Bursty Energetic Electron Precipitation by High‐Order Resonance With Very‐Oblique Whistler‐Mode Waves
Bursty Energetic Electron Precipitation by High‐Order Resonance With Very‐Oblique Whistler‐Mode Waves
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DOI：
10.1029/2022gl101920
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发表时间：
2023-04
影响因子：
5.2
通讯作者：
L. Gan;A. Artemyev;Wen Li;Xiao‐jia Zhang;Q. Ma;D. Mourenas;V. Angelopoulos;E. Tsai;C. Wilkins
中科院分区：
文献类型：
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作者：
L. Gan;A. Artemyev;Wen Li;Xiao‐jia Zhang;Q. Ma;D. Mourenas;V. Angelopoulos;E. Tsai;C. Wilkins
与惠斯勒模式波的谐振相互作用是我们研究的最重要的驱动器之一。在共轭磁性方程的情况下，我们观察到的测试粒子模拟的卫星表明，尤其是高于100 keV的电子降水量导致高阶谐音散射是由非常稳定的惠斯勒 - 模板散布的，我们的研究只能散发出高度的降水量。长期扩散模型，也是在短时间事件的模型中。
Resonant interactions with whistler‐mode waves are one of the most important drivers for rapid energetic electron precipitation. In this letter, we study a conjunction event, where bursts of energetic electron precipitation (50–800 keV) with timescales of several seconds are observed by the twin ELFIN Cubesats at low Earth orbit, while very‐oblique intense whistler‐mode waves are observed by the Time History of Events and Macroscale Interactions during Substorms E satellite at the conjugate magnetic equator. Our observation‐constrained test‐particle simulations reveal that the electron precipitation, particularly above 100 keV, results from high‐order resonant scattering by the very‐oblique whistler‐mode waves. Our study provides the first direct evidence for high‐order resonance driven precipitation, explaining a bursty precipitation event. The results demonstrate that high‐order resonant scattering could be important, not only in long‐term diffusion models, but also in models of short timescale events.