Study on nonlinear ion dynamics in electromagnetic ion cyclotron wave emissions

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800256
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: Nagoya University
• Principal Investigator: Shoji Masafumi 名古屋大学, 宇宙地球環境研究所, 特任助教 (80722082)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 非線形波動粒子相互作用 / 地球内部磁気圏 / 計算機シミュレーション

Outline of Final Research Achievements

We performed computer simulations on nonlinear interactions between electromagnetic ion cyclotron (EMIC) waves and high energy ions and relativistic electrons in the Earth's magnetosphere. The EMIC rising tone emissions with different spectrum characteristics are successfully reproduced in the simulations. The efficiency and time scale of the scattering and acceleration of protons are controlled by the wave spectra. The large amount of relativistic electrons with wide energy range are also scattered by the waves. We also performed the simulations with longitudinal electric fields, reproducing the EMIC falling tone emissions. We show that these plasma phenomena are conducted by the nonlinear wave particle interactions.

Free Research Field

宇宙プラズマ物理学