DOI: 10.1002/2017JA024879
Scopus记录号: 2-s2.0-85042063159
论文题名: An Energetic Electron Flux Dropout Due to Magnetopause Shadowing on 1 June 2013
作者: Kang S.-B. ; Fok M.-C. ; Komar C. ; Glocer A. ; Li W. ; Buzulukova N.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1178
结束页码: 1190
语种: 英语
英文关键词: CIMI model
; drift loss
; dropout
; magnetopause shadowing
; pitch angle distribution (PAD)
; RBSP
英文摘要: We examine the mechanisms responsible for the dropout of energetic electron flux during 31 May to 1 June 2013 using Van Allen Probe (Radiation Belt Storm Probes (RBSP)) electron flux data and simulations with the Comprehensive Inner Magnetosphere-Ionosphere (CIMI) model. During the storm main phase, L-shells at RBSP locations are greater than ~8, which are connected to open drift shells. Consequently, diminished electron fluxes were observed over a wide range of energies. The combination of drift shell splitting, magnetopause shadowing, and drift loss all results in butterfly electron pitch angle distributions (PADs) at the nightside. During storm sudden commencement, RBSP observations display electron butterfly PADs over a wide range of energies. However, it is difficult to determine whether there are butterfly PADs during the storm main phase since the maximum observable equatorial pitch angle from RBSP is not larger than ~40° during this period. To investigate the causes of the dropout, the CIMI model is used as a global 4-D kinetic inner magnetosphere model. The CIMI model reproduces the dropout with very similar timing and flux levels and PADs along the RBSP trajectory for 593 keV. Furthermore, the CIMI simulation shows butterfly PADs for 593 keV during the storm main phase. Based on comparison of observations and simulations, we suggest that the dropout during this event mainly results from magnetopause shadowing. ©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/114624
Appears in Collections: 气候减缓与适应
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作者单位: Geospace Physics Laboratory, NASA/GSFC, Greenbelt, MD, United States; The Catholic University of America, Washington, DC, United States; Center for Space Physics, Boston University, Boston, MA, United States; University of Maryland, College Park, MD, United States
Recommended Citation:
Kang S.-B.,Fok M.-C.,Komar C.,et al. An Energetic Electron Flux Dropout Due to Magnetopause Shadowing on 1 June 2013[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)