DOI: 10.1002/2016GL067938
论文题名: Quasi-linear simulations of inner radiation belt electron pitch angle and energy distributions
作者: Albert J.M. ; Starks M.J. ; Horne R.B. ; Meredith N.P. ; Glauert S.A.
刊名: Geophysical Research Letters
ISSN: 0094-9184
EISSN: 1944-8915
出版年: 2016
卷: 43, 期: 6 起始页码: 2381
结束页码: 2388
语种: 英语
英文关键词: pitch angle distributions
Scopus关键词: Diffusion
; Radiation belts
; Electron pitch angle
; Energy distributions
; Inner radiation belts
; Magnetosonic waves
; Pitch angle distribution
; Transmitter signals
; Two dimensional diffusion
; Ultrarelativistic energies
; Atmospherics
; electron
; energy balance
; energy flux
; observational method
; radial diffusion
; simulation
; statistical analysis
; Pachycephalidae
英文摘要: "Peculiar" or "butterfly" electron pitch angle distributions (PADs), with minima near 90°, have recently been observed in the inner radiation belt. These electrons are traditionally treated by pure pitch angle diffusion, driven by plasmaspheric hiss, lightning-generated whistlers, and VLF transmitter signals. Since this leads to monotonic PADs, energy diffusion by magnetosonic waves has been proposed to account for the observations. We show that the observed PADs arise readily from two-dimensional diffusion at L = 2, with or without magnetosonic waves. It is necessary to include cross diffusion, which accounts for the relationship between pitch angle and energy changes. The distribution of flux with energy is also in good agreement with observations between 200 keV and 1 MeV, dropping to very low levels at higher energy. Thus, at this location radial diffusion may be negligible at subrelativistic as well as ultrarelativistic energy. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977974426&doi=10.1002%2f2016GL067938&partnerID=40&md5=f1a8de32cdf810f65d02d7e146f5874a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10147
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM, United States
Recommended Citation:
Albert J.M.,Starks M.J.,Horne R.B.,et al. Quasi-linear simulations of inner radiation belt electron pitch angle and energy distributions[J]. Geophysical Research Letters,2016-01-01,43(6).