. Motoba; Y. Tanaka; K. Hosokawa
Journal of Space Science Informatics Japan, 2, 51-61, 2013, Peer-reviwed - An integrated analysis platform merging SuperDARN data within the THEMIS tool developed by ERG-Science Center (ERG-SC)
Hori T; N. Nishitani; Y. Miyoshi; Y. Miyashita; K. Seki; T. Segawa; K. Hosokawa; A. S. Yukimatu; Y. Tanaka; N. Sato; M. Kunitake; T. Nagatsuma
Adv. Polar. Sci., 24, doi:10.3724/SP.J.1085.2013.000, 2013, Peer-reviwed
Scientific journal, English - Steep plasma depletion in dayside polar cap during a CME-driven magnetic storm
J. Sakai; S. Taguchi; K. Hosokawa; Y. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 118, 1, 462-471, Jan. 2013, Peer-reviwed
Scientific journal, English - Periodicities of polar cap patches
K. Hosokawa; S. Taguchi; Y. Ogawa; T. Aoki
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 118, 1, 447-453, Jan. 2013, Peer-reviwed
Scientific journal, English - Two-dimensional direct imaging of structuring of polar cap patches
K. Hosokawa; S. Taguchi; Y. Ogawa; J. Sakai
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 118, 10, 6536-6543, 2013, Peer-reviwed
Scientific journal, English - Double bursts inside a poleward-moving auroral form in the cusp
S. Taguchi; K. Hosokawa; Y. Ogawa; T. Aoki; M. Taguchi
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 117, doi:10.1029/2012JA018150, Dec. 2012, Peer-reviwed
Scientific journal, English - Space-time variability of polar cap patches: Direct evidence for internal plasma structuring
H. Dahlgren; G. W. Perry; J. L. Semeter; J. -P. St-Maurice; K. Hosokawa; M. J. Nicolls; M. Greffen; K. Shiokawa; C. Heinselman
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 117, doi:10.1029/2012JA017961, Sep. 2012, Peer-reviwed
Scientific journal, English - Simultaneous ground-satellite observations of meso-scale auroral arc undulations
T. Motoba; K. Hosokawa; Y. Ogawa; N. Sato; A. Kadokura; S. E. Milan; M. Lester
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 117, doi:10.1029/2011JA017291, Jun. 2012, Peer-reviwed
Scientific journal, English - GPS total electron content variations associated with poleward moving Sun-aligned arcs
P. T. Jayachandran; K. Hosokawa; K. Shiokawa; Y. Otsuka; C. Watson; S. C. Mushini; J. W. MacDougall; P. Prikryl; R. Chadwick; T. D. Kelly
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 117, doi:10.1029/2011JA017423, May 2012, Peer-reviwed
Scientific journal, English - Magnetic conjugacy of northern and southern auroral beads
Tetsuo Motoba; Keisuke Hosokawa; Akira Kadokura; Natsuo Sato
GEOPHYSICAL RESEARCH LETTERS, 39, doi:10.1029/2012GL051599, Apr. 2012, Peer-reviwed
Scientific journal, English - Direct three-dimensional imaging of polar ionospheric structures with the Resolute Bay Incoherent Scatter Radar
H. Dahlgren; J. L. Semeter; K. Hosokawa; M. J. Nicolls; T. W. Butler; M. G. Johnsen; K. Shiokawa; C. Heinselman
GEOPHYSICAL RESEARCH LETTERS, 39, doi:10.1029/2012GL050895., Mar. 2012, Peer-reviwed
Scientific journal, English - Double bursts inside a poleward-moving auroral form in the cusp
S. Taguchi; K. Hosokawa; Y. Ogawa; T. Aoki; M. Taguchi
Journal of Geophysical Research: Space Physics, 117, 12, 2012, Peer-reviwed
Scientific journal, English - Simultaneous ground-satellite observations of meso-scale auroral arc undulations
T. Motoba; K. Hosokawa; Y. Ogawa; N. Sato; A. Kadokura; S. E. Milan; M. Lester
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 117, 6, 2012, Peer-reviwed
Scientific journal, English - Ground-based aurora conjugacy and dynamic tracing of geomagnetic conjugate points
Sato, N; A. Kadokura; T. Motoba; K. Hosokawa; G. Bjornsson; T. Saemundsson
Geophys Monograph, edited by A. Keiling, E. Donovan, F. Bagenal and T. Karlsson, AGU, Washington, D.C., 91-98, 2012, Peer-reviwed - Signatures of moving polar cap arcs in the F-region PolarDARN echoes
A. V. Koustov; K. Hosokawa; N. Nishitani; K. Shiokawa; H. Liu
ANNALES GEOPHYSICAE, 30, 3, 441-455, 2012, Peer-reviwed
Scientific journal, English - Decay of polar cap patch
K. Hosokawa; J. I. Moen; K. Shiokawa; Y. Otsuka
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 116, doi:10.1029/2010JA016297, May 2011, Peer-reviwed
Scientific journal, English - In situ evidence for interplanetary magnetic field induced tail twisting associated with relative displacement of conjugate auroral features
T. Motoba; K. Hosokawa; Y. Ogawa; N. Sato; A. Kadokura; S. C. Buchert; H. Reme
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 116, doi:10.1029/2010JA016206, Apr. 2011, Peer-reviwed
Scientific journal, English - Midnight sector observations of auroral omega bands
J. A. Wild; E. E. Woodfield; E. Donovan; R. C. Fear; A. Grocott; M. Lester; A. N. Fazakerley; E. Lucek; Y. Khotyaintsev; M. Andre; A. Kadokura; K. Hosokawa; C. Carlson; J. P. McFadden; K. H. Glassmeier; V. Angelopoulos; G. Bjoernsson
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 116, doi:10.1029/2010JA015874, Mar. 2011, Peer-reviwed
Scientific journal, English - Decay of polar cap patch
K. Hosokawa; J. I. Moen; K. Shiokawa; Y. Otsuka
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 116, 5, 2011, Peer-reviwed
Scientific journal, English - In situ evidence for interplanetary magnetic field induced tail twisting associated with relative displacement of conjugate auroral features
T. Motoba; K. Hosokawa; Y. Ogawa; N. Sato; A. Kadokura; S. C. Buchert; H. Réme
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 116, 4, 2011, Peer-reviwed
Scientific journal, English - Motion of polar cap arcs
K. Hosokawa; J. I. Moen; K. Shiokawa; Y. Otsuka
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 116, 1, doi:10.1029/2010JA015906, 2011, Peer-reviwed
Scientific journal, English - A powerful tool for browsing quick-look data in solar-terrestrial physics: "Conjunction Event Finder"
Yukinaga Miyashita; Iku Shinohara; Masaki Fujimoto; Hiroshi Hasegawa; Keisuke Hosokawa; Taku Takada; Tomoaki Hori
EARTH PLANETS AND SPACE, 63, 1, E1-E4, 2011, Peer-reviwed
Scientific journal, English - Propagation of large amplitude ionospheric disturbances with velocity dispersion observed by the SuperDARN Hokkaido radar after the 2011 off the Pacific coast of Tohoku Earthquake
Nozomu Nishitani; Tadahiko Ogawa; Yuichi Otsuka; Keisuke Hosokawa; Tomoaki Hori
EARTH PLANETS AND SPACE, 63, 7, 891-896, 2011, Peer-reviwed
Scientific journal, English - Dynamic temporal evolution of polar cap tongue of ionization during magnetic storm
K. Hosokawa; T. Tsugawa; K. Shiokawa; Y. Otsuka; N. Nishitani; T. Ogawa; M. R. Hairston
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2010JA015848, Dec. 2010, Peer-reviwed
Scientific journal, English - Preonset time sequence of auroral substorms: Coordinated observations by all-sky imagers, satellites, and radars
Y. Nishimura; L. R. Lyons; S. Zou; X. Xing; V. Angelopoulos; S. B. Mende; J. W. Bonnell; D. Larson; U. Auster; T. Hori; N. Nishitani; K. Hosokawa; G. Sofko; M. Nicolls; C. Heinselman
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2010JA015832, Nov. 2010, Peer-reviwed
Scientific journal, English - Plasma flow during the brightening of proton aurora in the cusp
S. Taguchi; K. Hosokawa; S. Suzuki; A. Tawara; H. U. Frey; J. Matzka; A. S. Yukimatu; N. Sato
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, Oct. 2010, Peer-reviwed
Scientific journal, English - Plasma flow during the brightening of proton aurora in the cusp
Taguchi, S; K. Hosokawa; S. Suzuki; A. Tawara; H. U. Frey; J. Matzka; A. S. Yukimatu; N. Sato
J. Geophys. Res., 115, A10308, Oct. 2010, Peer-reviwed, On the basis of simultaneous observations from the Super Dual Auroral Radar Network (SuperDARN), the far ultraviolet instrument on the IMAGE spacecraft, and a magnetometer installed on the east coast of Greenland, we present the characteristics of plasma flow during a westward moving proton aurora in the cusp, observed on 28 July 2000. Data with a time resolution of 12 and 25 s from SuperDARN at Þykkvibær, Iceland, show that the flow having a poleward component, which was accompanied by a quick equatorward expansion of the flow region, occurred in the early stages (approximately 1.5 min) of the brightening. Data from the magnetometer from a ground station on the Greenland east coast, which is located a few hundred kilometers west of the radar's field of view, show perturbations that are consistent with equatorward flow overhead, coincident with the expansion. The presence of flow vectors in opposite directions suggests that vortical flow was present during the proton aurora. Evidence supporting the suggested flow pattern has been found in an event recorded by the Greenland west coast magnetometer chain and in a cusp pass of the DE 2 spacecraft in the literature. We attribute the moving proton aurora to the traveling bulge at the polar cap boundary, which is the footprint of a flux transfer event, and imply that the preexisting vortical flow may be intensified when it becomes inflow to the bulge.
Scientific journal, English - Plasma irregularities adjacent to auroral patches in the postmidnight sector
K. Hosokawa; T. Motoba; A. S. Yukimatu; S. E. Milan; M. Lester; A. Kadokura; N. Sato; G. Bjornsson
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2010JA015319, Sep. 2010, Peer-reviwed
Scientific journal, English - Varying interplanetary magnetic field B-y effects on interhemispheric conjugate auroral features during a weak substorm
T. Motoba; K. Hosokawa; N. Sato; A. Kadokura; G. Bjornsson
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2010JA015369, Sep. 2010, Peer-reviwed
Scientific journal, English - A new SuperDARN high temporal resolution 2-D ionospheric / thermospheric observation with simultaneous optical measurements and its contributions to CAWSES-II
Yukimatu, A. S; K. Hosokawa; T. Motoba; N. Sato; M. Lester
Proc. CAWSES-II Kickoff Symposium in Japan, 103-106, Jul. 2010
International conference proceedings, English - Plasma irregularities in the duskside subauroral ionosphere as observed with midlatitude SuperDARN radar in Hokkaido, Japan
K. Hosokawa; N. Nishitani
RADIO SCIENCE, 45, doi:10.1029/2009RS004244, Jul. 2010, Peer-reviwed
Scientific journal, English - Development of CDF conversion scheme for SDD fitacf files by ERG-Science Center: A new data analysis platform powered by the THEMIS tool
Hori, T; N. Nishitani; Y. Miyashita; Y. Miyoshi; K. Seki; T. Segawa; K. Hosokawa; A. S. Yukimatu; Y. Tanaka; N. Sato; M. Kunitake; T. Nagatsuma
Proc. SuperDARN Workshop 2010 in Hermanus, South Africa, Jun. 2010
International conference proceedings, English - 2-D Electric field modulation with pulsating aurora observed with a new SuperDARN high temporal resolution technique
Yukimatu, A. S; K. Hosokawa; T. Motoba; N. Sato; M. Lester
Proc. SuperDARN Workshop 2010 in Hermanus, South Africa, 3-8-1-3-8-30, Jun. 2010
International conference proceedings, English - Large-scale traveling ionospheric disturbance observed by superDARN Hokkaido HF radar and GPS networks on 15 December 2006
H. Hayashi; N. Nishitani; T. Ogawa; Y. Otsuka; T. Tsugawa; K. Hosokawa; A. Saito
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2009JA014297, Jun. 2010, Peer-reviwed
Scientific journal, English - Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp
S. Taguchi; K. Hosokawa; S. Suzuki; A. S. Yukimatu; N. Sato
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, May 2010, Peer-reviwed
Scientific journal, English - Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp
Taguchi, S; K. Hosokawa; S. Suzuki; A. S. Yukimatu; N. Sato
J. Geophys. Res., 115, A05305, May 2010, Peer-reviwed, In this study, we report evidence proving the existence of a close relationship between the initial development of a poleward propagating feature of the HF radar backscatter, that is, HF radar polar patch, and a fast azimuthal flow in the cusp. We focus on two events in which the HF radar polar patch was formed and was identified by the Super Dual Auroral Radar Network radars at Saskatoon, Canada, and Prince George, Canada, on 27 March 2001. We examine their spatial and temporal development. The two events occurred at the interface between the interplanetary magnetic field (IMF) BY-controlled azimuthal flow and the antisunward flow typical of a negative IMF BZ; they developed in a longitudinally asymmetric manner. The increase in ∣BY/BZ∣ when BZ was negative triggered the fast azimuthal flow. We interpret the temporal and spatial development of the HF radar polar patch in terms of the plasma density gradient created by the azimuthal flow and in terms of the subsequent development of the gradient in the direction of both the azimuthal flow and the antisunward flow.
Scientific journal, English - Dynamic temporal evolution of polar cap tongue of ionization during magnetic storm
K. Hosokawa; T. Tsugawa; K. Shiokawa; Y. Otsuka; N. Nishitani; T. Ogawa; M. R. Hairston
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 115, 12, 2010, Peer-reviwed
Scientific journal, English - Plasma irregularities adjacent to auroral patches in the postmidnight sector
K. Hosokawa; T. Motoba; A. S. Yukimatu; S. E. Milan; M. Lester; A. Kadokura; N. Sato; G. Bjornsson
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 115, 9, 2010, Peer-reviwed
Scientific journal, English - Reorganization of polar cap patches through shears in the background plasma convection
K. Hosokawa; J. -P. St-Maurice; G. J. Sofko; K. Shiokawa; Y. Otsuka; T. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 115, doi:10.1029/2009JA014599, Jan. 2010, Peer-reviwed
Scientific journal, English - Modulation of ionospheric conductance and electric field associated with pulsating aurora
K. Hosokawa; Y. Ogawa; A. Kadokura; H. Miyaoka; N. Sato N.
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 115, 3, doi:10.1029/2009JA014683, 2010, Peer-reviwed
Scientific journal, English - Initial development of the HF radar polar patch driven by the azimuthal flow burst in the cusp
Taguchi S; K. Hosokawa; S. Suzuki; A. S. Yukimatu; N. Sato
Journal of Geophysical Research, 115, doi:10.1029/2009JA014631, 2010, Peer-reviwed
Scientific journal, English - Pedersen current carried by electrons in auroral D-region
Hosokawa, K; Y. Ogawa
Geophysical Research Letters, 37, doi:10.1029/2010GL044746, 2010, Peer-reviwed
Scientific journal, English - Distorted flow during moving mesoscale plasma precipitation in the cusp
Taguchi, S; K. Hosokawa; S. Suzuki; A. Tawara; H. U. Frey; J. Mazka; A. S. Yukimatu; N. Sato
Journal of Geophysical Research, 115, doi:10.1029/2010JA015535, 2010, Peer-reviwed
Scientific journal, English - GPS total electron content variations associated with a polar cap arc
P. T. Jayachandran; K. Hosokawa; J. W. MacDougall; S. Mushini; R. B. Langley; K. Shiokawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2009JA014916, Dec. 2009, Peer-reviwed
Scientific journal, English - Ion heating in high-speed flow channel within the duskside cell of the polar cap ion convection under large IMF-B-y condition
Sawako Maeda; Yasunobu Ogawa; Keisuke Hosokawa; Satonori Nozawa; Shin-ichiro Oyama; Takuo Tsuda; Asgeir Brekke
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2009JA014300, Nov. 2009, Peer-reviwed
Scientific journal, English - Coordinated observations of nighttime medium-scale traveling ionospheric disturbances in 630-nm airglow and HF radar echoes at midlatitudes
S. Suzuki; K. Hosokawa; Y. Otsuka; K. Shiokawa; T. Ogawa; N. Nishitani; T. F. Shibata; A. V. Koustov; B. M. Shevtsov
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA013963, Jul. 2009, Peer-reviwed
Scientific journal, English - Moving mesoscale plasma precipitation in the cusp
S. Taguchi; S. Suzuki; K. Hosokawa; Y. Ogawa; A. S. Yukimatu; N. Sato; M. R. Collier; T. E. Moore
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 114, 6, 01 Jun. 2009, Peer-reviwed
Scientific journal, English - Simultaneous observations of visible NLC and SuperDARN-PMSE over Japanese Syowa station in Antarctica
Sato, N; K. Hosokawa; Y. Takeda; T. Ogawa; A. S. Yukimatu; A. Kadokura; M. Tsutsumi
Proc. SuperDARN Workshop 2009 in Corsica, Jun. 2009
International conference proceedings, English - Small-scale converging electric field structure in the vicinity of breakup auroral arcs
Hosokawa, K; R. Sugita; A. Kadokura; A. S. Yukimatu; N. Sato; S. E. Milan; M. Lester; G. Bjornsson; T. Saemundsson
Proc. SuperDARN Workshop 2009 in Corsica, Jun. 2009
International conference proceedings, English - Moving mesoscale plasma precipitation in the cusp
S. Taguchi; S. Suzuki; K. Hosokawa; Y. Ogawa; A. S. Yukimatu; N. Sato; M. R. Collier; T. E. Moore
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2009JA014128, Jun. 2009, Peer-reviwed
Scientific journal, English - Acceleration mechanism of high-speed neutral wind observed in the polar lower thermosphere
T. T. Tsuda; S. Nozawa; S. Oyama; T. Motoba; Y. Ogawa; H. Shinagawa; N. Nishitani; K. Hosokawa; N. Sato; M. Lester; R. Fujii
Journal of Geophysical Research: Space Physics, 114, 4, doi:10.1029/2008JA013867, Apr. 2009, Peer-reviwed
Scientific journal, English - Motion of polar cap patches: A statistical study with all-sky airglow imager at Resolute Bay, Canada
K. Hosokawa; T. Kashimoto; S. Suzuki; K. Shiokawa; Y. Otsuka; T. Ogawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA014020, Apr. 2009, Peer-reviwed
Scientific journal, English - Unusually elongated, bright airglow plume in the polar cap F region: Is it a tongue of ionization?
