Statistical Analysis of Transverse Size of Lower Band Chorus Waves Using Simultaneous Multisatellite Observations
Statistical Analysis of Transverse Size of Lower Band Chorus Waves Using Simultaneous Multisatellite Observations
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DOI：
10.1029/2019gl083118
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发表时间：
2019-06
影响因子：
5.2
通讯作者：
X. Shen;Wen Li;Q. Ma;O. Agapitov;Y. Nishimura
中科院分区：
文献类型：
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作者：
X. Shen;Wen Li;Q. Ma;O. Agapitov;Y. Nishimura
众所周知，合唱波可以通过地球磁层中的准线性或非线性波粒相互作用来加速或散射高能电子。在这封信中，通过利用范艾伦探测器和/或亚暴期间事件和宏观相互作用的时间历史（THEMIS）任务中至少一对探测器对合唱波形的同时观测，我们统计计算了较低频带合唱波元素的横向尺寸。在 ~5-6 的 L 壳上，低频带合唱波单元的平均尺寸为 ~315±32 km。此外，我们的结果表明，较低频段合唱的音阶尺寸往往会（1）在较高 L 的壳处较大； (2) 在较高磁纬度处较大，尤其是在阳侧； (3)方位角方向比径向大。我们的发现对于量化波粒相互作用过程至关重要，特别是合唱团和高能电子之间的非线性相互作用。
Chorus waves are known to accelerate or scatter energetic electrons via quasi‐linear or nonlinear wave‐particle interactions in the Earth's magnetosphere. In this letter, by taking advantage of simultaneous observations of chorus waveforms from at least a pair of probes among Van Allen Probes and/or Time History of Events and Macroscale Interactions during Substorms (THEMIS) missions, we statistically calculate the transverse size of lower band chorus wave elements. The average size of lower band chorus wave element is found to be ~315±32 km over L shells of ~5–6. Furthermore, our results suggest that the scale size of lower band chorus tends to be (1) larger at higher L shells; (2) larger at higher magnetic latitudes, especially on the dayside; and (3) larger in the azimuthal direction than in the radial direction. Our findings are crucial to quantify wave‐particle interaction process, particularly the nonlinear interactions between chorus and energetic electrons.