SM025-05
Plasma Waves Causing Relativistic Electron Precipitation Events at International Space Station: Lessons from Conjunction Observations with Arase Satellite

Thursday, 10 December 2020: 19:16
Virtual
Ryuho Kataoka1, Yoichi Asaoka2, Shoji Torii2, Satoshi Nakahira3, Haruka Ueno4, Shoko Miyake5, Yoshizumi Miyoshi6, Satoshi Kurita7, Masafumi Shoji6, Yoshiya Kasahara8, Mitsunori Ozaki8, Syoya Matsuda9, Ayako Matsuoka10, Yasumasa Kasaba11, Iku Shinohara12, Keisuke Hosokawa13, Herbert Akihito Uchida14, Kiyoka Murase14 and Yoshimasa Tanaka15, (1)NIPR National Institute of Polar Research, Tokyo, Japan, (2)Waseda University, Tokyo, Japan, (3)JAXA, Kanagawa, Japan, (4)Japan Aerospace Exploration Agency, Tokyo, Japan, (5)Tokiwa University, Mito, Ibaraki, Japan, (6)ISEE, Nagoya University, Nagoya, Japan, (7)Kyoto University, Research Institute for Sustainable Humanosphere, Kyoto, Japan, (8)Kanazawa University, Kanazawa, Japan, (9)ISAS/JAXA, Sagamihara, Japan, (10)Kyoto University, Kyoto, Japan, (11)Tohoku University, Sendai, Japan, (12)JAXA Japan Aerospace Exploration Agency, ISAS, Sagamihara, Japan, (13)Univ Electro-Communications, Chofu, Japan, (14)SOKENDAI Graduate University for Advanced Studies, Tachikawa, Japan, (15)NIPR, Tokyo, Japan
Recorded Presentation
Abstract:
We report three different types of relativistic electron precipitation (REP) events observed at International Space Station (ISS), associated with electromagnetic ion cyclotron (EMIC) waves or whistler mode waves as observed by the Arase satellite at conjugate locations near the magnetic equator. Three different detectors installed on the ISS were complementarily used; CALET/CHD as the detector of precipitating MeV electrons, MAXI/RBM as the detector of sub-MeV electrons from horizontal and vertical directions, and SEDA-AP/SDOM to quantitatively measure the energy spectrum. The REP event on August 21, 2017 shows a quasi-periodic intensity variation at ~1 Hz which corresponds to variations of the EMIC waves at the Arase altitudes. The REP event on April 24, 2017 shows rapid and irregular intensity variation which corresponds to the amplitude variation of chorus waves, while the REP events on October 26, 2017 shows a smooth quasi-periodic time variation at ~0.2 Hz which corresponds to the amplitude variation of “electrostatic” whistler mode waves. This study clearly demonstrates that the time variation of REP events at ISS are caused by various types of plasma waves near the magnetic equator.
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