DOI: 10.1002/2017JA024873
Scopus记录号: 2-s2.0-85044518006
论文题名: Pitch Angle Dependence of Energetic Electron Precipitation: Energy Deposition, Backscatter, and the Bounce Loss Cone
作者: Marshall R.A. ; Bortnik J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2412
结束页码: 2423
语种: 英语
英文关键词: loss cone
; pitch angle
; precipitation
; radiation belts
英文摘要: Quantifying radiation belt precipitation and its consequent atmospheric effects requires an accurate assessment of the pitch angle distribution of precipitating electrons, as well as knowledge of the dependence of the atmospheric deposition on that distribution. Here Monte Carlo simulations are used to investigate the effects of the incident electron energy and pitch angle on precipitation for bounce period time scales, and the implications for both the loss from the radiation belts and the deposition in the upper atmosphere. Simulations are conducted at discrete energies and pitch angles to assess the dependence on these parameters of the atmospheric energy deposition profiles and to estimate the backscattered particle distributions. We observe that the atmospheric response is both energy and pitch angle dependent. These effects together result in an energy-dependent bounce loss cone angle, which can vary by 2–3° with particle energy when considered at low-Earth orbit. This modeling also predicts that a significant fraction of the input electron distribution will be backscattered and should be observable by low-Earth-orbiting satellites as field-aligned beams emerging from the atmosphere at energies lower than the input distribution and having pitch angles distributed just inside the loss cone. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114316
Appears in Collections: 气候减缓与适应
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作者单位: Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Marshall R.A.,Bortnik J.. Pitch Angle Dependence of Energetic Electron Precipitation: Energy Deposition, Backscatter, and the Bounce Loss Cone[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)