Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes
Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes
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DOI：
10.1029/2021ja029644
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发表时间：
2021-08
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通讯作者：
Q. Ma;Wen Li;X.‐J. Zhang;J. Bortnik;X. Shen;H. Connor;A. Boyd;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence
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作者：
Q. Ma;Wen Li;X.‐J. Zhang;J. Bortnik;X. Shen;H. Connor;A. Boyd;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence
我们介绍了由于等离子体层和羽流中的希斯波而从赤道磁层中产生的高能电子沉淀的全球概况。利用Van Allen探针测量，我们计算了反弹损失锥处的俯仰角扩散系数，并估算了沉淀电子通量的能谱。我们∼6.5年的观测表明，在扰动期间，等离子体层内的嘶嘶声主要引起L和GT；4超过8h 5超过8h 4超过14h<；MLT<；20h的电子降水。降水能通量随着地磁活动的增加而增加，并且等离子体层羽流中的能量通量通常比等离子体层中的高。从L=6的∼20keV到L=3时的∼100keV，降水的特征能量增加，可能导致几百keV的电子损失。
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 5 over 8 h 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.