DOI: 10.1002/2013GL058712
论文题名: Breaking all the invariants: Anomalous electron radiation belt diffusion by pitch angle scattering in the presence of split magnetic drift shells
作者: O'Brien T.P.
刊名: Geophysical Research Letters
ISSN: 0094-10480
EISSN: 1944-10211
出版年: 2014
卷: 41, 期: 2 起始页码: 216
结束页码: 222
语种: 英语
英文关键词: Diffusion
; Drift shell splitting
; Radiation belt
Scopus关键词: Geomagnetism
; Plasma theory
; Radiation belts
; Shells (structures)
; Drift shell
; Electron radiation belt
; Geo-stationary orbits
; Magnetic field topology
; Pitch angle distribution
; Pitch-angle scattering
; Relativistic electron
; Wave-particle interactions
; Diffusion
; diffusion
; magnetic field
; radial flow
; simulation
; wave modeling
英文摘要: Relativistic electron observations near geostationary orbit routinely show pitch angle distributions peaked away from 90 degrees. These "butterfly" distributions are consistent with magnetic drift shell splitting combined with a radial flux gradient. During magnetic storms, nature adds pitch angle scattering to split drift shells, breaking all three adiabatic invariants of the particle's motion. Therefore, some degree of anomalous radial diffusion is likely, and cross terms between the gyration and drift invariants and between the bounce and drift invariants arise. Using typical assumptions about the pitch angle scattering and the magnetic field topology, we calculate these anomalous diffusion coefficients near geostationary orbit. We show that the anomalous radial diffusion can exceed that due to more traditional drift-resonant wave-particle interactions. We also show that the neglected cross terms, particularly the bounce-drift cross term, can be significant. These results suggest necessary additions to some global electron radiation belt simulations. ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892667024&doi=10.1002%2f2013GL058712&partnerID=40&md5=1a187a71e26f39916b8f12d4e025223f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7744
Appears in Collections: 气候减缓与适应
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作者单位: Space Sciences Department, Aerospace Corporation, El Segundo, CA, United States
Recommended Citation:
O'Brien T.P.. Breaking all the invariants: Anomalous electron radiation belt diffusion by pitch angle scattering in the presence of split magnetic drift shells[J]. Geophysical Research Letters,2014-01-01,41(2).