K. Hosokawa; T. Tsugawa; K. Shiokawa; Y. Otsuka; T. Ogawa; M. R. Hairston
GEOPHYSICAL RESEARCH LETTERS, 36, doi:10.1029/2009GL037512, Apr. 2009, Peer-reviwed
Scientific journal, English - Medium-scale traveling ionospheric disturbances observed with the SuperDARN Hokkaido radar, all-sky imager, and GPS network and their relation to concurrent sporadic E irregularities
T. Ogawa; N. Nishitani; Y. Otsuka; K. Shiokawa; T. Tsugawa; K. Hosokawa
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 114, 3, 01 Mar. 2009, Peer-reviwed
Scientific journal, English - Relationship between polar cap patches and field-aligned irregularities as observed with an all-sky airglow imager at Resolute Bay and the PolarDARN radar at Rankin Inlet
K. Hosokawa; K. Shiokawa; Y. Otsuka; T. Ogawa; J. -P. St-Maurice; G. J. Sofko; D. A. Andre
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA013707, Mar. 2009, Peer-reviwed
Scientific journal, English - Medium-scale traveling ionospheric disturbances observed with the SuperDARN Hokkaido radar, all-sky imager, and GPS network and their relation to concurrent sporadic E irregularities
T. Ogawa; N. Nishitani; Y. Otsuka; K. Shiokawa; T. Tsugawa; K. Hosokawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA013893, Mar. 2009, Peer-reviwed
Scientific journal, English - HF radar polar patch and its relation with the cusp during By -dominated IMF: Simultaneous observations at two altitudes
S. Taguchi; K. Hosokawa; A. Nakao; M. R. Collier; T. E. Moore; N. Sato; A. S. Yukimatu
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 114, 2, 01 Feb. 2009, Peer-reviwed
Scientific journal, English - HF radar polar patch and its relation with the cusp during B-Y-dominated IMF: Simultaneous observations at two altitudes
S. Taguchi; K. Hosokawa; A. Nakao; M. R. Collier; T. E. Moore; N. Sato; A. S. Yukimatu
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA013624, Feb. 2009, Peer-reviwed
Scientific journal, English - The Optical Mesosphere Thermosphere Imagers (OMTIs) for network measurements of aurora and airglow
K. Shiokawa; K. Hosokawa; K. Sakaguchi; A. Ieda; Y. Otsuka; T. Ogawa; M. Connors
FUTURE PERSPECTIVES OF SPACE PLASMA AND PARTICLE INSTRUMENTATION AND INTERNATIONAL COLLABORATIONS, 1144, 212-+, 2009, Peer-reviwed
International conference proceedings, English - Dynamical property of storm time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere
Y. Ebihara; N. Nishitani; T. Kikuchi; T. Ogawa; K. Hosokawa; M. C. Fok; M. F. Thomsen
Journal of Geophysical Research: Space Physics, 114, Jan. 2009 - Dynamical property of SAPS as a manifestation of fine structures of the ring current during the magnetic storm of 15 December 2006
Ebihara, Y; N Nishitani; T. Kikuchi; T. Ogawa; K. Hosokawa; M.-C. Fok; M. F. Thomsen
Journal of Geophysical Reseach, 114, doi:10.1029/2008JA013614, 2009, Peer-reviwed
Scientific journal, English - Statistical characteristics of polar cap mesospheric gravity waves observed by an all-sky airglow imager at Resolute Bay, Canada
S. Suzuki; K. Shiokawa; K. Hosokawa; K. Nakamura; W. K. Hocking
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 114, doi:10.1029/2008JA013652, Jan. 2009, Peer-reviwed
Scientific journal, English - SuperDARN Hokkaido radar observation of westward flow enhancement in subauroral latitudes
R. Kataoka; K. Hosokawa; N. Nishitani; Y. Miyoshi
Annales Geophysicae, 27, 4, 1695-1699, 2009, Peer-reviwed
Scientific journal, English - Response of large-scale ionospheric convection to substorm expansion onsets: A case study
Y. Miyashita; K. Hosokawa; T. Hori; Y. Kamide; A. S. Yukimatu; M. Fujimoto; T. Mukai; S. Machida; N. Sato; Y. Saito; I. Shinohara; J. B. Sigwarth
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 113, A12, doi:10.1029/2008JA013586, Dec. 2008, Peer-reviwed
Scientific journal, English - Electric field modulation behind pulsating aurora
K. Hosokawa; A. Kadokura; N. Sato; S. E. Milan; M. Lester; G. Bjornsson; Th. Saemundsson
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 113, A11, doi:10.1029/2008JA013601, Nov. 2008, Peer-reviwed
Scientific journal, English - Estimation of magnetopause motion from low-energy neutral atom emission
K. Hosokawa; S. Taguchi; S. Suzuki; M. R. Collier; T. E. Moore; M. F. Thomsen
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 113, 10, 01 Oct. 2008, Peer-reviwed
Scientific journal, English - Estimation of magnetopause motion from low-energy neutral atom emission
K. Hosokawa; S. Taguchi; S. Suzuki; M. R. Collier; T. E. Moore; M. F. Thomsen
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 113, A10, doi:10.1029/2008JA013124, Oct. 2008, Peer-reviwed
Scientific journal, English - SuperDARN observations of daytime MSTIDs in the auroral and mid-latitudes: Possibility of long-distance propagation
T. Ishida; K. Hosokawa; T. Shibata; S. Suzuki; N. Nishitani; T. Ogawa
GEOPHYSICAL RESEARCH LETTERS, 35, 13, doi:10.1029/2008GL034623, Jul. 2008, Peer-reviwed
Scientific journal, English - Conjugate observations of ENA signals in the high-altitude cusp and proton auroral spot in the low-altitude cusp with IMAGE spacecraft
S. Suzuki; S. Taguchi; K. Hosokawa; M. R. Collier; T. E. Moore; H. U. Frey; S. B. Mende
GEOPHYSICAL RESEARCH LETTERS, 35, 13, doi:10.1029/2008GL034543, Jul. 2008, Peer-reviwed
Scientific journal, English - Two-dimensional observations of overshielding during a magnetic storm by the Super Dual Auroral Radar Network (SuperDARN) Hokkaido radar
Y. Ebihara; N. Nishitani; T. Kikuchi; T. Ogawa; K. Hosokawa; M. -C. Fok
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 113, A1, doi:10.1029/2007JA012641, Jan. 2008, Peer-reviwed
Scientific journal, English - D region HF radar echoes associated with energetic particle precipitation and pulsating aurora
S. E. Milan; K. Hosokawa; M. Lester; N. Sato; H. Yamagishi; F. Honary
ANNALES GEOPHYSICAE, 26, 7, 1897-1904, 2008, Peer-reviwed
Scientific journal, English - Rankin Inlet PolarDARN radar observations of duskward moving Sun-aligned optical forms
A. Koustov; K. Hosokawa; N. Nishitani; T. Ogawa; K. Shiokawa
ANNALES GEOPHYSICAE, 26, 9, 2711-2723, 2008, Peer-reviwed
Scientific journal, English - Correlative variations of the neutral atom emission in the high-altitude cusp and the fast anti-sunward convection in the low-altitude cusp
Y. Murata; S. Taguchi; K. Hosokawa; A. Nakao; M. R. Collier; T. E. Moore; N. Sato; H. Yamagishi; A. S. Yukimatu
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 112, 11, 01 Nov. 2007, Peer-reviwed
Scientific journal, English - Correlative variations of the neutral atom emission in the high-altitude cusp and the fast anti-sunward convection in the low-altitude cusp
Y. Murata; S. Taguchi; K. Hosokawa; A. Nakao; M. R. Collier; T. E. Moore; N. Sato; H. Yamagishi; A. S. Yukimatu
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 112, A11, doi:10.1029/2007JA012404, Nov. 2007, Peer-reviwed
Scientific journal, English - Dynamic variations of a convection flow reversal in the subauroral postmidnight sector as seen by the SuperDARN Hokkaido HF radar
Ryuho Kataoka; Nozomu Nishitani; Yusuke Ebihara; Keisuke Hosokawa; Tadahiko Ogawa; Takashi Kikuchi; Yoshizumi Miyoshi
GEOPHYSICAL RESEARCH LETTERS, 34, 21, doi:10.1029/2007GL031552, Nov. 2007, Peer-reviwed
Scientific journal, English - Storm phase dependence of ion outflow: Statistical signatures obtained by IMAGE/LENA
T. Kunori; M. Nose; S. Taguchi; K. Hosokawa; M. R. Collier; T. E. Moore
GEOPHYSICAL RESEARCH LETTERS, 34, 18, doi:10.1029/2007GL029877, Sep. 2007, Peer-reviwed
Scientific journal, English - Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations
H. Fujiwara; R. Kataoka; M. Suzuki; S. Maeda; S. Nozawa; K. Hosokawa; H. Fukunishi; N. Sato; M. Lester
ANNALES GEOPHYSICAE, 25, 11, 2393-2403, 2007, Peer-reviwed
Scientific journal, English - Estimating drift velocity of polar cap patches with all-sky airglow imager at Resolute Bay, Canada
K. Hosokawa; K. Shiokawa; Y. Otsuka; A. Nakajima; T. Ogawa; J. D. Kelly
GEOPHYSICAL RESEARCH LETTERS, 33, 15, doi:10.1029/2006GL026916, Aug. 2006, Peer-reviwed
Scientific journal, English - Neutral atom emission in the direction of the high-latitude magnetopause for northward IMF: Simultaneous observations from IMAGE spacecraft and SuperDARN radar
S Taguchi; K Hosokawa; A Nakao; MR Collier; TE Moore; A Yamazaki; N Sato; AS Yukimatu
GEOPHYSICAL RESEARCH LETTERS, 33, 3, doi:10.1029/2005GL025020, Feb. 2006, Peer-reviwed
Scientific journal, English - Simultaneous observations of ions of ionospheric orgin over the ionosphere and in the plasma sheet at storm-time substorms
Nosé, M; T. Kunori; Y. Ono; S. Taguchi; K. Hosokawa; T. E. Moore; M. R. Collier; S. P. Christon; E. W. McEntire
Proceedings of the Eighth International Conference on Substorms, 203-208, 2006
International conference proceedings - Neutral atom emission coming from the direction of the high-latitude magnetopause under northward IMF
Taguchi, S; K. Hosokawa; Y. Murata; A. Nakao; M. R. Collier; T. E. Moore; A. Yamazaki; N. Sato; A. S. Yukimatu
Advances in Polar Upper Atmospheric Research, National Institute of Polar Research, 20, 17-26, 2006, Peer-reviwed, The Low Energy Neutral Atom (LENA) imager on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft in the magnetosphere can detect neutral particles coming from the direction of the magnetopause. During a period of dynamic pressure of 〜6 nPa and IMF B_Z of 〜15nT on March 27, 2001, significant neutral atom emissions occurred in the direction of the very high-latitude magnetopause. Simultaneous observations from IMAGE/LENA and SuperDARN radar show that the LENA emission appears concurrently with the enhancement of the sunward flow of the reverse convection in the ionosphere. In a recent paper (S. Taguchi et al., Geophys. Res. Lett., 33, L03101, doi: 10.1029/2005GL025020, 2006) this type of emission has been interpreted as being produced by the fast ion flow caused by cusp reconnection through charge exchange with the Earth's hydrogen exosphere. In other words, remote sensing using LENA imager can be applied in order to determine the stability of the reconnection site. From results of analyses of LENA emission data we show that the reconnection "spot" mapped on a sphere having a radius of 8 R_E shifts tailward by approximately 1 R_E over 10min while fluctuating.
Scientific journal, English - Monitoring the high-altitude cusp with the Low Energy Neutral Atom imager: Simultaneous observations from IMAGE and Polar
S Taguchi; SH Chen; MR Collier; TE Moore; MC Fok; K Hosokawa; A Nakao
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 110, A12, doi:10.1029/2005JA011075, Dec. 2005, Peer-reviwed
Scientific journal, English - Overwhelming O+ contribution to the plasma sheet energy density during the October 2003 superstorm: Geotail/EPIC and IMAGE/LENA observations
M Nose; S Taguchi; K Hosokawa; SP Christon; RW McEntire; TE Moore; MR Collier
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 110, A9, doi:10.1029/2004JA010930, Aug. 2005, Peer-reviwed
Scientific journal, English - Extraction of polar mesosphere summer echoes from SuperDARN data
K Hosokawa; T Ogawa; NF Arnold; M Lester; N Sato; AS Yukimatu
GEOPHYSICAL RESEARCH LETTERS, 32, 12, doi:10.1029/2005GL022788, Jun. 2005, Peer-reviwed
Scientific journal, English - Monitoring the high-altitude cusp with the low energy neutral atom imager: Simultaneous observations from IMAGE and polar
S. Taguchi; S. H. Chen; M. R. Collier; T. E. Moore; M. C. Fok; K. Hosokawa; A. Nakao
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 110, 12, 2005, Peer-reviwed
Scientific journal, English - On the relationship between spectral characteristics of high-latitude irregularities and small-scale electromagnetic field fluctuations
Hosokawa, K; S. Yamashita; P. Stauning; A. S. Yukimatu; N. Sato; T. Iyemori
Proc. SuperDARN workshop 2004 in Saskatoon, Canada, May 2004
International conference proceedings, English - Statistical analysis of backscatters from first range gates with SENSU Syowa East and CUTLASS Iceland East - an attenmpt to estimate interhemispheric asymmetry in PMSE activities -
Hosokawa, K; T. Ogawa; N. F. Arnold; M. Lester; A. S. Yukimatu; N. Sato
Proc. SuperDARN workshop 2004 in Saskatoon, Canada, May 2004
International conference proceedings, English - Poleward-moving patch of neutral atoms as observed by the IMAGE spacecraft Low Energy Neutral Atom (LENA) imager - manifestation of transient dayside reconnection? -
Hosokawa, K; S. Taguchi; A. Nakano; M. R. Collier; T. E. Moore; M. Lester; A. S. Yukimatu; N. Sato
Proc. SuperDARN workshop 2004 in Saskatoon, Canada, May 2004
International conference proceedings, English - Origin of the SuperDARN broad Doppler spectra: First observational evidence from Oersted satellite magnetometer
Hosokawa, K; S. Yamashita; P. Stauning; N. Sato; A. S. Yukimatu; T. Iyemori
Annales Geophysicae, 22, doi:10.5194/angeo-22-159-2004, 2004, Peer-reviwed
Scientific journal, English - Origin of the SuperDARN broad Doppler spectra: simultaneous observation with Oersted satellite magnetometer
K. Hosokawa; S. Yamashita; P. Stauning; N. Sato; A. S. Yukimatu; T. Iyemori
Ann. Geophys., 22, 1, 159-168, Jan. 2004, Peer-reviwed, We perform a case study of a favorable conjunction of an overpass of the Oersted satellite with the field-of-view of the SuperDARN Syowa East radar during an interval of the southward IMF Bz. At the time, the radar observed an L-shell aligned boundary in the spectral width around the dayside ionosphere. Simultaneously, high-frequency (0.2–5Hz) magnetic field fluctuations were observed by the Oersted satellite's high-time resolution magnetometer. These magnetic field fluctuations are considered to be Alfvén waves possibly associated with the particle which precipitates into the dayside high-latitude ionosphere when magnetic reconnection occurs. It has been theoretically predicted that the time-varying electric field is the dominant physical process to expand the broad HF radar Doppler spectra. Our observation clearly demonstrates that the boundary between narrow and broad spectral widths is corresponding well to the boundary in the level of the fluctuations, which supports the previous theoretical prediction. A close relationship between electric and magnetic field fluctuations and particle precipitations during southward IMF conditions has been confirmed by many authors. The present observation allows us to suggest that the boundary between narrow and broad Doppler spectral widths observed in the dayside ionosphere is connected with the signature of the open/closed field line boundary, such as the cusp particle precipitations via electric and magnetic field fluctuations for the case of the negative IMF Bz conditions.
