Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

Mon. May 21, 2018 10:45 AM - 12:15 PM 303 (3F International Conference Hall, Makuhari Messe)

convener:Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Keisuke Hosokawa(電気通信大学大学院情報理工学研究科, 共同), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Chairperson:Hosokawa Keisuke(The University of Electro-Communications), Miyoshi Yoshizumi(ISEE, Nagoya University)

10:45 AM - 11:00 AM

[PEM16-01] Energetic electron acceleration and precipitations associated with chorus waves; Arase observations

*Yoshizumi Miyoshi1, Shinji Saito1, Satoshi Kurita1, Yoshiya Kasahara2, Shoya Matsuda1, Fuminori Tsuchiya3, Atsushi Kumamoto3, Ayako Matsuoka4, Nana Higashio4, Takefumi Mitani4, Takeshi Takashima4, Satoshi Kasahara5, Shoichiro Yokota6, Kazushi Asamura4, Iku Shinohara4, Kazuo Shiokawa1, Yasunobu Ogawa7, Keisuke Hosokawa8, Shin-ichiro Oyama1, Tomoaki Hori1, Masafumi Shoji1, Mariko Teramoto1, Tzu-Fang Chang1, Esa Turunen9 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Kanazawa University, 3.Tohoku University, 4.JAXA, 5.The University of Tokyo, 6.Osaka University, 7.NIPR, 8.UEC, 9.SGO, Finland)

Keywords:Radiation Belts, Precipitation, wave-particle interactions

The whistler mode chorus waves work dual role for the acceleration and precipitation of energetic electrons. The Arase satellite that was launched in December, 2016 has obtained comprehensive data sets for plasma/particles and fields/waves. In March and April, 2017, the Arase satellite observed several magnetic disturbances driven by CIR and subsequent coronal hole streams. During the period, the Arase satellite observed continuous chorus activities for a few days associated with the high-speed solar wind. During this period, comprehensive observations from the Arase satellite and ground-based observations are realized. EISCAT at Tromso, Norway observed strong ionization at the low altitude, indicating sub-relativistic electrons of the radiation belts precipitate into the atmosphere. During the period, the Arase satellite successfully observed intense chorus waves outside the plasmapause, indicating the resonance with chorus waves causes the pitch angle scattering of energetic electrons. Simultaneously, large flux enhancement of the outer belt electrons was observed with enhancement of chorus waves. We discuss the dual role that chorus waves play in controlling the dynamics of the radiation belts.