Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves
Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves
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DOI：
10.1029/2022ja031163
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Z. Yin;Xuzhi Zhou;Wen Li;X. Shen;R. Rankin;Ji Liu;Zejun Hu;Jianjun Liu;Q. Zong; Li
中科院分区：
文献类型：
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作者：
Z. Yin;Xuzhi Zhou;Wen Li;X. Shen;R. Rankin;Ji Liu;Zejun Hu;Jianjun Liu;Q. Zong; Li
最近提出的一种将磁层电子损失到大气中的机制是在这项研究中直接由超频率（ULF）波驱动的机制，我们定量分析了ULF波诱导的降水的性能，通过模拟电子弹跳和在电动领域中激发的磁性磁场中的电子反射和漂移。磁层会导致跨场能量增强，并降低镜像的高度。地面仪器。
A mechanism recently proposed for magnetospheric electron loss into the atmosphere is the precipitation directly driven by ultralow‐frequency (ULF) waves. In this study, we quantitatively analyze the properties of ULF wave‐induced precipitation by simulating the electron bounce and drift motion in poloidal‐mode waves excited in a dipole magnetic field. Our results reveal that precipitation occurs only when electrons encounter a westward‐directed wave electric field in the magnetosphere, which leads to cross‐field energy enhancements and reduces their mirror heights. The simulations also demonstrate longer duration electron precipitation at the drift‐resonance energy. We calculate the temporal variations of the energy spectrum for precipitating electrons and the total precipitating energy fluxes. These results improve our understanding of ULF wave‐induced electron precipitation as well as provide a point of comparison for observations from balloons or ground‐based instruments.