DOI: 10.1002/2015GL063542
论文题名: Unraveling the drivers of the storm time radiation belt response
作者: Kilpua E.K.J. ; Hietala H. ; Turner D.L. ; Koskinen H.E.J. ; Pulkkinen T.I. ; Rodriguez J.V. ; Reeves G.D. ; Claudepierre S.G. ; Spence H.E.
刊名: Geophysical Research Letters
ISSN: 0094-8701
EISSN: 1944-8432
出版年: 2015
卷: 42, 期: 9 起始页码: 3076
结束页码: 3084
语种: 英语
英文关键词: coronal mass ejections
; magnetic storms
; radiation belts
; solar wind storm drivers
; stream interaction regions
Scopus关键词: Electrons
; Geomagnetism
; Solar wind
; Storms
; Coronal mass ejection
; Geosynchronous orbits
; Interaction region
; Interface regions
; Magnetic storms
; Solar wind drivers
; Stream interfaces
; Superposed-epoch analysis
; Radiation belts
; electromagnetic radiation
; interface
; solar wind
; streamflow
; timescale
英文摘要: We present a new framework to study the time evolution and dynamics of the outer Van Allen belt electron fluxes. The framework is entirely based on the large-scale solar wind storm drivers and their substructures. The Van Allen Probe observations, revealing the electron flux behavior throughout the outer belt, are combined with continuous, long-term (over 1.5 solar cycles) geosynchronous orbit data set from GOES and solar wind measurements A superposed epoch analysis, where we normalize the timescales for each substructure (sheath, ejecta, and interface region) allows us to avoid smearing effects and to distinguish the electron flux evolution during various driver structures. We show that the radiation belt response is not random: The electron flux variations are determined by the combined effect of the structured solar wind driver and prestorm electron flux levels. In particular, we find that loss mechanisms dominate during stream interface regions, coronal mass ejection (CME) ejecta, and sheaths while enhancements occur during fast streams trailing the stream interface or the CME. Key Points We superpose the different substructures of each solar wind storm driver During stream interface regions, CME ejecta and sheaths loss mechanisms dominate Enhancements occur during fast streams trailing the stream interface or the CME ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930480593&doi=10.1002%2f2015GL063542&partnerID=40&md5=04790e56a0e630209689a7f4d951a751
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8317
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: Department of Physics, University of Helsinki, Helsinki, Finland
Recommended Citation:
Kilpua E.K.J.,Hietala H.,Turner D.L.,et al. Unraveling the drivers of the storm time radiation belt response[J]. Geophysical Research Letters,2015-01-01,42(9).