globalchange  > 气候减缓与适应
DOI: 10.1002/2013GL058713
论文题名:
An empirically observed pitch-angle diffusion eigenmode in the Earth's electron belt near L* = 5.0
作者: O'Brien T.P.; Claudepierre S.G.; Blake J.B.; Fennell J.F.; Clemmons J.H.; Roeder J.L.; Spence H.E.; Reeves G.D.; Baker D.N.
刊名: Geophysical Research Letters
ISSN: 0094-10488
EISSN: 1944-10219
出版年: 2014
卷: 41, 期:2
起始页码: 251
结束页码: 258
语种: 英语
英文关键词: Diffusion ; Eigenmodes ; Radiation belt decay ; Wave-particle interactions
Scopus关键词: NASA ; Radiation belts ; Decay mechanisms ; Diffusion operators ; Dynamic process ; Eigen modes ; Electron belts ; Exponential decays ; Pitch-angle scattering ; Wave-particle interactions ; Diffusion ; atmospheric electricity ; diffusion ; eigenvalue ; electron ; empirical analysis ; plasma ; scattering
英文摘要: Using data from NASA's Van Allen Probes, we have identified a synchronized exponential decay of electron flux in the outer zone, near L* = 5.0. Exponential decays strongly indicate the presence of a pure eigenmode of a diffusion operator acting in the synchronized dimension(s). The decay has a time scale of about 4 days with no dependence on pitch angle. While flux at nearby energies and L* is also decaying exponentially, the decay time varies in those dimensions. This suggests the primary decay mechanism is elastic pitch angle scattering, which itself depends on energy and L *. We invert the shape of the observed eigenmode to obtain an approximate shape of the pitch angle diffusion coefficient and show excellent agreement with diffusion by plasmaspheric hiss. Our results suggest that empirically derived eigenmodes provide a powerful diagnostic of the dynamic processes behind exponential decays. ©2014. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892970721&doi=10.1002%2f2013GL058713&partnerID=40&md5=635b5ebfe43dcae4e0aea3c91a0e3b44
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7752
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作者单位: Space Sciences Department, Aerospace Corporation, Los Angeles, CA, United States

Recommended Citation:
O'Brien T.P.,Claudepierre S.G.,Blake J.B.,et al. An empirically observed pitch-angle diffusion eigenmode in the Earth's electron belt near L* = 5.0[J]. Geophysical Research Letters,2014-01-01,41(2).
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