DOI: 10.1002/2014GL059551
论文题名: Depleting effects of ICME-driven sheath regions on the outer electron radiation belt
作者: Hietala H. ; Kilpua E.K.J. ; Turner D.L. ; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-10199
EISSN: 1944-9930
出版年: 2014
卷: 41, 期: 7 起始页码: 2258
结束页码: 2265
语种: 英语
英文关键词: geomagnetic storms
; interplanetary coronal mass ejections
; radiation belts
; sheath regions
; space weather
Scopus关键词: Compaction
; Data compression
; Geomagnetism
; Magnetopause
; Planetary surface analysis
; Radiation belts
; Storms
; Electron radiation belt
; Geomagnetic storm
; Interplanetary coronal mass ejections
; Relativistic electron
; Sheath regions
; Space weather
; Superposed-epoch analysis
; Ultra low frequencies
; Electrons
; atmospheric electricity
; coronal mass ejection
; electron
; geomagnetic storm
; magnetopause
; magnetosphere
英文摘要: We study the effect of interplanetary coronal mass ejection (ICME)-driven sheath regions on relativistic outer radiation belt electron fluxes. We employ superposed epoch analysis, and, unlike previous studies, we segregate the sheath from the ejecta. We find that sheaths typically result in more than an order of magnitude decrease in the relativistic electron fluxes and that the fluxes stay below the pre-event level for more than 2 days after the sheath passage the electron depletions are stronger for sheaths that exhibit higher power in magnetic and dynamic pressure fluctuations in the ultralow frequency range and cause larger magnetospheric compressions. Depletions are even stronger for sheaths that encompass the entire storm main phase. Our findings suggest that sheaths are effective at depleting the electron fluxes because they increase radial diffusion under magnetospheric compression conditions, thereby enhancing magnetopause shadowing losses, particularly when the Dst effect can act in concert. Key Points Sheath region superposed separately from the ejecta Fluxes decrease by >1 order of magnitude and stay below pre-event level for >2 days Magnetopause shadowing, ULF-driven radial diffusion, and Dst effect act together © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899036812&doi=10.1002%2f2014GL059551&partnerID=40&md5=4f407ee7af874e37eaf4516b0eee87eb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7463
Appears in Collections: 气候减缓与适应
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作者单位: Blackett Laboratory, Imperial College London, London, United Kingdom
Recommended Citation:
Hietala H.,Kilpua E.K.J.,Turner D.L.,et al. Depleting effects of ICME-driven sheath regions on the outer electron radiation belt[J]. Geophysical Research Letters,2014-01-01,41(7).