Global Survey of Plasma Sheet Electron Precipitation due to Whistler Mode Chorus Waves in Earth's Magnetosphere
Global Survey of Plasma Sheet Electron Precipitation due to Whistler Mode Chorus Waves in Earth's Magnetosphere
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DOI：
10.1029/2020gl088798
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
Q. Ma;H. Connor;X.‐J. Zhang;W. Li;X. Shen;D. Gillespie;C. Kletzing;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence
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作者：
Q. Ma;H. Connor;X.‐J. Zhang;W. Li;X. Shen;D. Gillespie;C. Kletzing;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence
惠斯勒模式合唱波可以将等离子体薄片电子散射到损耗锥体中，产生地球上弥漫的极光。2012年11月24日，范艾伦探测器观测到了等离子体薄片电子注入和强烈的合唱波。我们用拟线性理论计算了沉淀电子的通量，证明了和弦波可以产生特征能量为10-30keV的高微分能通量的沉淀电子。利用该方法，我们计算了2012-2019年Van Allen探测器在磁赤道附近时的降水电子通量，并对不同地磁条件下的电子降水进行了全球调查。由于大合唱而产生的最显著的电子降水出现在4<；L&6.5以上的夜间至黎明时段。在扰动条件下，平均总降水能量通量增加，当AE≥为500nT时，时间平均值达到~3~10erg/cm~2/S。
Whistler mode chorus waves can scatter plasma sheet electrons into the loss cone and produce the Earth's diffuse aurora. Van Allen Probes observed plasma sheet electron injections and intense chorus waves on 24 November 2012. We use quasilinear theory to calculate the precipitating electron fluxes, demonstrating that the chorus waves could lead to high differential energy fluxes of precipitating electrons with characteristic energies of 10–30 keV. Using this method, we calculate the precipitating electron flux from 2012 to 2019 when the Van Allen Probes were near the magnetic equator and perform global surveys of electron precipitation under different geomagnetic conditions. The most significant electron precipitation due to chorus is found from the nightside to dawn sectors over 4 < L < 6.5. The average total precipitating energy flux is enhanced during disturbed conditions, with time‐averaged values reaching ~3–10 erg/cm2/s when AE ≥ 500 nT.