Electron Pitch Angle Distributions in Compressional Pc5 Waves by THEMIS-A Observations
Electron Pitch Angle Distributions in Compressional Pc5 Waves by THEMIS-A Observations
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THEMIS-A 观测的压缩 Pc5 波中的电子螺距角分布
DOI：
10.1029/2021gl095730
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发表时间：
2021
影响因子：
5.2
通讯作者：
Wenya Li
中科院分区：
文献类型：
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作者：
Ma Xiao;Anmin Tian;Quanqi Shi;Shichen Bai;Shutao Yao;Xiao-Chen Shen;Weijie Sun;Ruilong Guo;Motoharu Nowada;Alex;er Degeling;Ji Liu;Li Li;Shuai Zhang;Wenya Li
虽然压缩Pc 5波在磁层中的带电粒子的能量转换和调节中是众所周知的，但是对相关电子俯仰角分布（ePAD）的详细特征知之甚少。基于2010 - 2016年的THEMIS观测数据，将压缩Pc 5波磁衰减（波谷）中的ePAD分为3种类型：雪茄型、蝴蝶型和薄饼型。它们在（非）哨声型压缩Pc 5波中的能量范围分别为100-1000 eV（大于10 keV）、1-10 keV（大于1 keV）和6-30 keV（100 eV-10 keV）的电子中被发现，即，在磁槽中存在（不存在）哨声模式波的情况。这些统计ePAD功能中观察到的哨声和非哨声型波建议与朗道共振哨声模式波和漂移壳分裂效应。
Although compressional Pc5 waves are well known in the energy conversion and regulation of charged particles in the magnetosphere, the detailed features of associated electron pitch angle distributions (ePADs) are poorly understood. Based on Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations from 2010 to 2016, ePADs in the magnetic decreases (troughs) of compressional Pc5 waves are classified into three types: cigar, butterfly, and pancake. They are found in the electrons with respective energy ranges of 100-1000 eV (larger than 10 keV), 1-10 keV (larger than 1 keV), and 6-30 keV (100 eV-10 keV) in (non)whistler-type compressional Pc5 waves, that is, cases where whistler-mode waves are present (absent) in the magnetic troughs. These statistical ePAD features observed in the whistler- and nonwhistler-type waves are suggested to be associated with the Landau resonance of whistler-mode waves and drift-shell splitting effect.