Scientific journal, English - Origin of the SuperDARN broad Doppler spectra: simultaneous observation with Oersted satellite magnetometer
K Hosokawa; S Yamashita; P Stauning; N Sato; AS Yukimatu; T Iyemori
ANNALES GEOPHYSICAE, 22, 1, 159-168, 2004, Peer-reviwed
Scientific journal, English - Statistics of antarctic mesospheric echoes observed with the SuperDARN Syowa Radar
K Hosokawa; T Ogawa; AS Yukimatu; N Sato; T Iyemori
GEOPHYSICAL RESEARCH LETTERS, 31, 2, doi:10.1029/2003GL018776, Jan. 2004, Peer-reviwed
Scientific journal, English - Simultaneous observations of the cusp with IMAGE Low Energy Neutral Atoms Imager and SuperDARN radar
Taguchi, S; K. Hosokawa; M. R. Collier; M.-C. Fok; A. S. Yukimatu; N. Sato; R. A. Greenwald
Advances in Polar Upper Atmospheric Research, 18, 53-64, 2004, Peer-reviwed, The Low Energy Neutral Atom (LENA) imager on the IMAGE spacecraft observed significant emission in the high-latitude magnetosheath direction during an extreme solar wind condition on April 11, 2001. The emission was modulated in such a manner that the sources shifted equatorward in the high-latitude sheath while sometimes undergoing brief poleward returns. This modulation and the IMF BZ tend to have correlative variations. During this interval of interest, SuperDARN was receiving strong backscattered signals from large potions of the dayside ionosphere. This observation indicates that the equatorward motion of the cusp latitude consists of rapid and slow phases. This kind of equatorward shift appears to correlate with the motion of the emission observed by LENA in the direction of the high-latitude sheath, which gives evidence for a means for monitoring the high-altitude cusp using IMAGE/LENA. It thus appears that the two remote sensing observations, i.e., IMAGE/LENA and SuperDARN radar would provide promising opportunities to understand the detailed dynamics of the polar cusp extending from the low-altitudes to the high-altitudes.
Scientific journal, English - A numerical simulation of the geomagnetic sudden commencement: 1. Generation of the field-aligned current associated with the preliminary impulse
S Fujita; T Tanaka; T Kikuchi; K Fujimoto; K Hosokawa; M Itonaga
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 108, A12, doi:10.1029/2002JA009407, Dec. 2003, Peer-reviwed
Scientific journal, English - Interhemispheric comparison of spectral width boundary as observed by SuperDARN radars
K Hosokawa; EE Woodfield; M Lester; SE Milan; N Sato; AS Yukimatu; T Iyemori
ANNALES GEOPHYSICAE, 21, 7, 1553-1565, Jul. 2003, Peer-reviwed
Scientific journal, English - Transient production of F-region irregularities associated with TCV passage
R Kataoka; H Fukunishi; K Hosokawa; H Fujiwara; AS Yukimatu; N Sato; YK Tung
ANNALES GEOPHYSICAE, 21, 7, 1531-1541, Jul. 2003, Peer-reviwed
Scientific journal, English - Characteristics of polar mesosphere summer echoes observed with the Syowa Station HF radars
Ogawa, T; K. Hosokawa; N. Nishitani; N. Sato; H. Yamagishi; A. S. Yukimatu
Advances in Polar Upper Atmospheric Research, 17, 13-29, 2003, Peer-reviwed, Polar mesosphere summer echoes(PMSE) are strong VHF-UHF radar echoes from the high-latitude cold mesopause at around 80-90km altitudes in summer. Although a number of in situ and radar observations of PMSE have been made until now, generation mechanisms of PMSE and scattering processes of radar waves due to PMSE-associated irregularities are still controversial. In this paper, PMSE detected for the first time in December 1997 and January 1998 with the oblique incidence SuperDARN HF radars at Syowa Station, Antarctica(69.0°S , 39.6°E ), are summarized to reveal the characteristics of PMSE at HF band. They appear at slant ranges of 180-315km with elevation angles of 15°-30° between 1030 and 1230UT or between 2100 and 0140UT, and are characterized by durations of 65-110min with intermittent subsidence and quasi-periodic oscillations of echo power with periods of 5-20min, due to short-period atmospheric gravity waves. Detailed analysis of the December 15, 1997 event reveals the followings: 1) echo power is less than 30dB, Doppler velocity between -40 and +40m/s, and spectral width less than 50m/s, respectively, 2) there exists no particular correlation among power, velocity and width, and 3) PMSE occurrence can be related to eastward neutral wind due to semi-diurnal tide that may induce the decrease in the mesospheric temperature.
Scientific journal, English - Simultaneous measurement of duskside subauroral irregularities from the CUTLASS Finland radar and EISCAT UHF system
K Hosokawa; M Sugino; M Lester; N Sato; AS Yukimatu; T Iyemori
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 107, A12, doi:10.1029/2002JA009494, Dec. 2002, Peer-reviwed
Scientific journal, English - An inter-hemispheric, statistical study of nightside spectral width distributions from coherent HF scatter radars
EE Woodfield; K Hosokawa; SE Milan; N Sato; M Lester
ANNALES GEOPHYSICAE, 20, 12, 1921-1934, Dec. 2002, Peer-reviwed
Scientific journal, English - Statistical characteristics of Doppler spectral width as observed by the conjugate SuperDARN radars
K Hosokawa; EE Woodfield; M Lester; SE Milan; N Sato; AS Yukimatu; T Iyemori
ANNALES GEOPHYSICAE, 20, 8, 1213-1223, Aug. 2002, Peer-reviwed
Scientific journal, English - SuperDARN HF Radar Signatures of Traveling Convection Vortices
Kataoka, R; H. Fukunishi; A. S. Yukimatu; N. Sato; K. Hosokawa; SuperDARN PIs
Proc. SuperDARN workshop 2002, 2.12.1-2.12.30, May 2002
International conference proceedings, English - Simultaneous measurement of duskside subauroral irregularities from the CUTLASS Finland radar and EISCAT UHF system
K. Hosokawa; M. Sugino; M. Lester; N. Sato; A. S. Yukimatu; T. Iyemori
Journal of Geophysical Research: Space Physics, Blackwell Publishing Ltd, 107, 12, 2002, Peer-reviwed
Scientific journal, English - Source of field-aligned irregularities in the subauroral F region as observed by the SuperDARN radars
K Hosokawa; T Iyemori; AS Yukimatu; N Sato
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 106, A11, 24713-24731, Nov. 2001, Peer-reviwed
Scientific journal, English - Source of plasma irregularities in the subauroral F region as observed by the SuperDARN radars
Hosokawa, K; T. Iyemori; A. S. Yukimatu; N. Sato; M. Sugino
Proc. 2001 Asia Pacific-Radio Science Conference, p.346, 2001 - Spatial distribution of irregularity occurrence rate in the subauroral F region as observed by the SuperDARN radars
Hosokawa, K; T. Iyemori; A. S. Yukimatu; N. Sato
Proc. CRL "Alaska Project" HF radar Working Group meeting, pp.47-59, 2000 - Characteristics of solar flare effect in the high-latitude ionosphere as observed by the SuperDARN radars
Hosokawa, K; T. Iyemori; A. S. Yukimatu; N. Sato
Advances in Polar Upper Atmosphere Research, 14, 66-75, 2000, Peer-reviwed, Sudden perturbations of the ground magnetic fields at solar flares are called geomagnetic Solar Flare Effect (SFE). An SFE is the extra ionization produced by the X-ray emission from a solar flare. We analyzed 10 intense SFE events from 1996 to 1998 using SuperDARN HF radar network and other instruments located in the northern hemisphere. Two typical ionospheric signatures associated with the solar flares are revealed, one is a sudden fade-out of backscatter echoes, and the other is an appearance or variation of field-aligned irregularities. Sudden fade-out is observed only in the sunlit hemisphere, and the appearance or variation of irregularities are observed only near the terminator. In addition, we investigated one event out of ten in detail and found that there exists a discontinuity of the electric field or conductivity around the irregularity. This fact suggests that the variation of conductivity or electric field in the E region could affect the irregularity formation in the F region.
Scientific journal, English
MISC
- HFドップラー観測とGPS電波掩蔽観測を用いた台風に関連する電離圏擾乱の解析
榎本陸登; 中田裕之; 細川敬祐; 大矢浩代
2024, 大気電気学会誌(Web), 18, 1, 1882-0549, 202402249584346959 - Es層形成過程の中性大気とプラズマ大気の同時観測による解明 S-310-46号機プロジェクト—Elucidation of the generation process of sporadic E layers by simultaneous observation of the neutral and ionized atmospheres: S-310-46 rocket project
齊藤, 昭則; 松岡, 彩子; 坂崎, 貴俊; 阿部, 琢美; 齋藤, 義文; 石坂, 圭吾; 田川, 雅人; 横田, 久美子; 熊本, 篤志; 小嶋, 浩嗣; 栗田, 怜; 横山, 竜宏; 村田, 直史; 斎藤, 享; 高橋, 透; 西岡, 未知; 細川, 敬祐; 中田, 裕之; Huixin, Liu; 木暮, 優; 西山, 尚典; SAITO, Akinori; MATSUOKA, Ayako; SAKAZAKI, Takatoshi; ABE, Takumi; SAITO, Yoshifumi; ISHISAKA, Keigo; TAGAWA, Masahito; YOKOTA, Kumiko; KUMAMOTO, Atsushi; KOJIMA, Hirotsugu; KURITA, Satoshi; YOKOYAMA, Tatsuhiro; MURATA, Naofumi; SAITO, Susumu; TAKAHASHI, Toru; NISHIOKA, Michi; HOSOKAWA, Keisuke; NAKATA, Hiroyuki; HUIXIN, Liu; KOGURE, Masaru; NISHIYAMA, Takanori
第5回観測ロケットシンポジウム(2023年2月28日-3月1日. オンライン開催)
5th Sounding Rocket Symposium(February 28-March 1, 2023. Online Meeting)
著者人数: 21名
資料番号: SA6000185020
レポート番号: Ⅲ-5, 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Mar. 2023, 観測ロケットシンポジウム2022 講演集 = Proceedings of Sounding Rocket Symposium 2022, Japanese - “Catapiller-like“ ULF waves detected by SuperDARN during SuperDARN-Arase conjunctions in Fall 2022
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清水紘平; 中田裕之; 細川敬祐; 大矢浩代
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榎本陸登; 中田裕之; SONG Rui; 服部克巳; 細川敬祐; 大矢浩代
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齋藤広樹; 中田裕之; 大矢浩代; 細川敬祐
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佐藤駿; 中田裕之; 穂積Kornyanat; 斎藤享; 細川敬祐; 大矢浩代
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清水紘平; 中田裕之; 細川敬祐; 大矢浩代
2023, 大気電気学会誌(Web), 17, 1, 1882-0549, 202302296746799917 - Analysis of Traveling Ionospheric Disturbances associated with typhoons using HF Doppler and GPS radio occultation observations.
榎本陸登; 中田裕之; 細川敬祐; 大矢浩代
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清水紘平; 中田裕之; 細川敬祐; 大矢浩代
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第4回観測ロケットシンポジウム（2022年3月14-15日. ハイブリッド開催（JAXA相模原キャンパス& オンライン）)
4th Sounding Rocket Symposium(March 14-15, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
著者人数: 17名
資料番号: SA6000175003
レポート番号: Ⅰ-3, 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Mar. 2022, 観測ロケットシンポジウム2021 講演集 = Proceedings of Sounding Rocket Symposium 2021, Japanese - DOI minting and data citation promoted by ISEE
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齋藤広樹; 中田裕之; 大矢浩代; 細川敬祐
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堀切友晃; 中田裕之; 大矢浩代; 細川敬祐
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遠山航平; 三好由純; 栗田怜; 細川敬祐; 小川泰信; 大山伸一郎; 野澤悟徳
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田口 聡; 細川 敬祐; 小川 泰信; 家田 章正
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長房勇之介; 田口聡; 小川泰信; 細川敬祐
2019, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 146th, 201902267197432525 - 半球視野の中間エネルギー電子検出器の開発とPARM(Pulsating AuRora and Microburst)ミッションにおける飛行試験
菅生真; 川島桜也; 浅村和史; 野村麗子; 小川泰信; 細川敬祐; 三好由純; 三谷烈史; 滑川拓; 滑川拓; 坂野井健; 吹澤瑞貴; 八木直志; 笠原慧
2019, 日本地球惑星科学連合大会予稿集(Web), 2019, ROMBUNNO.PEM11‐P24 (WEB ONLY), Japanese, 201902215532531918 - Multiple electron precipitation spots in the cusp and subsequent equatorward expansion of aurora beyond the cusp
Taguchi, Satoshi; Kohei Takasu; Keisuke Hosokawa; Yasunobu Ogawa
Nov. 2018, 第144回地球電磁気・地球惑星圏学会講演集, R006-19 - Red line aurora in the dayside cusp for northward IMF
TAGUCHI S; Y. ODA; K. HOSOKAWA
May 2018, 日本地球惑星科学連合2018年大会講演集, PEM15-02 - 北向きIMF時のカスプ電子オーロラの太陽風速度依存性
田口聡; 織田優心; 細川敬祐
Mar. 2018, 磁気圏ダイナミクス研究集会 - 2波長観測による脈動オーロラの降下電子エネルギー推定
浅野貴紀; 三好由純; 栗田怜; 大山伸一郎; 町田忍; 細川敬祐; 小川泰信
2018, 日本地球惑星科学連合大会予稿集(Web), 2018, 201802223419645226 - 脈動オーロラ消光時に見られる発光強度の極端減少の原因
岸山泰輝; 細川敬祐; 野澤悟徳; 小川泰信; 大山伸一郎; 三好由純; 藤井良一; 笠原禎也; 尾崎光紀; 松田昇也; 篠原育
2018, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 144th, ROMBUNNO.S001‐P14 (WEB ONLY), Japanese, 201902288257137815 - 動くメソスケールカスプオーロラに伴うプラズマ速度プロファイル
長房勇之介; 田口聡; 小川泰信; 細川敬祐
2018, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 144th, ROMBUNNO.R006‐P12 (WEB ONLY), Japanese, 201902216491023241 - 石垣島で取得された630.0nm大気光観測データを用いたプラズマバブルの形状解析
高見晃平; 細川敬祐; 斎藤享; 小川泰信; 塩川和夫; 大塚雄一
2018, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 144th, ROMBUNNO.R005‐P10 (WEB ONLY), Japanese, 201902278246040709 - Spatiotemporal variations of the electron precipitation producing moving cusp aurora
TAGUCHI S; K. HOSOKAWA; Y. OGAWA
May 2017, 日本地球惑星科学連合2017年大会講演集, PEM14-17 - 巨大な動くカスプオーロラのEISCAT観測
田口 聡; 細川 敬祐; 小川 泰信
Feb. 2017, 2016年度EISCAT研究集会 - 複数波長観測による脈動オーロラ降下電子のエネルギー推定とそのMLT依存性
浅野貴紀; 三好由純; 栗田怜; 大山伸一郎; 町田忍; 藤井良一; 細川敬祐; 小川泰信
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, 201802211411065862 - 北欧全天カメラとVan Allen Probes衛星を用いた脈動オーロラ同時観測事例の解析
川村豪; 細川敬祐; 栗田怜; 大山伸一郎; 三好由純; 小川泰信; 藤井良一; WYGANT John; BRENEMAN Aaron; BONNELL John; KLETZING Craig A.
