論文の公開元へ斜め伝搬ホイッスラーモード波動粒子相互作用のテスト粒子シミュレーション
概要
研究目的 (Research Objective):
The energetic electron precipitation (EEP) induced by chorus waves is the main cause ofpulsating auroras and one of the processes removing energetic electrons from the Earth's outerradiation belt. Several simulations provided direct evidence showing the chorus-driven EEP (i.e., Rosenberg et al. (1990), Hikishima et al. (2010), and Miyoshi et al. (2010)). However, thesimulations are all under the parallel propagation assumption. Oblique whistler modewave-particle interactions accelerate electrons and lower their equatorial pitch angles viaLandau resonance efficiently. Landau resonance does not occur in parallel wave-particleinteractions. Based on this phenomenon, the Landau resonance should contribute to theprecipitation of 10–100 keV electrons or even relativistic electrons. From in situ observations,there are many events of oblique chorus emissions in the Earth’s magnetic field. The relationbetween chorus-driven EEP and the Landau resonance has not been clarified yet. In this studywe check the process of oblique chorus induced EEP and how important the wave normalangles contribute to the precipitation by test-particle simulations.
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