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Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes
Journal of Geophysical Research: Space Physics ( IF 2.6 ) Pub Date : 2021-07-21 , DOI: 10.1029/2021ja029644
Q. Ma 1, 2 , W. Li 1 , X. ‐J. Zhang 2, 3 , J. Bortnik 2 , X. ‐C. Shen 1 , H. K. Connor 4 , A. J. Boyd 5 , W. S. Kurth 6 , G. B. Hospodarsky 6 , S. G. Claudepierre 2, 5 , G. D. Reeves 7, 8 , H. E. Spence 9
Affiliation  

We present a global survey of energetic electron precipitation from the equatorial magnetosphere due to hiss waves in the plasmasphere and plumes. Using Van Allen Probes measurements, we calculate the pitch angle diffusion coefficients at the bounce loss cone, and evaluate the energy spectrum of precipitating electron flux. Our ∼6.5-year survey shows that, during disturbed times, hiss inside the plasmasphere primarily causes the electron precipitation at L > 4 over 8 h < MLT < 18 h, and hiss waves in plumes cause the precipitation at L > 5 over 8 h < MLT < 14 h and L > 4 over 14 h < MLT < 20 h. The precipitating energy flux increases with increasing geomagnetic activity, and is typically higher in the plasmaspheric plume than the plasmasphere. The characteristic energy of precipitation increases from ∼20 keV at L = 6–∼100 keV at L = 3, potentially causing the loss of electrons at several hundred keV.

中文翻译:

由地球等离子层和羽流中的希斯波引起的电子降水的全球调查

我们对由于等离子体层和羽流中的嘶嘶声波引起的赤道磁层高能电子沉淀进行了全球调查。使用 Van Allen Probes 测量,我们计算了反弹损耗锥处的俯仰角扩散系数,并评估了沉淀电子通量的能谱。我们大约 6.5 年的调查表明,在扰动时期,等离子体层内部的嘶嘶声主要导致 8 小时内L > 4的电子沉淀< MLT < 18 小时,羽流中的嘶嘶声导致L  > 5 超过 8 小时的降水< MLT < 14 小时和L > 4 超过 14 小时 < MLT < 20 小时。沉淀能量通量随着地磁活动的增加而增加,并且通常在等离子层羽流中高于等离子层。的在从约20千电子伏降水增加特征能量大号 = 6-〜100 keV的大号 = 3,有可能导致在几百千电子伏的电子的损失。
更新日期:2021-08-09
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