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, 201802275970250250 - 原子大気オーロラ輝線777.4nmへの分子大気オーロラ輝線の影響評価
大山伸一郎; 細川敬祐; 小川泰信; 三好由純; 津田卓雄; 栗田怜; ANTTI Kero; 藤井良一; 野澤悟徳; 宮岡宏; 田中良昌; 田中良昌; 水野亮; 川端哲也
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, 201802281484509466 - 北欧全天カメラ及びVan Allen Probesを用いた脈動オーロラ同時観測事例の解析
川村豪; 細川敬祐; 栗田怜; 大山伸一郎; 大山伸一郎; 三好由純; 小川泰信; 藤井良一; 藤井良一; WYGANT John; BRENEMAN Aaron; BONNELL John; KLETZING Craig
2017, 極域科学シンポジウム(Web), 8th, 201802266541191618 - 南極域大気光イメージャとSwarm衛星を用いた南極域極冠パッチの統計的性質に関する研究
香川亜希子; 細川敬祐; 小川泰信; 門倉昭; 海老原祐輔
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, 201802248307524757 - ポーラーパッチならびにブロブの電子密度分布と極冠イオン対流速度の関係
吹澤瑞貴; 坂野井健; 小川泰信; 田中良昌; 細川敬祐; 田口聡; EVAN Thomas
2017, 日本地球惑星科学連合大会予稿集(Web), 2017, 201802222740845993 - ノルウェー・トロムソにおけるGNSS受信機を用いた電離圏シンチレーションと全電子数の観測
坂本明香; 大塚雄一; 小川泰信; 細川敬祐
2017, 日本地球惑星科学連合大会予稿集(Web), 2017, 201802217291578362 - ノルウェー・トロムソにおけるGNSS受信機を用いた電離圏シンチレーションの多点観測
坂本明香; 大塚雄一; 小川泰信; 細川敬祐
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, 201802269558452749 - 脈動電子オーロラのあらせ衛星および地上観測の初期結果報告:コーラス波動が駆動源と考えられる脈動オーロラパッチの時空間解析
井上拓海; 井上智寛; 尾崎光紀; 八木谷聡; 海老原祐輔; 疋島充; 細川敬祐; 今村幸佑; 門倉昭; 笠羽康正; 笠原禎也; 片岡龍峰; 加藤雄人; 小嶋浩嗣; 熊本篤志; 栗田怜; 松田昇也; 松岡彩子; 三好由純; 西山尚典; 小川泰信; 岡田雅樹; 大塚雄一; 大山伸一郎; 佐藤由佳; 塩川和夫; 田中良昌; 田中良昌; 土屋史紀; CONNORS Martin
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, ROMBUNNO.S001‐P21 (WEB ONLY), Japanese, 201802236579442399 - アイスランド~昭和基地共役点観測の現状
門倉昭; 田中良昌; 片岡龍峰; 内田ヘルベルト陽仁; 岡田雅樹; 小川泰信; 佐藤由佳; 田口真; 尾崎光紀; 塩川和夫; 細川敬祐; 三好由純; 元場哲郎; 行松彰; 山岸久雄; 佐藤夏雄
2017, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 142nd, ROMBUNNO.S001‐36 (WEB ONLY), Japanese, 201802281284186854 - Stable sun-aligned arcs equatorward of the cusp
Taguchi, S; K. Hosokawa; Y. Ogawa; T. Aoki; M. Taguchi
May 2016, 日本地球惑星科学連合2016年大会講演集, PEM18-02 - カスプの赤道側の安定したsun-aligned オーロラアーク: 全天イメージャーとEISCATの同時観測
田口 聡; 細川 敬祐; 小川 泰信
Mar. 2016, EISCATシンポジウム - 主成分分析を用いた脈動オーロラの変調解析
浅野貴紀; 三好由純; 栗田怜; 町田忍; 西山尚典; 片岡龍峰; 福田陽子; 内田ヘルベルト陽仁; 大山伸一郎; 塩川和夫; 細川敬祐; 小川泰信
2016, 極域科学シンポジウム(Web), 7th, 201702233364887794 - Sun-Aligned arcの運動メカニズム再考:3台の全天カメラと短波レーダーによる同時観測
木村洋太; 細川敬祐; 塩川和夫; 田口聡; 大塚雄一; 小川泰信
2016, 極域科学シンポジウム(Web), 7th, 201702275985676926 - Sun-aligned arcの運動メカニズム再考:3台の全天カメラと短波レーダーによる同時観測
木村洋太; 細川敬祐; 塩川和夫; 田口聡; 大塚雄一; 小川泰信
2016, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 140th, 201802220673395948 - 全天カメラで取得された脈動オーロラの画像に対する主成分分析を用いた変調解析
浅野貴紀; 三好由純; 栗田怜; 町田忍; 西山尚典; 片岡龍峰; 福田陽子; 内田ヘルベルト陽仁; 大山伸一郎; 塩川和夫; 細川敬祐; 小川泰信
2016, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 140th, 201802259878171921 - ポーラーパッチ後縁部に見られる指状構造:2次元数値シミュレーションとESRによる観測データの比較
高橋透; 平木康隆; 細川敬祐; 小川泰信; 坂井純
2016, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 140th, 201802276485674096 - 脈動オーロラが起こすナトリウム密度変動の研究:高速ナトリウムライダー観測
高橋透; 津田卓雄; 細川敬祐; 野澤悟徳; 小川泰信; 川原琢也; 斎藤徳人; 和田智之; 川端哲也; HALL Chris
2016, 日本地球惑星科学連合大会予稿集(Web), 2016, 201702217929045230 - ノルウェー・トロムソにおけるGNSS受信機による電離圏シンチレーション観測
大塚雄一; 上蔀広大; 小川泰信; 細川敬祐
2016, 日本地球惑星科学連合大会予稿集(Web), 2016, 201702261220713631 - オーロラの全天高速撮像による事例解析
内田ヘルベルト陽仁; 片岡龍峰; 門倉昭; 小川泰信; 細川敬祐
2016, 極域科学シンポジウム(Web), 7th, 201702289407883174 - オーロラの発生とGPSシンチレーションの関連性についての統計解析
加藤優作; 細川敬祐; 大塚雄一; 小川泰信; 福田陽子; 片岡龍峰; 田中正行
2016, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 140th, 201802238179741160 - 小型で安価な大気光イメージャを用いたプラズマバブルの観測
高見晃平; 細川敬祐; 斎藤享; 小川泰信
2016, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 140th, 201802260023370026 - アイスランド~昭和基地共役点観測の現状と将来
門倉昭; 田中良昌; 佐藤由佳; 片岡龍峰; 岡田雅樹; 小川泰信; 田口真; 尾崎光紀; 細川敬祐; 行松彰; 山岸久雄; 佐藤夏雄
2016, 極域科学シンポジウム(Web), 7th, OS_Kadokura_00291_01 (WEB ONLY), Japanese, 201702213626110325 - サブストーム回復相におけるオーロラパッチと下部熱圏風速変動
大山伸一郎; 塩川和夫; 三好由純; 細川敬祐; WATKINS Brenton J; 栗原純一; 津田卓雄; FALLEN Cristopher T
2016, 日本地球惑星科学連合大会予稿集(Web), 2016, ROMBUNNO.PEM16‐13 (WEB ONLY), Japanese, 201702264563477362 - Cusp aurora as a backward-elongated image of the moving region of electron precipitation
TAGUCHI Satoshi; CHIBA Yasunaga; HOSOKAWA Keisuke; OGAWA Yasunobu
May 2015, 日本地球惑星科学連合2015年大会講演集, PEM09-03 - 動く電子降下領域の後方に延びるカスプオーロラ：EISCATと全天イメージャーの同時観測
田口 聡; 千葉 康永; 細川 敬祐; 小川 泰信
Mar. 2015, EISCATシンポジウム - 夕方側オーロラオーバル内におけるオーロラアークの周期的生成
前尾友紀子; 細川敬祐; 平木康隆; 木村洋太; 井上恵一; 田口聡; 小川泰信
2015, 極域科学シンポジウム講演予稿集(CD-ROM), 6th, 201602200968677167 - IMAGE FUVとSuperDARNによる極域ジュール加熱率と沿磁力線電流の導出
尾崎直紀; 細川敬祐; 小川泰信; 藤田茂; 田中高史
2015, 極域科学シンポジウム講演予稿集(CD-ROM), 6th, 201602211775541804 - 極冠オーロラの運動メカニズム再考:2台の全天カメラと短波レーダーによる観測
木村洋太; 細川敬祐; 塩川和夫; 田口聡; 大塚雄一; 小川泰信
2015, 極域科学シンポジウム講演予稿集(CD-ROM), 6th, 201602211996828008 - 高感度全天イメージャによる観測を用いたポーラーパッチのエッジに関する統計解析
對比地雄大; 細川敬祐; 田口聡; 小川泰信; 松村充
2015, 極域科学シンポジウム講演予稿集(CD-ROM), 6th, 201602221192392423 - 夕方側オーロラオーバル内におけるオーロラアークの周期的生成
前尾友紀子; 細川敬祐; 平木康隆; 木村洋太; 井上恵一; 田口聡; 小川泰信
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602217083245878 - IMAGE FUVとSuperDARNによる極域ジュール加熱率と沿磁力線電流の導出
尾崎直紀; 細川敬祐; 小川泰信; 藤田茂; 田中高史
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602223247263978 - 極冠オーロラの運動メカニズム再考:2台の全天カメラと短波レーダーによる観測
木村洋太; 細川敬祐; 塩川和夫; 田口聡; 大塚雄一; 小川泰信
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602248571375208 - 高感度全天イメージャによる観測を用いたポーラーパッチのエッジに関する統計解析
對比地雄大; 細川敬祐; 田口聡; 小川泰信; 松村充
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602261136979927 - Postnoon auroral spotsの特性
辻本洋平; 田口聡; 細川敬祐; 小川泰信
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602276392630508 - 小型大気光カメラによる極冠パッチの撮像
細川敬祐; 小川泰信; 田口聡
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, 201702226347160653 - 極冠パッチと共存する極冠アークの発生
坂井純; 細川敬祐; 田口聡; 小川泰信
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, 201702254531920470 - 真昼過ぎオーロラスポットと極向きにドリフトする複数のアーク
辻本洋平; 田口聡; 細川敬祐; 小川泰信
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, 201702266806395765 - 無人システムを利用したオーロラ現象の南極広域ネットワーク観測
門倉昭; 山岸久雄; 岡田雅樹; 小川泰信; 田中良昌; 元場哲郎; 細川敬祐; 才田聡子; 三好由純; 行松彰; 宮岡宏; 片岡龍峰
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, 201702287609197973 - ノルウェー・トロムソにおけるGNSS受信機を用いた電離圏シンチレーションの観測
上蔀広大; 大塚雄一; 小川泰信; 細川敬祐
2015, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 138th, 201602251863792987 - トロムソにおけるGNSS受信機を用いた電離圏シンチレーション観測
上蔀広大; 大塚雄一; 小川泰信; 細川敬祐
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, 201702269732732920 - サブストーム回復相のオーロラパッチ中に現れる下部熱圏風速変動
大山伸一郎; 塩川和夫; 三好由純; 細川敬祐; WATKINS Brenton J; 栗原純一; 津田卓雄
2015, 日本地球惑星科学連合大会予稿集(Web), 2015, ROMBUNNO.PEM28‐09 (WEB ONLY), Japanese, 201702268380146964 - 太陽地球系現象の南北両極共役観測ネットワーク
門倉昭; 山岸久雄; 宮岡宏; 行松彰; 岡田雅樹; 小川泰信; 田中良昌; 片岡龍峰; 海老原祐輔; 田口真; 細川敬祐; 元場哲郎; 佐藤由佳
2014, 極域科学シンポジウム講演予稿集(CD-ROM), 5th, 201502290461500312 - 極方向に伝搬するカスプオーロラの動的特性:全天イメージャ観測に基づく統計解析
新山峻平; 細川敬祐; 田口聡; 小川泰信
2014, 極域科学シンポジウム講演予稿集(CD-ROM), 5th, 201502206492189592 - IMAGE FUVとSuperDARNによる極域ジュール加熱率の導出
尾崎直紀; 細川敬祐; 小川泰信
2014, 極域科学シンポジウム講演予稿集(CD-ROM), 5th, 201502212157242187 - 小型大気光カメラによるポーラーパッチの撮像
細川敬祐; 小川泰信; 田口聡
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602212176135600 - 高感度全天イメージャによる観測を用いたポーラーパッチのエッジに関する統計解析
對比地雄大; 細川敬祐; 田口聡; 小川泰信; 松村充
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602212965764633 - 高感度全天イメージャによって観測された高緯度昼間側MSTIDの特性
内海俊人; 細川敬祐; 田口聡; 小川泰信
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602220811512070 - オーロラ発光とGPSシンチレーションの関連性
三井俊平; 細川敬祐; 大塚雄一; 小川泰信; 西岡未知
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602225835492196 - 極方向に伝搬するカスプオーロラの動的特性:全天イメージャ観測に基づく統計解析
新山峻平; 細川敬祐; 田口聡; 小川泰信
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602260485823355 - EISCAT高速スキャンで観測した電離圏トラフ境界近傍の電子密度構造
石田哲朗; 小川泰信; 門倉昭; 細川敬祐; 大塚雄一
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602264988418150 - IMAGE FUVとSuperDARNによる極域ジュール加熱率の導出
尾崎直紀; 細川敬祐; 小川泰信
2014, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 136th, 201602283268986512 - オーロラ発光とGPSシンチレーションの関連性
三井俊平; 細川敬祐; 大塚雄一; 小川泰信; 西川未知
2014, 極域科学シンポジウム講演予稿集(CD-ROM), 5th, 201502246169672588 - Control system design for the optical observations of the aurora and airglow based on LabVIEW
青木 猛; 田口 聡; 細川 敬祐
Computer-based control systems play an important role in instruments for the optical observations of the aurora and airglow. We developed the control system based on LabVIEW for our new optical instrument. The LabVIEW-based system controls the Electron Multiplier CCD camera and filter turret containing passband filters. Through the robust and flexible control of these equipments the instrument can adapt to a wide range of conditions, and obtain all-sky images over a long period of time. This article focuses on the important points of the control system. The instrument was set up at Longyearbyen, Svalbard in October 2011, and obtained valuable data during the first season as was expected., 電気通信大学, 01 Feb. 2013, 電気通信大学紀要, 25, 1, 85-89, Japanese, 0915-0935, 120006315579 - 極冠オーロラの微細構造および周期性に関する研究
前尾友紀子; 細川敬祐; 田口聡; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402218574305532 - 全天イメージャ観測に基づくカスプのpoleward-moving auroral formの統計的性質
新山峻平; 田口聡; 細川敬祐; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402240571498262 - 電離圏カスプで同定される電子密度の周期構造:全天イメージャとEISCATの同時観測
千葉康永; 田口聡; 細川敬祐; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402246938964492 - 複数の全天イメージャとレーダーを用いた極冠オーロラの広域イメージング
最所崇; 細川敬祐; 塩川和夫; 田口聡; 大塚雄一; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402254772841608 - 高感度全天イメージャーによる高緯度昼間側の中規模伝搬性電離圏擾乱の観測
内海俊人; 田口聡; 細川敬祐; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402270147844599 - ノルウェー・トロムソにおけるGNSS受信機を用いたシンチレーション観測
伊藤裕作; 大塚雄一; 塩川和夫; 細川敬祐; 小川泰信
2013, 極域科学シンポジウム講演予稿集(CD-ROM), 4th, 201402272011167642 - ノルウェー・トロムソにおけるGNSS受信機を用いたシンチレーション観測
伊藤裕作; 大塚雄一; 塩川和夫; 細川敬祐; 小川泰信
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402282943108258 - オーロラ爆発とGPSシンチレーションの関連性の研究
三井俊平; 細川敬祐; 大塚雄一; 小川泰信; 津川卓也
2013, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 134th, 201402293698229038 - ノルウェー・トロムソにおけるGNSSシンチレーション観測
大塚雄一; 伊藤祐作; 小川泰信; 細川敬祐
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, 201302218057734655 - Plasma structuring in the polar cap ionosphere: an observation with all-sky airglow imager in Longyearbyen, Norway
HOSOKAWA KEISUKE; TAGUCHI SATOSHI; OGAWA YASUNOBU
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, ROMBUNNO.B005-25, English, 201302201407864131 - Pulsating aurora seen in the dayside polar ionosphere
OGAWA YASUNOBU; HOSOKAWA KEISUKE; TAGUCHI SATOSHI; SUZUKI SHIN; KADOKURA AKIRA; MIYAOKA HIROSHI
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, ROMBUNNO.B006-P027, English, 201302207967365252 - Storm-time observation of optical polar patches and electron density in evening polar cap
SAKAI JUN; HOSOKAWA KEISUKE; TAGUCHI SATOSHI; OGAWA YASUNOBU
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, ROMBUNNO.B005-26, English, 201302216760169665 - Longitudinal profiles of the dayside aurora and F-region plasma parameters:Observations by all-sky imager and ESR equi-MLAT mode
TAGUCHI SATOSHI; OGAWA YASUNOBU; HOSOKAWA KEISUKE
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, ROMBUNNO.B006-54, English, 201302253986799486 - 全天イメージャとEISCATレーダーの同時観測に基づく極域電離圏カスプの電子密度微細構造の周期的変動特性
千葉康永; 田口聡; 細川敬祐; 小川泰信
2012, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 132nd, ROMBUNNO.B006-P016, Japanese, 201302290237647249 - Simultaneous optical and radar observations of eastward drifting auroral forms
MOTOBA TETSUO; HOSOKAWA KEISUKE; OGAWA YASUNOBU; YUKIMATU AKIRA SESSAI; SATO NATSUO
2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th, ROMBUNNO.B010-P006, English, 201102208427499847 - Ionospheric irregularities observed by optics, GPS scintillation and HF radar during substorm
HOSOKAWA KEISUKE; OTSUKA YUICHI; OGAWA YASUNOBU; TSUGAWA TAKUYA
2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th, ROMBUNNO.B005-34, English, 201102279727096110 - Plasma temperature enhancements associated with transient flow in the cusp
TAGUCHI SATOSHI; SHIRAKAWA TAKUYA; HOSOKAWA KEISUKE; OGAWA YASUNOBU
2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th, ROMBUNNO.B006-17, English, 201102285773460005 - カスプのフローバーストに伴う電子密度の高度方向変動特性
白川拓也; 田口聡; 細川敬祐; 小川泰信
2010, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 128th, 201102222349573116 - SuperDARN北海道‐陸別HFレーダーで観測されたSAPS/SAID構造中の長・中・短周期時間変動
西谷望; 小川忠彦; 菊池崇; 海老原祐輔; 堀智昭; ZOU Yun; 細川敬祐; 片岡龍峰; 西谷望
2010, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 128th, ROMBUNNO.B006-20, Japanese, 201102236426868800 - SuperDARN北海道‐陸別HFレーダーの現況報告(2010.10)
西谷望; 小川忠彦; 菊池崇; 海老原祐輔; 堀智昭; 行松彰; 塩川和夫; 大塚雄一; ZOU Yun; 細川敬祐; 片岡龍峰; 久保田実; 西谷望
2010, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 128th, ROMBUNNO.B010-P007, Japanese, 201102241154702196 - In-situ evidence for the IMF-induced tail twisting in association with interhemispheric displacement of conjugate auroras
MOTOBA TETSUO; HOSOKAWA KEISUKE; OGAWA YASUNOBU; SATO NATSUO; KADOKURA AKIRA
2010, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 128th, ROMBUNNO.B006-01, English, 201102222313097024 - ERG計画における連携地上ネットワーク観測
