日本地球惑星科学連合2018年大会

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

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

2018年5月22日(火) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:Danny Summers(Memorial University of Newfoundland)、三好 由純(名古屋大学宇宙地球環境研究所)、細川 敬祐(電気通信大学大学院情報理工学研究科、共同)、海老原 祐輔(京都大学生存圏研究所)

[PEM16-P20] Electric field disturbances observed by THEMIS mission at dipolarization sites in the magnetotail

*Kaiti Wang1Ching-Huei Lin2Tohru Hada3Fumiko Otsuka3Tai-Yuan Wang1Shi-Hung Chuang Yang1Michael D. Hartinger4John W. Bonnell5 (1.Tamkang Univ.、2.Chien-Hsin Univ.、3.Kyushu Univ.、4.Virginia Tech.、5.UC Berkeley)

キーワード:THEMIS mission, electric fields, dipolarization

The electric fields measured at dipolarization sites when geomagnetic AL index decreases in the inner plasma sheet from 2008 to 2011 by the Electric Field Instrument (EFI) of THEMIS mission were analyzed and some cases show that the electric fields are disturbed with wave-like signatures. Preliminary results show that the frequencies of these disturbances are found to be between proton gyrofrequency (fcH+) and half of the electron gyrofrequency (fce), so possibly to be whistler-mode and lower-hybrid waves.

In this study, the wave properties of these fields will be investigated in detail. Since electric fields have been suggested to be able to accelerate electrons and can be a significant non-adiabatic acceleration mechanism for particles during dipolarization, acceleration of electrons and scattering in their pitch angles by these observed field disturbances will also be evaluated. This will be beneficial to our understanding on the role of the electric field disturbances play on electrons during dipolarization.