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• Active auroral arc powered by accelerated electrons from very high altitudes

  Imajo S., Miyoshi Y., Kazama Y., Asamura K., Shinohara I., Shiokawa K., Kasahara Y., Kasaba Y., Matsuoka A., Wang S.Y., Tam S.W.Y., Chang T.‑., Wang B.‑., Angelopoulos V., Jun C.W., Shoji M., Nakamura S., Kitahara M., Teramoto M., Kurita S., Hori T.

  Scientific Reports    11 ( 1 )   2021年12月  [査読有り]

   概要を見る

  © 2021, The Author(s). Bright, discrete, thin auroral arcs are a typical form of auroras in nightside polar regions. Their light is produced by magnetospheric electrons, accelerated downward to obtain energies of several kilo electron volts by a quasi-static electric field. These electrons collide with and excite thermosphere atoms to higher energy states at altitude of ~ 100 km; relaxation from these states produces the auroral light. The electric potential accelerating the aurora-producing electrons has been reported to lie immediately above the ionosphere, at a few altitudes of thousand kilometres1. However, the highest altitude at which the precipitating electron is accelerated by the parallel potential drop is still unclear. Here, we show that active auroral arcs are powered by electrons accelerated at altitudes reaching greater than 30,000 km. We employ high-angular resolution electron observations achieved by the Arase satellite in the magnetosphere and optical observations of the aurora from a ground-based all-sky imager. Our observations of electron properties and dynamics resemble those of electron potential acceleration reported from low-altitude satellites except that the acceleration region is much higher than previously assumed. This shows that the dominant auroral acceleration region can extend far above a few thousand kilometres, well within the magnetospheric plasma proper, suggesting formation of the acceleration region by some unknown magnetospheric mechanisms.

  DOI Scopus

• Multi‐event study of characteristics and propagation of naturally occurring ELF/VLF waves using high‐latitude ground observations and conjunctions with the Arase satellite

  C. Martinez‐Calderon Y. Katoh J. Manninen O. Santolik Y. Kasahara S. Matsuda A. Kumamoto F. Tsuchiya A. Matsuoka M. Shoji M. Teramoto I. Shinohara K. Shiokawa Y. Miyoshi

  Journal of Geophysical Research: Space Physics      2021年01月  [査読有り]

• Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

  Fukizawa M., Sakanoi T., Miyoshi Y., Kazama Y., Katoh Y., Kasahara Y., Matsuda S., Matsuoka A., Kurita S., Shoji M., Teramoto M., Imajo S., Sinohara I., Wang S.Y., Tam S.W.Y., Chang T.F., Wang B.J., Jun C.W.

  Geophysical Research Letters    47 ( 23 )   2020年12月  [査読有り]

   概要を見る

  ©2020. American Geophysical Union. All Rights Reserved. Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high-pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.

  DOI Scopus

• Long‐Term Monitoring of Energetic Protons at the Bottom of Earth’s Radiation Belt

  Yoshioka Y. Miyoshi S. Kurita M. Teramoto F. Tsuchiya A. Yamazaki G. Murakami T. Kimura H. Kita I. Yoshikawa Y. Kasaba

  Space Weather      2020年12月  [査読有り]

  DOI

• Inner Magnetospheric Response to the Interplanetary Magnetic Field By Component: Van Allen Probes and Arase Observations

  N. A. Case D. P. Hartley A. Grocott Y. Miyoshi A. Matsuoka S. Imajo S. Kurita I. Shinohara M. Teramoto

  Journal of Geophysical Research: Space Physics      2020年12月  [査読有り]

  DOI

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• Educational and research activities of nanosatellite technologies at the Kyusyu Institute of Technology

  Mariko Teramoto, Mengu Chom Hirokazu Masui, Sangkyun Kim, Takashi Yamauchi, Necmi Chihan Orger, George Maeda  [招待有り]

  43rd COSPAR Scientific Assembly  2021年01月  -  2021年02月   

• Data assimilation of electron radiation belts : estimation of radial diffusion coefficients and life times

  Yoshizumi Miyoshi, Genta Ueno, Takefumi Mitani, Takeshi Takashima, Iku Shinohara, Nana Higashio, Tomoaki Hori, Satoshi Kurita, Mariko Teramoto

  43rd COSPAR Scientific Assembly  2021年01月  -  2021年02月   

• Observations of radiation belt by Arase during declining phase of cycle 24

  Yoshizumi Miyoshi, Satoshi Kurita, Tomoaki Hori, Syun Imajo, Mariko Teramoto, Takafumi Mitani, Takeshi Takashima, Iku Shinohara, Nana Higashio, Satoshi Kasahara, Shoichiro Yokota, Kunihiro Keika, Fuminori Tsuchiya, Atsushi Kumamoto, Yoshiya Kasahara, Masafumi Shoji, Satoko Nakamura, Ayako Matsuoka

  43rd COSPAR Scientific Assembly  2021年01月  -  2021年02月   

• Modulation of energy transfer between hot protons and electromagnetic ion cyclotron waves by compressional Pc5 ULF waves

  Naritoshi Kitamura, Masafumi Shoji, Masahiro Kitahara, Satoko Nakamura, Takanobu Amano, Yoshiharu Omura, Yoshizumi Miyoshi, Hiroshi Hasegawa, Yuto Katoh, Yoshifumi Saito, Mariko Teramoto, Reiko Nomura, Shoichiro Yokota, Daniel J Gershman, Scott A Boardsen, Adolfo F. Vinas, Barbara L Giles, William R Paterson, Craig J Pollock, Christopher T Russell, Robert J Strangeway, Narges Ahmadi, Per-Arne Lindqvist, Robert Ergun, Stephen A Fuselier, James L Burch

  AGU Fall meeting 2020  2020年12月  -  2020年12月   

• An event study of the M-I-T coupling at a pseudo breakup during geomagnetically quiet conditions

  Shin-ichiro Oyama, Atsuki Shinbori, Yasunobu Ogawa, Mirjam Kellinsalmi, Tero Raita, Michael T Rietveld, Anita Taina Aikio, Heikki Vanhamaki, Kazuo Shiokawa, Ilkka I Virtanen, Lei Cai, Abiyot Workayehu, Marcus Pedersen, Kirsti Kauristie, Takuo T Tsuda, Boris V Kozelov, Andrei G Demekhov, Alexander G Yahnin, Fuminori Tsuchiya, Atsushi Kumamoto, Yoshiya Kasahara, Ayako Matsuoka, Masafumi Shoji and Mariko Teramoto

  AGU Fall meeting 2020  2020年12月  -  2020年12月   

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• 井上研究奨励賞

  2013年02月   井上科学振興財団   日本国

  受賞者：  寺本万里子

• 学生発表賞

  2007年03月   地球電磁気・地球惑星圏学会   日本国

  受賞者：  寺本万里子

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