塩川和夫; 西谷望; 菊池崇; 大塚雄一; 三好由純; 藤井良一; 湯元清文; 河野英昭; 吉川顕正; 篠原学; 北村健太郎; 佐藤夏雄; 行松彰; 山岸久雄; 門倉昭; 小川泰信; 田中良昌; 長妻努; 田口真; 細川敬祐; 橋本久美子; 尾崎光紀; 大矢浩代
2010, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 128th, ROMBUNNO.B006-P005, Japanese, 201102249454097910 - 北海道‐陸別HFレーダーで観測されたSAPS/SAID構造の長周期変動
西谷望; 小川忠彦; 菊池崇; 海老原祐輔; 片岡龍峰; 堀智昭; 細川敬祐; 西谷望
2009, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 126th, ROMBUNNO.B006-07, Japanese, 201002297724806193 - SuperDARN北海道‐陸別短波レーダーの現況報告(2009.9)
西谷望; 小川忠彦; 菊池崇; 堀智昭; 塩川和夫; 大塚雄一; 行松彰; 行松彰; 細川敬祐; 海老原祐輔; 片岡龍峰; 西谷望
2009, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 126th, ROMBUNNO.B010-P004, Japanese, 201002243071019180 - カスプのフローバースト領域のプラズマ構造
白川拓也; 田口聡; 細川敬祐; 小川泰信
2009, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 126th, ROMBUNNO.B005-P024, Japanese, 201002202212758960 - 北海道‐陸別HFレーダーの現状報告(2008.10)
西谷望; 西谷望; 小川忠彦; 菊池崇; 堀智昭; 細川敬祐; 海老原祐輔; 片岡龍峰
2008, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 124th, ROMBUNNO.B010-P016, Japanese, 200902208215203273 - 北海道‐陸別HFレーダーとGEONETで観測された大規模性電離圏擾乱のマルチイベント解析
林秀和; 西谷望; 小川忠彦; 大塚雄一; 津川卓也; 細川敬祐; 齊藤昭則
2008, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 124th, ROMBUNNO.B005-17, Japanese, 200902252716909728 - THEMISとSuperDARNの観測を用いた磁気圏尾部と電離圏の高速プラズマ流の対応
宮下幸長; 細川敬祐; 高田拓; 堀智昭; 藤本正樹; ANGELOPOULOS Vassilis; MCFADDEN James P; ULI Auster H; 行松彰; 佐藤夏雄; MENDE S.B; DONOVAN Erick
2008, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 124th, ROMBUNNO.B006-P023, Japanese, 200902221317238540 - EISCATレーダーを用いた日本の極域超高層大気観測の現状
小川泰信; 宮岡宏; 藤井良一; 野澤悟徳; 大山伸一郎; 平原聖文; 坂野井健; 阿部琢美; 小野高幸; 細川敬祐; 門倉昭; 行松彰
2008, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 124th, ROMBUNNO.S001-04, Japanese, 200902204848424710 - GPS受信機網とSuperDARNの同時観測による電離圏電子密度擾乱のスケール依存性の解明
岡本俊太; 齊藤昭則; 細川敬祐; 家森俊彦
2007, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 122nd, ROMBUNNO.B005-P027, Japanese, 200902235185926264 - 2006年12月15日に北海道‐陸別HFレーダーとGEONETで観測された大規模伝搬性電離圏擾乱
林秀和; 西谷望; 小川忠彦; 大塚雄一; 津川卓也; 細川敬祐; 齊藤昭則
2007, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 122nd, ROMBUNNO.B005-P011, Japanese, 200902248407346940 - 北海道‐陸別HFレーダーで観測された地磁気嵐時の昼間側極方向高速流
西谷望; 小川忠彦; 菊池崇; 片岡龍峰; 細川敬祐; 佐藤夏雄; 行松彰; 行松彰; 西谷望
2007, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD−ROM), 122nd, ROMBUNNO.B006-28, Japanese, 200902262957917158 - Possible observation of spatial and temporal structure of the "overshielding" from the SuperDARN Hokkaido radar
Ebihara, Y; N. Nishitani; T. Kikuchi; T. Ogawa; K. Hosokawa; M.-C. Fok
2007, SuperDARN Workshop 2007, English - Motion of the cusp and pulsed ion upflow: Simultaneous observations from IMAGE spacecraft, EISCAT and SuperDARN radars
TAGUCHI SATOSHI; OGAWA YASUNOBU; HOSOKAWA KEISUKE; MORIMOTO MINAKO; COLLIER MICHAEL R; MOORE THOMAS E; YUKIMATU AKIRA SESSAI; SATO NATSUO
2007, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 122nd, ROMBUNNO.B006-11, English, 200902279234405884 - EISCAT UHFレーダーとSuperDARN HFレーダーで観測された夕方側西向き高速イオン対流内におけるイオン加熱
前田佐和子; 小川泰信; 野澤悟徳; 細川敬祐; 津田卓雄; 大山伸一郎; BREKKE Asgeir
2007, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 122nd, ROMBUNNO.B005-43, Japanese, 200902278969684616
Books and other publications
- 基礎電磁気学 : 電磁気学マップに沿って学ぶ
細川, 敬祐
Japanese, vi, 156p, 東京化学同人, Apr. 2023, 9784807920358 - 南極と北極の総合誌「極地」
片岡龍峰
Japanese, Contributor, 公益財団法人日本極地研究振興会, 01 Mar. 2018 - フォトサイエンス 物理図録（改訂版）
数研出版編集部
Textbook, Japanese, Contributor, 特集5 オーロラと宇宙天気, 数研出版, 01 Nov. 2016, 9784410265136 - 低温環境の科学事典
河村公隆
Dictionary or encycropedia, Japanese, Contributor, 1-10 オーロラ, 朝倉書店, 25 Jul. 2016, 9784254161281 - フォトサイエンス 物理図録
数研出版編集部
Textbook, Japanese, Contributor, 特集5 オーロラと宇宙天気, 数研出版, 01 Feb. 2013, 9784410263125
Lectures, oral presentations, etc.
- デジタルカメラの動画撮影機能による脈動オーロラの観測例と観測計画
南條壮汰; Olivier Staiger; Urban Brändström; 津田卓雄; 青木猛; 細川敬祐
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, 名古屋大学, Domestic conference
Sep. 2022 - Overview of the ground-based optical observations during the LAMP rocket experiment in Alaska
Hosokawa, K; Y. Miyoshi
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, 名古屋大学, Domestic conference
Sep. 2022 - あらせ衛星，地上全天カメラ，EISCAT レーダーによる磁気共役同時観測を用いた脈動オーロラ電子の エネルギーに関する研究
伊藤ゆり; 細川敬祐; 小川泰信; 三好由純; 村瀬清華; 吹澤瑞貴; 大山伸一郎; 中村紗都子; 笠原禎也; 松田昇也; 笠原慧; 風間洋一; 堀智昭; 横田勝一郎; 桂華邦裕; Shiang-Yu Wang; Sunny W; Y. Tam; 篠原育
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, 名古屋大学, Domestic conference
Sep. 2022 - Internatinal joint observations of electron precipitation from Geospace using combined radio and optical techniques
Hosokawa, K; S.-I. Oyama; C. Martinez; Y. Tanaka; A. Kero; J. Manninen
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, 名古屋大学, Domestic conference
Sep. 2022 - あらせ衛星を用いたダクトによるコーラス高緯度伝搬と脈動オーロラの関係の検討
伊藤ゆり; 細川敬祐; 小川泰信; 三好由純; 吹澤瑞貴; 村瀬清華; 大山伸一郎; 中村紗都子; 笠原禎也; 松田昇也; 笠原慧; 風間洋一; 堀智昭; 横田勝一郎; 桂華邦裕; Shiang-Yu Wang; Sunny W; Y. Tam; 篠原育
Oral presentation, Japanese, ERG サイエンス会議/内部磁気圏研究集会, 東京大学, Domestic conference
Sep. 2022 - オーロラ観測のためのデジカメの校正実験と 2022 年度の観測計画
南條壮汰; Urban Brändström; 津田卓雄; 青木猛; 細川敬祐
Oral presentation, Japanese, 中間圏・熱圏・電離圏 (MTI) 研究集会, 名古屋大学, Domestic conference
Sep. 2022 - ISS からのデジタルカメラを用いたオーロラ観測で得られる画像データの特徴
南條壮汰; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, Japanese, 宇宙空間からの地球超高層大気観測に関する研究会, 名古屋大学, Domestic conference
Sep. 2022 - Simultaneous conjugate observations of the energy of pulsating auroral electrons by Arase satellite, ground-based all-sky imagers and EISCAT radar
Ito, Y; K. Hosokawa; Y. Ogawa; Y. Miyoshi; K. Murase; M. Fukizawa; S.-I. Oyama; S. Nakamura; Y. Kasahara; S. Matsuda; S. Kasahara; Y. Kazama; T. Hori; S. Yokota; K. Keika; S. Wang; S. W; Y. Tam; I. Shinohara
Poster presentation, English, 20th International EISCAT Symposium 2022, Eskilstuna, Sweden, International conference
Aug. 2022 - あらせ衛星，全天カメラ，広角デジタルカメラで捉えたサブストームオンセット直後の脈動オーロラ
南條壮汰; Olivier Staiger; 門倉昭; 田中良昌; 片岡龍峰; 三好由純; 中村紗都子; 小川泰信; 笠原禎也; 松田昇也; 笠原慧; 風間洋一; 横田勝一郎; 堀智昭; 松岡彩子; 桂華邦裕; Chae-Woo Jun; 篠原育; 細川敬祐
Oral presentation, Japanese, JpGU Meeting, 幕張メッセ, Domestic conference
Jun. 2022 - 短波ドップラー観測に高度計測機能を追加するための新観測システムの検討
並木紀子; 細川敬祐; 野崎憲朗; 坂井純; 富澤一郎; 有澤豊志
Poster presentation, Japanese, JpGU Meeting, 幕張メッセ, Domestic conference
Jun. 2022 - あらせ衛星，EMCCD 全天カメラ，EISCAT レーダーによる磁気共役同時観測を用いた脈動オーロラ電子のエネルギーに関する研究
伊藤ゆり; 細川敬祐; 小川泰信; 三好由純; 大山伸一郎; 中村紗都子; 笠原禎也; 松田昇也; 篠原育
Poster presentation, Japanese, JpGU Meeting, 幕張メッセ, Domestic conference
Jun. 2022 - 航空航法用 ILS 遠距離伝搬波を用いた Es 下部構造の観測
田淵駿平; 細川敬祐; 斎藤享; 坂井純; 富澤一郎; 高橋透; 中田裕之
Poster presentation, Japanese, JpGU Meeting, 幕張メッセ, Domestic conference
Jun. 2022 - EMCCD カメラとあらせ衛星で捉えた内部変調の有無が時間的に変化したイベントの解析
南條壮汰; 江袋叡; 細川敬祐; 三好由純; 栗田怜; 中村紗都子; 大山伸一郎; 小川泰信; 笠原禎也; 笠原慧; 松岡彩子; 桂華邦裕; 堀智昭; 横田勝一郎; 松田昇也; 小路真史; 北原理弘; 今城峻; 篠原育; 藤井良一
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2022 - Diffuse Aurora の発生に寄与する降下電子の分布
安倍峻平; 細川敬祐; 小川泰信; 南條壮汰
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2022 - 衛星，高速撮像カメラ，大型大気レーダーの観測を用いた脈動オーロラ電子のエネルギーに関する研究
伊藤ゆり; 細川敬祐; 小川泰信; 三好由純; 大山伸一郎; 中村紗都子; 笠原禎也; 松田昇也; 篠原育
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2022 - トロムソにおける「多波長光学観測」の現状
細川敬祐; 大山伸一郎; 小川泰信; 三好由純; 栗田怜; 野澤悟徳
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2022 - International joint observations of electron precipitation from Geospace using combined radio and optical techniques
Hosokawa, K; S.-I. Oyama; C. Martinez; Y. Tanaka
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2022 - Tromsø AI: real-time notification service of auroral appearance in Tromsø, Norway
Sota Nanjo; Satonori Nozawa; Masaki Yamamoto; Tetsuya Kawabata; Magnar G. Johnsen; Takuo T. Tsuda; Keisuke Hosokawa
Poster presentation, English, AGU Fall Meeting, Online, International conference
Dec. 2021 - 深層学習を用いたオーロラの出現を通知するウェブアプリケーション
南條壮汰; 野澤悟徳; 山本雅毅; 川端哲也; Magnar; G. Johnsen; 津田卓雄; 細川敬祐
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「宇宙地球環境の理解に向けての統計数理的アプローチ」, Online, Domestic conference
Dec. 2021 - Relationship between Es and MSTIDs: Comparison of Doppler shift from HFD and GPS-TEC from GEONET
Matsushima, R; K. Hosokawa; J. Sakai; Y. Otsuka; M. K. Ejiri; S. Saito; M. Yamamoto; M. Nishioka; T. Tsugawa
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 150 回総会及び講演会, Online, Domestic conference
Nov. 2021 - Automated detection of mid-latitude sporadic E using GPS-TEC ROTI and aeronautical navigation radio wave data
Takahi, M; K. Hosokawa; J. Sakai; S. Saito
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 150 回総会及び講演会, Online, Domestic conference
Nov. 2021 - 昼側 PsA に寄与する降下電子に関する研究
安倍峻平; 細川敬祐; 小川泰信; 南條壮汰
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 150 回総会及び講演会, Online, Domestic conference
Nov. 2021 - Tromsø AI：ノルウェー・トロムソにおけるオーロラのリアルタイム検出システム
南條壮汰; 野澤悟徳; 山本雅毅; 川端哲也; Magnar; G. Johnsen; 津田卓雄; 細川敬祐
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 150 回総会及び講演会, Online, Domestic conference
Nov. 2021 - デジタルカメラで捉えた脈動オーロラの内部変調
南條壮汰; 細川敬祐; Olivier Staiger; 門倉昭; 田中良昌; 小川泰信; 松田昇也; 笠原禎也; 三好由純; 中村紗都子; 篠原育
Oral presentation, Japanese, あらせサイエンス会議, Online, Domestic conference
Oct. 2021 - 市民科学の促進を意識したオーロラのデジタルカメラ観測の活用例
南條壮汰; 細川敬祐; Olivier Staiger; 門倉昭; 田中良昌; 小川泰信; 松田昇也; 笠原禎也; 三好由純; 中村紗都子; 篠原育
Oral presentation, Japanese, 太陽地球系物理学分野のデータ解析手法、ツールの理解と応用研究集会, Online, Domestic conference
Sep. 2021 - 深層学習を用いたオーロラの自動検出システム：ノルウェー・トロムソにおけるリアルタイム運用
南條壮汰; 細川敬祐; 野澤悟徳; Magnar G. Johnsen
Poster presentation, English, JpGU Meeting, Online, International conference
Jun. 2021 - Simultaneous observations of plasma bubbles with an HF Doppler sounding system in Taiwan and an all-sky imager in Ishigaki Island
Sejima, H; K. Hosokawa; J. Chum; H. Nakata; J. Sakai; S. Saito
Poster presentation, English, JpGU Meeting, Online, International conference
Jun. 2021 - Automated detection of mid-latitude sporadic E using GPS-TEC ROTI data
Takahi, M; K. Hosokawa; J. Sakai; S. Saito
Poster presentation, English, JpGU Meeting, Online, International conference
Jun. 2021 - 国際宇宙ステーションからのデジタルカメラ撮像データを用いた孤立型プロトンオーロラ鉛直構造の推定
高橋一輝; 南條壮汰; 穂積裕太; 細川敬祐; 三好由純
Poster presentation, English, JpGU Meeting, Online, International conference
Jun. 2021 - ISS から観測された “Great Wall” オーロラの生成メカニズム
南條壮汰; 田中杜雄; 佐藤夏雄; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, English, JpGU Meeting, Online, International conference
Jun. 2021 - Spatial distribution of pulsating aurora with/without internal modulation
Kawamura, Y; K. Hosokawa; S.-I. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; S. Ebukuro; R. Fujii
Oral presentation, Japanese, ISEE Workshop: Pulsating Aurora Workshop, Online, Domestic conference
Jan. 2021 - 深層ニューラルネットワークを用いた全天デジカメ画像のオーロラ自動検出
南條壮汰; 細川敬祐; 野澤悟徳
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - 低高度衛星の光学・粒子同時観測が捉えた脈動オーロラ中に現れる inverted-V 構造
南條壮汰; 田中杜雄; 佐藤夏雄; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - 脈動オーロラの主脈動及び内部変調に伴う降下粒子エネルギーの変動
江袋叡; 細川敬祐; 三好由純; 大山伸一郎; 小川泰信; 栗田怜; 笠原禎也; 笠原慧; 松岡彩子; 桂華邦裕; 堀智昭; 横田勝一郎; 松田昇也; 小路真史; 北原理弘; 中村紗都子; 今城峻; 篠原育; 藤井良一
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - 2020 年 1 月に観測された長期の昼側 PsA イベントについて
安倍峻平; 細川敬祐; 小川泰信
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - LAMP 地上サポート観測紹介
細川敬祐; 三好由純; LAMP; ロケットグループ
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - 2017-2020 年の脈動オーロラ光学/レーダー観測のまとめ - あらせ衛星とのコンジャンクション観測を中心に
細川敬祐; 小川泰信; 基盤 S; 地上観測チー
Oral presentation, Japanese, 名古屋大学 ISEE 研究集会「脈動オーロラ研究集会」, Online, Domestic conference
Jan. 2021 - Overview of the Russia/Japan optical observations in 2020-2021 season
Hosokawa, K
Oral presentation, English, ISEE Workshop: Pulsating Aurora Workshop, Online, Domestic conference
Jan. 2021 - Estimation of energy of precipitating electrons causing pulsating aurora and omega band: Digital camera observations from ISS
Nanjo, S; N. Sato; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S.-I. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Oral presentation, English, American Geophysical Union Fall Meeting, Online, International conference
Dec. 2020 - Concentrically expanding ring-shaped pulsating aurora: simultaneous observations with Arase and high-speed cameras in Scandinavia
Hosokawa, K; S. Kurita; Y. Miyoshi; S.-I. Oyama; Y. Ogawa; Y. Kasahara; Y. Kasaba; S. Yagitani; M. Ozaki; S. Matsuda; F. Tsuchiya; A. Kumamoto; A. Matsuoka; R. Kataoka; K. Shiokawa; M. Shoji; S. Imajo; T. Takashima; I. Shinohara; R. Fujii
Oral presentation, English, Online, International conference
Dec. 2020 - 国際宇宙ステーションからのリム方向デジカメ観測を用いたオーロラ電子のエネルギー推定
南條壮汰; 佐藤夏雄; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 148 回総会及び講演会, Online, Domestic conference
Nov. 2020 - 昼側脈動オーロラの周期性に関する統計解析
安倍峻平; 細川敬佑; 小川泰信
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 148 回総会及び講演会, Online, Domestic conference
