DOI: 10.1002/2016GL069350
论文题名: Occurrence characteristics of outer zone relativistic electron butterfly distribution: A survey of Van Allen Probes REPT measurements
作者: Ni B. ; Zou Z. ; Li X. ; Bortnik J. ; Xie L. ; Gu X.
刊名: Geophysical Research Letters
ISSN: 0094-8995
EISSN: 1944-8726
出版年: 2016
卷: 43, 期: 11 起始页码: 5644
结束页码: 5652
语种: 英语
英文关键词: butterfly pitch angle distributions
; global occurrence pattern
; outer radiation belt
; relativistic electrons
Scopus关键词: Dynamics
; Electron energy levels
; Geomagnetism
; Magnetosphere
; Probes
; Radiation belts
; Solar wind
; Geomagnetic activities
; Magnetic local time
; Occurrence pattern
; Outer radiation belt
; Physical mechanism
; Pitch angle distribution
; Relativistic electron
; Solar wind dynamic pressure
; Electrons
英文摘要: Using Van Allen Probes Relativistic Electron Proton Telescope (REPT) pitch angle resolved electron flux data from September 2012 to March 2015, we investigate in detail the global occurrence pattern of equatorial (|λ| ≤ 3°) butterfly distribution of outer zone relativistic electrons and its potential correlation with the solar wind dynamic pressure. The statistical results demonstrate that these butterfly distributions occur with the highest occurrence rate ~ 80% at ~ 20–04 magnetic local time (MLT) and L > ~ 5.5 and with the second peak (> ~ 50%) at ~ 11–15 MLT of lower L shells ~ 4.0. They can also extend to L = 3.5 and to other MLT intervals but with the occurrence rates predominantly < ~25%. It is further shown that outer zone relativistic electron butterfly distributions are likely to peak between 58° and 79° for L = 4.0 and 5.0 and between 37° and 58° for L = 6.0, regardless of the level of solar wind dynamic pressure. Relativistic electron butterfly distributions at L = 4.0 also exhibit a pronounced day-night asymmetry in response to the Pdyn variations. Compared to the significant L shell and MLT dependence of the global occurrence pattern, outer zone relativistic electron butterfly distributions show much less but still discernable sensitivity to Pdyn, geomagnetic activity level, and electron energy, the full understanding of which requires future attempts of detailed simulations that combine and differentiate underlying physical mechanisms of the geomagnetic field asymmetry and scattering by various magnetospheric waves. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977459166&doi=10.1002%2f2016GL069350&partnerID=40&md5=4b197cc26988aca5e26b60dccc3174fd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9958
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 Space Physics, School of Electronic Information, Wuhan University, Wuhan, China
Recommended Citation:
Ni B.,Zou Z.,Li X.,et al. Occurrence characteristics of outer zone relativistic electron butterfly distribution: A survey of Van Allen Probes REPT measurements[J]. Geophysical Research Letters,2016-01-01,43(11).