[P-EM13] 内部磁気圏

[PEM13-07] Electron scattering by isolated chorus elements observed near the magnetospheric equator

★Invited Papers

*笠原 慧¹、三好 由純²、横田 勝一郎³、笠原 禎也⁴、松田 昇也⁵、松岡 彩子⁵、桂華 邦裕¹、堀 智昭²、篠原 育⁵ (1.東京大学、2.名古屋大学、3.大阪大学、4.金沢大学、5.宇宙科学研究所)

キーワード：ピッチ角散乱、コーラス波動

Theories have predicted significant pitch angle scattering of electron by chorus waves via cyclotron resonance, resulting in electron precipitation into the atmosphere and consequent auroral illumination. Recent observations of chorus waves at the equator, in conjunction with ground observations, have indicated that even a single chorus element can cause sufficient electron scattering causing auroral flashing. Here we report more direct, in-situ evidence that electrons are indeed scattered into the loss cone up to strong diffusion, by an isolated chorus element. We discuss the scattering rate based on the observed parameters.