Nov. 2020 - Spatial distribution of pulsating aurora with/without internal modulation
Kawamura, Y; K. Hosokawa; S.-I. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; S. Ebukuro; R. Fujii
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 148 回総会及び講演会, Online, Domestic conference
Nov. 2020 - Fine scale structures of chorus elements characterizing internal modulation of pulsating aurora
Ebukuro, S; K. Hosokawa; Y. Miyoshi; S.-I. Oyama; Y. Ogawa; S. Kurita; Y. Kasahara; S. Kasahara; A. Matsuoka; K. Keika; T. Hori; S. Yokota; S. Matsuda; M. Shoji; M. Kitahara; S. Nakamura; S. Imajo; I. Shinohara; R. Fujii
Oral presentation, Japanese, Online, Domestic conference
Nov. 2020 - Propagation characteristics of Sporadic-E and MSTIDs: Statistics using HF Doppler and GPS-TEC data
Matsushima, R; K. Hosokawa; Jun Sakai; M. K. Ejiri; M. Nishioka; T. Tsugawa
Oral presentation, Japanese, Online, Domestic conference
Nov. 2020 - Polar mesospheric cloud (PMC) structures tracking with data from the meteorological satellite Himawari-8
Hozumi, Y; T. Tsuda; Y. Ando; K. Hosokawa; H. Suzuki; T. Nakamura; K. T. Murata
Oral presentation, Japanese, Online, Domestic conference
Nov. 2020 - 極中間圏雲の発生と磁気圏からの高エネルギー電子降下の関連について
細川敬祐; 津田卓雄; 穂積裕太; 安藤芳晃; 鈴木秀彦; 中村卓司; 村田 健史
Oral presentation, Japanese, Online, Domestic conference
Nov. 2020 - 国際宇宙ステーションからのデジカメ観測による脈動オーロラの広域空間特性
南條壮汰; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, Japanese, 宇宙空間からの地球超高層大気観測に関する研究会, Online, Domestic conference
Sep. 2020 - HF ドップラー観測システムと GPS 全電子数観測を用いたスポラディック E と中規模伝搬性電離圏擾乱の相関について
松嶋諒; 細川敬祐; 坂井純; 江尻省; 西岡未知; 津川卓也
Oral presentation, Japanese, Online, Domestic conference
Sep. 2020 - Full-scale spatial characteristics of pulsating aurora derived from color digital camera images from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S.-I. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, JpGU Meeting, Online, International conference
Jul. 2020 - “Great Wall” seen in the omega band: full-color digital camera observation from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S.-I. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, JpGU Meeting, Online, International conference
Jul. 2020 - Simultaneous ground-satellite observation of dayside pulsating aurora
Abe, S; K. Hosokawa; Y. Ogawa
Poster presentation, English, JpGU Meeting, Online, International conference
Jul. 2020 - Observations of night time Sporadic-E layer by HF Doppler sounder network:association with Medium-Scale Traveling Ionospheric Disturbance (MSTID)
Matsushima, R; K. Hosokawa; J. Sakai; M. K. Ejiri; M. Nishioka; T. Tsugawa
Poster presentation, English, JpGU Meeting, Online, International conference
Jul. 2020 - Short review for recent studies of pulsating aurora in Japan during Arase era
Hosokawa, K; Y. Miyoshi; M. Ozaki; S.-I. Oyama; Y. Ogawa; S. Kurita; Y. Kasahara; Y. Kasaba; S. Yagitani; S. Matsuda; F. Tsuchiya; A. Kumamoto; R. Kataoka; K. Shiokawa; H. Miyaoka; Y. Tanaka; S. Nozawa; M. Teramoto; T. Takashima; I. Shinohara; R. Fujii
Poster presentation, English, JpGU Meeting, Invited, Online, International conference
Jul. 2020 - Spatial distribution of multiple temporal variations of pulsating aurora: multi-point high-speed optical observations in Scandinavia
Kawamura, Y; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; R. Fuji
Oral presentation, English, Physics of Auroral Phenomena 43rd Apatity Sminar, Apatity, Russia, International conference
Mar. 2020 - What controls the luminosity of polar cap airglow patches? : implication from airglow measurement in Eureka, Canada
Hosokawa, K; K. Shiokawa; Y. Otsuka; S. Taguchi
Oral presentation, English, American Geophysical Union Fall Meeting, San Francisco, USA, International conference
Dec. 2019 - Fine-scale temporal characteristics of pulsating aurora: dependence on background parameters in the magnetospheric source region
Ebukuro, S; K. Hosokawa; Y. Miyoshi; S. Oyama; Y. Ogawa; S. Kurita; Y. Kawamura; V. Jordanova; R. Fujii
Poster presentation, English, American Geophysical Union Fall Meeting, San Francisco, USA, International conference
Dec. 2019 - Multiple temporal variations of pulsating aurora: multi-point high-speed optical observations in Scandinavia
Kawamura, Y; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; R. Fuji
Poster presentation, English, American Geophysical Union Fall Meeting, San Francisco, USA, International conference
Dec. 2019 - Monitoring of anomalous propagation of VHF aeronautical navigation radio waves by the sporadic-E layer
Saito, S; K. Hosokawa; J. Sakai; I. Tomizawa
Poster presentation, English, American Geophysical Union Fall Meeting, San Francisco, USA, International conference
Dec. 2019 - Latitudinal and Longitudinal Variations of Pulsating Aurora Periodicities: Digital Camera Observations from International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, American Geophysical Union Fall Meeting, San Francisco, USA, International conference
Dec. 2019 - Anomalous propagation of VHF NAV signals by the sporadic E layer
Hosokawa, K; J. Sakai; I. Tomizawa; S. Saito; T. Tsugawa; M. Ishii
Oral presentation, English, EIWAC 2019, Tokyo, Japan, International conference
Oct. 2019 - 国際宇宙ステーションからのデジタルカメラ観測を用いた脈動オーロラ時空間特性の広域可視化
南條壮汰; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - 航空航法用 VHF 帯電波の異常伝搬と ROTI を組み合わせたスポラディック E 層の広域可視化
木村康択; 細川敬祐; 坂井純; 斎藤享; 冨澤一郎; 津川卓也; 西岡未知; 石井守
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - Large-scale signatures of pulsating aurora characterized by ambient parameters in the magnetosphere
Ebukuro, S; K. Hosokawa; Y. Miyoshi; S. Oyama; Y. Ogawa; S. Kurita; Y. Kawamura; V. Jordanova; R. Fujii
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - 低高度衛星からの光学観測を用いた磁気嵐時の孤立型プロトンオーロラの汎地球的連続観測
川合悠生; 細川 敬祐; 穂積裕太; 塩川和夫; 栗田怜; 尾崎光紀; 坂野井健; Boris Shevtsov; Igor Poddelsky; Tero Raita
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - Spatial distribution of multiple temporal variations of pulsating aurora
Kawamura, Y; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; R. Fujii
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - スポラディック E 層による計器着陸システム (ILS) 電波の異常伝搬
坂井純; 細川敬祐; 冨澤一郎; 斎藤享
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - 低高度衛星の紫外線観測を用いたオーロラオーバル赤道側境界の統計解析
京サリ; 細川敬祐; 南條壮汰; 川合悠生
Poster presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - Estimation of the altitude of pulsating aurora emission by using five-wavelength photomete
Kawamura, Y; K. Hosokawa; S. Nozawa; Y. Ogawa; T. Kawabata; R. Fujii
Poster presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - Sporadic E monitoring system using anomalous propagation of VHF radio waves for aircraft navigation
Hosokawa, K; J. Sakai; I. Tomizawa; S. Saito; T. Tsugawa; M. Nishioka; M. Ishii
Oral presentation, Japanese, 地球電磁気・地球惑星圏学会（SGEPSS）第 146 回総会及び講演会, 熊本, Domestic conference
Oct. 2019 - 国際宇宙ステーションからのデジカメ観測による脈動オーロラの広域空間特性
南條壮汰; 穂積裕太; 細川敬祐; 片岡龍峰; 三好由純; 大山伸一郎; 尾崎光紀; 塩川和夫; 栗田怜
Oral presentation, Japanese, 宇宙空間からの地球超高層大気観測に関する研究会, Online, Domestic conference
Sep. 2019 - HF ドップラー観測システムと GPS 全電子数観測を用いたスポラディック E と中規模伝搬性電離圏擾乱の相関について
松嶋諒; 細川敬祐; 坂井純; 江尻省; 西岡未知; 津川卓也
Oral presentation, Japanese, 中間圏・熱圏・電離圏 (MTI) 研究集会, Online, Domestic conference
Sep. 2019 - History and current status of ionospheric radio observations by UEC
Hosokawa, K
Oral presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - Mapping of Digital Camera Images from the International Space Station: Application for Pulsating Aurora Studies
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - Large-scale characteristics of chorus waves as inferred from high-speed optical observations of pulsating aurora
Ebukuro, S; K. Hosokawa; Y. Miyoshi; S. Oyama; Y. Ogawa; S. Kurita; Y. Kawamura; V. Jordanova; R. Fujii
Poster presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - Visualization of two-dimensional structure of Sporadic-E in a wide area by using air-band VHF radio observations and GPS-ROTI
Kimura, K; K. Hosokawa; J. Sakai; S. Saito; T. Tsugawa; M. Nishioka; M. Ishii; I. Tomizawa
Poster presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - Continuous and global observations of isolated proton aurora from low-altitude satellite during magnetic storm
Kawai, H; K. Hosokawa; Y. Hozumi; K. Shiokawa; S. Kurita; M. Ozaki; T. Sakanoi; B. Shevtsov; I. Poddelsky; T. Raita
Poster presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - The MLT dependence on the emission altitude of pulsating aurora
Kawamura, Y; K. Hosokawa; S. Nozawa; Y. Ogawa; T. Kawabata; R. Fuji
Poster presentation, English, URSI-Japan Radio Science Meeting, Tokyo, Japan, International conference
Sep. 2019 - 地上観測で見えるカスプオーロラの動的特性の紹介
細川敬祐
Oral presentation, Japanese, 地球磁気圏撮像観測に関する研究会, 宇宙科学研究所，相模原, Domestic conference
Sep. 2019 - Observations of PsA during Arase and ground-based conjunction intervals in March 2019
Hosokawa, K
Oral presentation, English, ISEE Workshop: Pulsating Aurora Workshop, Nagoya, Japan, International conference
Jul. 2019 - Fine-scale visualization of aurora in a wide area using color digital camera images from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Oral presentation, English, ISEE Workshop: Pulsating Aurora Workshop, Nagoya, Japan, International conference
Jul. 2019 - Large-scale characteristics of pulsating aurora periodicities: multi-point high-speed optical observations in Scandinavia
Ebukuro, S; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; Y. Kawamura; R. Fujii
Oral presentation, English, ISEE Workshop: Pulsating Aurora Workshop, Nagoya, Japan, International conference
Jul. 2019 - Latitudinal dependence of internal modulation of PsA seen in simultaneous optical observations from 4 stations in Scandinavia
Kawamura, Y; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; R. Fujii
Oral presentation, English, ISEE Workshop: Pulsating Aurora Workshop, Nagoya, Japan, International conference
Jul. 2019 - Fine-scale visualization of aurora in a wide area using color digital camera images from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, SuperDARN Workshop, Fuji-Yoshida, Japan, International conference
Jun. 2019 - A network of HF Doppler sounding systems in Japan: possible collaboration with SuperDARN
Hosokawa, K; H. Nakata; K. K. Hashimoto; I. Tomizawa; J. Sakai; T. Kikuchi; K. Nozaki
Poster presentation, English, SuperDARN Workshop, Fuji-Yoshida, Japan, International conference
Jun. 2019 - IMF By dependence of polar cap patch occurrence: statistics using airglow data from Eureka, Canada in comparison with SuperDARN convection patterns
Hosokawa, K; M. Nagata; K. Shiokawa; Y. Otsuka
Poster presentation, English, SuperDARN Workshop, Fuji-Yoshida, Japan, International conference
Jun. 2019 - Fine-scale visualization of aurora in a wide area using color digital camera images from the International Space Station
Nanjo, S; Y. Hozumi; K. Hosokawa; R. Kataoka; Y. Miyoshi; S. Oyama; M. Ozaki; K. Shiokawa; S. Kurita
Poster presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - Large-scale characteristics of pulsating aurora periodicities: multi-point high-speed optical observations in Scandinavia
Ebukuro, S; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; Y. Kawamura; R. Fujii
Poster presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - The Spatial characteristics of the internal modulation of pulsating aurora: multi-point high-speed optical observations in Scandinavia
Kawamura, Y; K. Hosokawa; S. Oyama; Y. Miyoshi; Y. Ogawa; S. Kurita; S. Ebukuro; R. Fujii
Poster presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - Over-darkening pulsating aurora: simultaneous observations with Arase and an all-sky camera in Scandinavia
Hosokawa, K; Y. Miyoshi; S.-I. Oyama; Y. Ogawa; S. Kurita; Y. Kasahara; M. Ozaki; Y. Kasaba; S. Yagitani; S. Matsuda; F. Tsuchiya; A. Kumamoto; I. Shinohara; R. Fujii
Oral presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - A network of HF Doppler sounding systems in Japan
Hosokawa, K; H. Nakata; K. K. Hashimoto; I. Tomizawa; J. Sakai; T. Kikuchi; K. Nozaki
Poster presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - Observations of ionospheric and mesospheric wave structures by a low-cost airglow imaging system
Hosokawa, K; N. Kusuyama; Y. Hozumi; K. Takami; S. Saito; Y. Ogawa; M. Ishii; Y. Otsuka; T. Tsugawa
Poster presentation, English, JpGU Meeting, Makuhari, Japan, International conference
May 2019 - Estimation of the altitude of pulsating aurora
川村勇貴; 細川敬祐; 野澤悟徳; 小川泰信; 川端哲也; 藤井良一
Oral presentation, Japanese, EISCAT 研究集会, 国立極地研究所，立川, Domestic conference
Mar. 2019 - Creation of polar cap patches
Hosokawa, K; S. Taguchi; Y. Ogawa
