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Plasma Waves Causing Relativistic Electron Precipitation Events at International Space Station: Lessons From Conjunction Observations With Arase Satellite
Author(s) -
Kataoka Ryuho,
Asaoka Yoichi,
Torii Shoji,
Nakahira Satoshi,
Ueno Haruka,
Miyake Shoko,
Miyoshi Yoshizumi,
Kurita Satoshi,
Shoji Masafumi,
Kasahara Yoshiya,
Ozaki Mitsunori,
Matsuda Shoya,
Matsuoka Ayako,
Kasaba Yasumasa,
Shinohara Iku,
Hosokawa Keisuke,
Uchida Herbert Akihito,
Murase Kiyoka,
Tanaka Yoshimasa
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja027875
Subject(s) - physics , electron precipitation , van allen radiation belt , amplitude , whistler , electron , equator , computational physics , nuclear physics , magnetosphere , plasma , optics , astronomy , latitude
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 21 August 2017 shows a quasiperiodic intensity variation at ~1 Hz which corresponds to variations of the EMIC waves at the Arase altitudes. The REP event on 24 April 2017 shows rapid and irregular intensity variation which corresponds to the amplitude variation of chorus waves, while the REP events on 26 October 2017 shows a smooth quasiperiodic 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.