DOI: 10.1002/2013GL059024
论文题名: Effect of EMIC waves on relativistic and ultrarelativistic electron populations: Ground-based and Van Allen Probes observations
作者: Usanova M.E. ; Drozdov A. ; Orlova K. ; Mann I.R. ; Shprits Y. ; Robertson M.T. ; Turner D.L. ; Milling D.K. ; Kale A. ; Baker D.N. ; Thaller S.A. ; Reeves G.D. ; Spence H.E. ; Kletzing C. ; Wygant J.
刊名: Geophysical Research Letters
ISSN: 0094-10275
EISSN: 1944-10006
出版年: 2014
卷: 41, 期: 5 起始页码: 1375
结束页码: 1381
语种: 英语
英文关键词: EMIC waves
; loss
; pitch-angle diffusion
; relativistic electrons
; ultra-relativistic electrons
; Van Allen Probes
Scopus关键词: Geomagnetism
; Losses
; Probes
; Radiation belts
; Diffusion rate
; Electron population
; Geomagnetic storm
; Ion cyclotrons
; Magnetic activity
; Pitch-angle scattering
; Radiation belt electrons
; Relativistic electron
; Electrons
; atmospheric electricity
; electromagnetic wave
; electron
; geomagnetic storm
; ground-based measurement
; magnetosphere
; observational method
; probe
; wave action
; wave modeling
; wave scattering
英文摘要: We study the effect of electromagnetic ion cyclotron (EMIC) waves on the loss and pitch angle scattering of relativistic and ultrarelativistic electrons during the recovery phase of a moderate geomagnetic storm on 11 October 2012. The EMIC wave activity was observed in situ on the Van Allen Probes and conjugately on the ground across the Canadian Array for Real-time Investigations of Magnetic Activity throughout an extended 18 h interval. However, neither enhanced precipitation of >0.7 MeV electrons nor reductions in Van Allen Probe 90° pitch angle ultrarelativistic electron flux were observed. Computed radiation belt electron pitch angle diffusion rates demonstrate that rapid pitch angle diffusion is confined to low pitch angles and cannot reach 90°. For the first time, from both observational and modeling perspectives, we show evidence of EMIC waves triggering ultrarelativistic (~2-8 MeV) electron loss but which is confined to pitch angles below around 45° and not affecting the core distribution. Key Points EMIC wave activity is not associated with precipitation of MeV electrons EMIC waves do not deplete the ultra-relativistic belt down to 90° EMIC waves cause loss of low pitch angle electrons with energies ~2-8 MeV ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895120046&doi=10.1002%2f2013GL059024&partnerID=40&md5=99072bec0c686ffab7f5398bcdc6bb21
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7539
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Alberta, Edmonton AB, Canada
Recommended Citation:
Usanova M.E.,Drozdov A.,Orlova K.,et al. Effect of EMIC waves on relativistic and ultrarelativistic electron populations: Ground-based and Van Allen Probes observations[J]. Geophysical Research Letters,2014-01-01,41(5).