Invited oral presentation, English, American Geophysical Union, Invited, International conference
16 Dec. 2014 - Patches and TOI from 4 years observations at Resolute Bay
Hosokawa, K
Invited oral presentation, English, Cusp and Polar Cap Ionosphere Present Knowledge and Future Planning, Invited, University of Oslo, Oslo, Norway, International conference
Apr. 2009 - PMSE observed with SuperDARN
Hosokawa, K
Invited oral presentation, English, Japan-China Scientific Cooperation Program sponsored by JSPS and NSFC Joint Seminor "Study on polar ionosphere-magnetosphere coupling", Invited, JSPS and NSFC, Tokyo, International conference
2008 - Motion of large-scale structures in the polar cap ionosphere
Hosokawa, K; K. Shiokawa; Y. Otsuka; T. Ogawa
Invited oral presentation, English, Asia-Oceania Geoscience Society (AOGS) 5th Annual General Meeting, Invited, Asia-Oceania Geoscience Society (AOGS), Busan, Korea, International conference
2008 - An interhemispheric comparison of Polar Mesosphere Summer Echoes (PMSE) as detected with conjugate SuperDARN radars
Hosokawa, K; T. Ogawa; N. F. Arnold; M. Lester; N. Sato; A. S. Yukimatu
Invited oral presentation, English, Greenland IPY 2007 Space Science Symposium (GSSS-2007), Invited, Kangerlussuaq, Greenland, Denmark, International conference
2007
Courses
- 宇宙通信工学特論
The University of Electro-Communications - 宇宙通信工学特論
電気通信大学 - 大学院技術英語
The University of Electro-Communications - 大学院技術英語
電気通信大学 - 情報・通信工学基礎
The University of Electro-Communications - 情報・通信工学基礎
The University of Electro-Communications - 情報・通信工学基礎
電気通信大学 - 情報通信システム実験第二A・B
The University of Electro-Communications - 基礎演習A
The University of Electro-Communications - 基礎電磁気学
The University of Electro-Communications - 物理学概論第一
The University of Electro-Communications - 物理学概論第一
電気通信大学 - 情報通信システム実験第二A・B
The University of Electro-Communications - 情報通信システム実験第二A・B
電気通信大学 - 宇宙通信工学
The University of Electro-Communications - 電磁気学第二
The University of Electro-Communications - 電磁気学第二
The University of Electro-Communications - 電磁気学第二
電気通信大学 - 宇宙通信工学
The University of Electro-Communications - 宇宙通信工学
電気通信大学 - 基礎演習A
The University of Electro-Communications - 基礎演習A
電気通信大学 - 解析電磁気学演習
The University of Electro-Communications - 解析電磁気学演習
The University of Electro-Communications - 解析電磁気学演習
電気通信大学 - 基礎電磁気学
The University of Electro-Communications - 基礎電磁気学
電気通信大学 - 解析電磁気学
The University of Electro-Communications - 解析電磁気学
The University of Electro-Communications - 解析電磁気学
電気通信大学
Affiliated academic society
Research Themes
- 極域熱圏加熱の起源の解明：光と電波を用いた統合高解像度イメージング観測
大山 伸一郎; 小川 泰信; 坂野井 健; 細川 敬祐
日本学術振興会, 科学研究費助成事業, 名古屋大学, 基盤研究(B), 本研究はオーロラによる極域熱圏の加熱（温度上昇）と膨張（上昇流発生と水平風加速）との関係を観測データから解き明かすことを目的としている。これまでの理論・シミュレーション研究によって、この加熱と膨張の定量的理解の根源は数十～百km規模（メソスケール）のオーロラと電離圏イオン速度の空間構造にあることが示された。しかし電離圏・熱圏・オーロラの同時高分解能観測（とりわけ熱圏観測）の難しさから、観測実証はできていない。 本事業の開始以降、北欧で運用する光学干渉計（FPI）、オーロラカメラ（ASI）、欧州非干渉散乱レーダー（EISCAT）を用いた観測実験を実施してきた。その活動で取得したデータとともに、過去10年以上にわたり蓄積された観測データの解析を行った。 本科研費予算を用いて北欧の観測施設を訪問し、メンテナンスを行うことで装置を最良の状態に維持した。その結果、継続的に良好なデータを取得できた。1-2年後に本格運用が始まるEISCAT_3Dレーダーとのより良い共同観測体制を構築するために、本科研費予算を使って人員を現地に派遣し、光学観測装置の設置拠点を移動させた。 観測実験およびアーカイブされたデータの解析研究から、例えば、熱圏風速の地磁気活動度と惑星間空間磁場に対する依存性、磁気嵐に伴う過去最大の風速を査読付き誌上論文に発表した。これら以外にも成果リストに記載したように多数の論文・学会発表を本科研費予算を用いて実施した。, 23K22554
01 Apr. 2022 - 31 Mar. 2027 - 極域熱圏加熱の起源の解明：光と電波を用いた統合高解像度イメージング観測
01 Apr. 2022 - 31 Mar. 2027 - 4D sensing of polar atmosphere: space/atmosphere coupling through meso-scale auroral phenomena
Keisuke Hosokawa
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (A), 22H00173
01 Apr. 2022 - 31 Mar. 2027 - 極冠域境界に見られる熱的現象の解明：アルベーン波の観測を通したアプローチ
01 Apr. 2022 - 31 Mar. 2026 - 光と電波を用いた国際共同観測によって明らかにするジオスペース電子降下の時空間変動
07 Oct. 2021 - 31 Mar. 2026 - ディフューズオーロラ現象が放射線帯高エネルギー電子降下に与える影響の解明
05 Apr. 2021 - 31 Mar. 2026 - Passive sounding of the ionosphere using radio waves for vessel traffic services
細川 敬祐
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Challenging Research (Exploratory), 23K17699
Jun. 2023 - Mar. 2026 - レーダ、カメラによる3D観測・解析を駆使したオーロラ3次元電流回路の高解像度復元
田中 良昌; 小川 泰信; 門倉 昭; 細川 敬祐; 津田 卓雄
日本学術振興会, 科学研究費助成事業, 国立極地研究所, 基盤研究(B), これまでに開発・改良してきた一般化オーロラトモグラフィ解析ツールを、2018年2月18日に北欧の3観測点の単色光全天イメージャ（波長427.8nm）で撮影されたパッチ状脈動オーロラに適用し、オーロラ発光強度の3次元分布、並びに、降下電子フラックスのエネルギー分布の時空間変動を復元した。得られた解析結果をノルウェー・トロムソのEISCATレーダーで同時観測された電離圏電子密度の高度プロファイルと比較し、本手法がオーロラ3次元分布を推定するのに有効であることを明らかにした。 上記パッチ状脈動オーロラに対して、さらに波長557.7nmの画像データを加えて解析を行い、電離圏電気伝導度の3次元分布を推定した。同様の手法を用いることにより、今後EISCAT_3Dレーダーによって電離圏の電場分布が得られれば、3次元電流系を推定することが可能となった。 冬季にノルウェー・シーボトンの多波長全天イメージャによるオーロラの連続観測を実施した。ノルウェー・トロムソ、スウェーデン・アビスコ、フィンランド・キルピスヤルビ等に設置されているWatecイメージャやEMCCDイメージャと合わせて、オーロラトモグラフィ解析に利用可能なデータを取得した。取得したデータを分野標準フォーマットであるCommon Data Format（CDF）に変換し、ウェブサイトで公開した。 シミュレーションにより、EISCAT_3Dレーダー・多点イメージャネットワーク観測による多層アークのモデルデータを作成し、一般化オーロラトモグラフィ解析の模擬実験を行った。これにより、本手法が多層アークの復元にも有効であることが示され、2023年冬季以降のEISCAT_3Dレーダー観測開始に合わせた共同研究の準備が整った。, 23K20876
01 Apr. 2021 - 31 Mar. 2025 - 静止軌道衛星ひまわりを活用した夜光雲の特性量推定と地上光学連携観測による検証
01 Apr. 2021 - 31 Mar. 2025 - レーダ、カメラによる3D観測・解析を駆使したオーロラ3次元電流回路の高解像度復元
01 Apr. 2021 - 31 Mar. 2025 - Imaging of radiation belt loss during plasmasphere extreme erosion
尾花 由紀; 坂口 歌織; 細川 敬祐; 能勢 正仁
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), ニュージーランドのミドルマーチ観測点では2011年よりフラックスゲート磁力計が稼働して地磁気三成分の1秒値観測が行われている。ここに新しく誘導磁力計と高感度全天カメラを設置し、ULF波、VLF波、オーロラ発光の同時観測体制を確立した。 このプロジェクトでは、放射線帯効果粒子による孤立オーロラの発光と、粒子降下を引き起こすイオンサイクロトロン(EMIC)波動を同時観測することで、地球にごく近い深内部磁気圏においてEMIC波動に起因する放射線帯消失が生じていることを立証し、さらに、地磁気嵐に伴うプラズマ圏の収縮と放射線帯消失の因果関係を解明することを目指している。 これまでのところ、波動とオーロラ発光の同時出現イベントは確認されていないが、Pc 1型地磁気脈動と電離層アルフベン共振器（Ionospheric Alfven Resonator, IAR）が観測された。2020年10月6日に観測されたPc 1はIPDP（Interval of Pulsations of Diminishing Period）タイプのPc 1であり、約3-4時間の周期的な間隔で4つのPc 1イベントが観察された。これらのイベントは、北半球にあるカナダとアイスランドの4つの観測点でも同時に観測されていた。またこれと継続するようにしてIARが発生していた。この日のIARのパワースペクトル密度は10月4日と5日のIARのそれよりも強く、Pc1からIARへの波動エネルギーの移行を示しているように見える。これらの結果は、これまでの研究で提案されているように、IARが雷放電からではなくPc1脈動からも励起エネルギーが供給される可能性を示しており興味深い。 これらの研究成果は地球電磁気・地球惑星圏学会講演会で発表されたほか、現在学術誌で発表するための論文を執筆中である。, 19H01958
01 Apr. 2019 - 31 Mar. 2024 - 国際宇宙ステーションから宇宙飛行士がデジカメで撮影した画像のオーロラ研究への活用
30 Jul. 2020 - 31 Mar. 2023 - 電磁波斜め伝搬効果とオーロラ4Dイメージングによる宇宙プラズマのエネルギー写像
01 Apr. 2020 - 31 Mar. 2023 - 多地点からの地上大気光観測を用いたプラズマバブル成長過程の解明
01 Apr. 2017 - 31 Mar. 2022 - 多地点からの電波リモートセンシング観測を用いた航空航法通信環境のリアルタイムモニタリング
村田学術振興財団研究助成
01 Dec. 2020 - 30 Nov. 2021 - 電波による極端自然現象の広域リモートセンシング
高橋経済産業研究財団
01 Apr. 2019 - 31 Mar. 2021 - 国際共同による観測ロケット実験を軸とした脈動オーロラ降下電子の研究
09 Oct. 2018 - 31 Mar. 2021 - 放送衛星に影響を与える宇宙嵐をモニタリングするシステムの開発と公開
放送文化基金
01 Apr. 2019 - 31 Mar. 2020 - 電波による極端自然現象の広域リモートセンシング
高橋経済産業研究財団
01 Apr. 2019 - 31 Mar. 2020 - スポラディックE層が航空航法に与える影響を広域にモニタリングするシステムの構築
01 Apr. 2018 - 31 Mar. 2020 - 極限時間分解能観測によるオーロラ最高速変動現象の解明
01 Apr. 2015 - 31 Mar. 2020 - 人工衛星電波を用いた電離圏シンチレーション観測のカスプ・極冠域への展開
01 Apr. 2016 - 31 Mar. 2019 - ＧＰＳシンチレーション観測による極域電離圏イレギュラリティの研究
01 Apr. 2016 - 31 Mar. 2019 - 3地点からの全天大気光撮像による極冠域電離圏広域イメージング観測
01 Apr. 2014 - 31 Mar. 2019 - High precision observation of ionosphere and neutral wind with new SuperDARN imaging technique
Yukimatu Akira Sessai; Sato Natsuo; Nishitani Nozomu; Hosokawa Keisuke; Kawano Hideaki; Watanabe Masakazu; Ogawa Tadahiko
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, National Institute of Polar Research, Grant-in-Aid for Scientific Research (B), This study could contribute to establishment of calibration methods for SuperDARN interferometry and led to more precise meteor neutral wind measurement and particularly near range echoes including neutral wind and PMSEs. This study also contributed to establishment and automation of new method for Pc5 FLR (field line resonance) detection with SuperDARN and also found a new type of geomagnetic pulsation phenomena. This also contributed to new discovery on morphology and generation mechanisms of Omega band and PMAA (poleward moving auroral arc) type aurora. This study also contributed to evaluation of solar flare influences on ionosphere and also detection of high energy particle precipitation into upper and middle atmopshere. Data with new imaging functionality could not be obtained unfortunately due to several unavoidable conditions at radar sites, but this study could still contribute to new science with new SuperDARN capabilities., 25287129
01 Apr. 2013 - 31 Mar. 2019 - 極域電離圏プラズマメソスケール密度構造のカスケード過程の解明
01 Apr. 2010 - 31 Mar. 2015 - International collaborative research of geospace by using EISCAT radar
FUJII Ryoichi; NOZAWA Satonori; MIYAOKA Hiroshi; OGAWA Yasunobu; OYAMA Shin-ichiro; SAKANOI Takeshi; FUJIWARA Hitoshi; MAEDA Sawako; TSUDA Takuo; HIRAHARA Masafumi; YUKIMATSU Akira; HOSOKAWA Keisuke; TANAKA Yoshimasa; TOKUMARU Munetoshi; ABE Takumi; MIYOSHI Yoshizumi; SHIOKAWA Kazuo; WATANABE Shigeto; ONO Takayuki
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nagoya University, Grant-in-Aid for Scientific Research (B), By using EISCAT radars located in northern Scandinavia and Svalbard together with other radars (MF and meteor) as well as several optical instruments (sodium LIDAR, all-sky imagers, FPI, photometer, narrow TV imagers), we have conducted a wide range of research on the geospace. Over the four years from April 2010 to March 2014, we conducted more than 40 special experiments (SPs) for 865 hours. Part of SPs were made as international collaborative experiments with other associate countries. We have obtained new findings about several topics: Cowling channel, polar cap patch, vertical oscillation of the polar ionosphere, ion-neutral collision frequency, auroral heating, travelling ionospheric disturbances. We have published 57 scientific papers. The EISCAT_3D radar is the next generation IS radar planed by the EISCAT community. We have discussed the EISCAT_3D project with Japanese colleagues as well as foreign colleagues, and have summarized a Japan's science plan using the EISCAT_3D., 22403010
01 Apr. 2010 - 31 Mar. 2014 - Conjugacy of auroras and their relationship to solar activity
SATO NATSUO; YAMAGISHI Hisao; KADOKURA Akira; OGAWA Yasunobu; YUKIMATU Akira; ONO Takayuki; HOSOKAWA Keisuke; TAGUCHI Makoto; OKANO Syoichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, National Institute of Polar Research, Grant-in-Aid for Scientific Research (B), Syowa Station in Antarctica and stations in Iceland form an ideal set of observatories to study geomagnetically conjugate auroras in the auroral zone. A campaign of conjugate auroral observations using all-sky TV cameras has been carried out during the equinox periods. We examined several types of auroras, e.g., beads aurora, auroral breakup, spirals, and pulsating aurora, checking for similarity and dissimilarity in terms of shapes, movements, and luminosity variations at both observatories. We assumed their generation region and mechanisms. We were also able to trace the temporal movements and displacement of the auroras in the Northern and Southern Hemispheres with a high spatial-temporal resolution. We discussed their conjugate characteristics with reference to solar wind-magnetosphere and magnetosphere-ionosphere coupling processes., 21403007
01 Apr. 2009 - 31 Mar. 2014 - Study of the upper atmosphere dynamics using highly sensitive multi-point optical instruments
SHIOKAWA Kazuo; OTSUKA Yuichi; SAITO Akinori; MIYOSHI Yoshizumi; MATSUOKA Ayako; HIRAHARA Masafumi; HOSOKAWA Keisuke; NOZAWA Satonori; OYAMA Shinichiro; OGAWA Yasunobu; IEDA Akimasa; NISHITANI Nozomu; ISHII Mamoru; KUBOTA Minoru; OGAWA Tadahiko; YAMAMOTO Mamoru
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nagoya University, Grant-in-Aid for Scientific Research (A), We have obtained various interesting results on the dynamical variations of the upper atmosphere at altitudes of 80-300 km using multi-point observation of nighttime airglow by 5 Fabry-Perot interferometers and more than 10 al-sky airglow imagers at Russia, Canada, Japan, Norway, Indonesia, Thailand, and Australia. Outstanding examples of the results are (1) various dynamical variations of medium-scale traveling ionospheric disturbances at subauroral latitudes, (2) evidence of duct propagation of small-scale gravity waves in the mesopause region, (3) evidence of a typhoon-induced small-scale gravity wave propagation to the mesopause region, and (4) relationship of eastward propagation of equatorial plasma bubbles and eastward thermospheric wind., 20244080
08 Apr. 2008 - 31 Mar. 2013 - 光学・電波観測を組み合わせたポーラーパッチの3次元イメージング観測
2011 - 2013 - 磁気圏・電離圏対流がオーロラ爆発に及ぼす影響の解明
2008 - 2010 - Multi-dimensional Simultaneous Observations of the Geospace-Ionosphere Phenomena using Low-Altitude Polar Satellites and Ground-Based Facilities
HIRAHARA Masafumi; ASAMURA Kazushi; YAMAZAKI Atsushi; SHINOHARA Iku; SAKANOI Takeshi; KASABA Yasumasa; OKANO Syoichi; MIYAOKA Hiroshi; KADOKURA Akira; OKADA Masaki; OGAWA Yasunobu; SAITO Akinori; NOZAWA Satonori; SEKI Kanako; SHIOKAWA Kazuo; IEDA Akimasa; KIKUCHI Takashi; OYAMA Shin-ichiro; EBIHARA Yusuke; TAGUCHI Makoto; HOSOKAWA Keisuke; WATARI Shinichi; MURATA Takeshi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Tokyo, Grant-in-Aid for Scientific Research (B), A micro-satellite of the Japanese mission was successfully launched from Baikonur Cosmodrome in Kazakhstan on August 23, 2005. We can simultaneously observe spatial distribution and time variation of fine aurora emissions associated with auroral electron precipitation and ionospheric ion outflows with a full pitch-angle coverage and a high-time resolution. Our Reimei team has also started some collaborative observations with EISCAT, all-sky cameras, and SuperDARN. Almost every new moon interval, we have been achieving simultaneous observations with Reimei and the ground-based instruments., 19403011
2007 - 2010 - High-time resolution optical observation of auroras in the Canadian arctic
OGAWA Tadahiko; SHIOKAWA Kazuo; IEDA Akimasa; NISHITANI Nozomu; HOSOKAWA Keisuke
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), We conduct two campaign observations of high-time resolution all-sky auroral imaging at multi-point stations in the Canadian arctic using 1/30-sec sampled cameras, in addition to the automated routine measurements of monochromatic all-sky cameras. We also combine these observations with the THEMIS satellite measurements. From these observations we obtain fine-scale structures and their development of auroras at the beginning of auroral substorms, as well as detailed characteristics of polar-cap plasma structures., 19403010
2007 - 2010 - Investigation on the Determinative Factors in the Spectral Structure of Thermospheric Gravity Wave Disturbances
SHIBATA Takashi; TOMIZAWA Ichiro; HOSOKAWA Keisuke; SUZUKI Shin
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), HFドップラ法による電離圏擾乱の多地点観測を進め、観測データの相関解析により、中規模AGW擾乱の水平速度分散特性をより詳細に検討した。散逸効果を加味した現実的熱圏大気中での数値解析結果と比較対照することにより、AGWスペクトルの構造を支配する要素の一つとして、波動振幅の鉛直方向特性に関係するマージナル条件が重要であることが示されている。また、電離圏擾乱データに対するバイスペクトル解析によって、熱圏中での非線形AGW3波共鳴の存在とその連鎖の様子を検出することに成功している。, 19540472
2007 - 2009 - Comprehensive research on magnetosphere -ionosphere-thermosphere-mesosphere coupling process using the EISCAT radars and other instruments
FUJII Ryoichi; NOZAWA Satonori; OYAMA Shin-ichiro; OGAWA Yasunobu; EBIHARA Yusuke; MAEDA Sawako; WATANABE Shigeto; FUJIWARA Hitoshi; TAKAHASHI Yukihiro; SAKANOI Takeshi; HIRAHARA Masafumi; ASAMURA Kazushi; HOSOKAWA Keisuke; MOTOBA Tetsuo; KOIZUMI Noriko; KAWAHARA Takuya
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nagoya University, Grant-in-Aid for Scientific Research (B), EISCAT radars are one of the greatest tools in the world for observing ionospheric phenomena in the auroral, polar cusp and cap regions. EISCAT radar systems provide us with essential physical parameters over the polar ionosphere. Solar-Terrestrial Environment Laboratory (STEL) has been playing a central role in promoting a variety of research projects using the ESR and KST radars of the EISCAT Scientific Association. Both STEL and NIPR, in collaboration with researchers across the nation, have conducted about 50 Special Program (SP) experiments such as Magnetosphere-Ionosphere coupling process using simultaneous observations by REIMEI satellite and EISCAT, DELTA-2 rocket campaign, vertical wind in the lower thermosphere, wind dynamics in the lower thermosphere, ion upflow, and aurora phenomena. In the result of these activities, 29 papers have been published for 4 years., 18403010
2006 - 2009 - Understanding of the dynamics of the plasmas in the magnetosphere and polar ionosphere through remote sensing
TAGUCHI Satoshi; HOSOKAWAHOSOKAWA Keisuke; NOSE Masahito; SUZUKI Shin; MURATA Yozo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), 地球の周辺の宇宙空間には電気を帯びた微粒子が存在しており, 様々な場所でそれぞれ固有の速さで動いている. 本研究では, その微粒子の一部が姿を変えた中性の粒子の運動を検出する撮像のデータを主に用いて, 電気を帯びた微粒子であるイオンの太陽風から磁気圏への直接的な流入, 地球磁気圏の外壁であるマグネトポーズの運動, 電離圏から磁気圏へと上昇するイオンの流れに関して, これまでに知られていない性質を見出した., 18540443
2006 - 2008 - Role of ionospheric process on the conjugate auroral dynamics and intensity
SATO Natsuo; YAMAGISHI Hisao; MIYAOKA Hiroshi; KADOKURA Akira; OKADA Masaki; ONO Takayuki; HOSOKAWA Keisuke; EJIRI Masaki; MOTOBA Tetsuo; TAGUCHI Makoto; EBIHARA Yusuke; TONEGAWA Yutaka; OKANO Shoichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, National Institute of Polar Research, Grant-in-Aid for Scientific Research (B), オーロラは南北両半球の極域で起こっているが、その形が似ている場合や全く異なる場合がある。南極昭和基地と北極域アイスランドは1 本の磁力線で結ばれた共役点ペアの位置関係にある。この利点を最大限活用してのオーロラの形状や動きを同時観測し、南北半球間の対称性・非対称性の特性を研究してきた。特に、爆発的オーロラ現象のオーロラ・ブレイクアップとその回復期に出現する点滅型の脈動オーロラに注目して観測研究を行なった。交付額, 17403009
2005 - 2008 - 大型短波レーダー観測網を用いた中間圏温度グローバルマップの導出
2005 - 2007 - Study on the characteristics of polar ionosphere, thermosphere and mesosphrere using SuperDARN HF radars
SATO Natsuo; KADOKURA Akira; OGAWA Tadahiko; NISHITANI Nozomu; TAGUCHI Satoshi; KEISUKE Hosokawa
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, National Institute of Polar Research, Grant-in-Aid for Scientific Research (B), The Super Dual Auroral Radar Network (SuperDARN) is a global-scale network for HF radars capable of sensing backscatter from ionospheric irregularities in the E and F-regions of the high-latitude ionosphere. Such HF radar network has been deployed in Arctic and Antarctic regions. SENSU Syowa East and South radars in Antarctica consist of this radar network. The HF radar Doppler velocity information contained in the backscattered signals has combined to yield maps of high-latitude plasma convection and the convection electric filed. Using the SuperDARN network data we studied various large-scale and meso-scale phenomena/dynamics observed in the polar ionosphere, which occur by the processes of the magnetosphere-ionosphere coupling, and produced following results; 1) Polar mesospheric summer echo (PMSE) phenomena has been detected in Antarctic region using the near range echo obtained by the SUNSE Syowa radars and we analyzed their statistical characteristics, 2) Finding new evidences that optical pulsating auroras are associated with the same period E-region electric fluctuations, 3) EISCAT heating experiment has 'conducted in association with Finland SuperDARN radar and EISCAT, and found fine interesting temporal-spatial characteristics, 4) Optical auroras in the Cusp region showed different types for generation region and generation condition, 5) We examined Ionospheric disturbances in conjugate hemispheres during the 23 November 2003 solar eclipse using magnetometer data obtained at Syowa and Dome-Fuji in Antarctica and their conjugate observatories in Iceland, Scandinavia and Greenland together with the SuperDARN BF radars, 7) Stereo-type radar system has been installed at Syowa radar. These scientific results have been presented in the international workshops/meetings and also published to international scientific journals., 16340148
2004 - 2007 - Study of polar ionosphere and magnetosphere dynamics based on SuperDARN time series analysis technique
TSUTSUMI Masaki; HOSOKAWA Keisuke; YUKIMATU Akira
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, National Institute of Polar Research, Grant-in-Aid for Scientific Research (C), In this study we upgraded the SuperDARN time series analysis technique [Yukimatu and Tsutsumi, 2002] by adding new capabilities to improve spatial resolutions, and also developed techniques to observe new targets such as meteors and polar mesosphere summer echoes. 1.Two techniques to improve the range resolution were newly added to the SuperDARN operating software; frequency domain interferometer(FDI) and oversampling. These techniques were first applied to meteor echo observations and proved to be useful for the study of polar mesosphere dynamics. It is notable that this meteor observation can be conducted together with the existing SuperDARN F-region observation and does not affect it at all. Network observation of polar mesosphere region is now being sought. The FDI technique was further applied to CUTLASS SuperDARN radars (Iceland and Finland) to study the minute spatial and time characteristics of irregularities which were generated by the ionosphere heating facility located at Tromso. 2.We started to develop a multi receiver imaging technique using Syowa station SuperDARN radars. A digital receiver was newly added to each of the 20 antenna outputs. Softwares to control these receivers are being developed to study fine structures of ionospheric echoes. 3.Polar mesosphere summer echoes (PMSEs) were studied by developing algorithms to detect them from near range data. Using 15 SuperDARN radars in Arctic and Antarctic regions, the occurrence rates of PMSEs were found to be different between Arctic and Antarctic and also show higher values with increasing latitudes., 16540410
2004 - 2006 - Highly Sensitive Optical Observations of Aurcraand Upper Atmosphere in the Canadian Arctic
OGAWA Tadahiko; SHIOKAWA Kazuo; OTSUKA Yuichi; IEDA Akimasa; NISHITANI Nozomu; HOSOKAWA Keisuke
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nagoya University, Grant-in-Aid for Scientific Research (B), Two all-sky airglow/aurora imagers were installed at two Canadian stations at Resolute Bay(RSB)and Athabasca observed polar-cap plasma patches almost always(ATH))in 2005, At RSB, we always during southward IMF periods, From two-dimensional cross-correlation analyses, we determined velocity vectors of the patches, which indicates the ionospheric convection vector, that showed high correlation with the IMF-By and -Bz variations. At ATH, we often observed isolated proton arcs and Stable Auroral Red (SAR) arcs, which were located equatorward of the amoral oval The appearance of the isolated proton arcs was highly correlated with the Pc 1 geomagnetic pulsations measured simultaneously at ATH, suggesting interactions between the electromagnetic ion cyclotron (EMK) waves and protons in the vicinity of the plasmapause and the ring current. Similar interactions without waves were also suggested for the SAR arcs, which appeared after the substorm expansion phase even without geomagnetic storm. These observations show promising capability monitor magnetospheric processes from the ground stations, whit would contribute to the future satellite projects such as THEMES, ERG, and Scope/Xscale, 16403007
2004 - 2006 - Study on the Solar Wind-Magnetosphere Interaction Based on Remote Sensing Data From IMAGE Spacecraft
TAGUCHI Satoshi; HOSOKAWA Keisuke
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), Observations by the Low Energy Neutral Atom (LENA) imager on the IMAGE spacecraft show that emission in the direction of the high-latitude magnetosheath is modulated in such a manner that the source shifts equatorward/poleward in the high-latitude sheath. A model based on the distributions of the sheath flux and of the number density of the hydrogen exosphere has explained these characteristics as a result of the motion of the magnetopause having an indentation at the cusp, suggesting a means for monitoring the cusp motion using IMAGE/LENA. Simultaneous observations from IMAGE/LENA and SuperDARN radar have given evidence for the means. Detailed analyses of an event of simultaneous observations from IMAGE and Polar have revealed that the high-latitude sheath emission consists of two parts : the stable emission at the higher-latitudes, and the lower-latitude emission that occurs on and off, and that that the entry of the cusp ions happens in concurrence with the appearance of the lower-latitude LENA emission. This strongly suggests that LENA monitors the entry of the ions in the cusp as well as the cusp indentation, and that the significant flux of the cusp ion entry occurs equatorward of, and separately from the cusp indentation. LENA also sometimes observes an enhanced emission in the direction of the very high-latitude magnetopause. Simultaneous observations from IMAGE/LENA and SuperDARN radar have shown that the LENA emission appears concurrently with the enhancement of the sunward flow of the reverse convection in the ionosphere. This shows that LENA can monitor the ion entry caused by cusp reconnection, and that the reconnection site moves on a time scale of several minutes. The reconnection "spot" mapped on a sphere having a radius of 8 Re shifts by approximately 1 Re over 10 minutes while fluctuating., 15540427
2003 - 2005
