DOI: 10.1002/2016GL069029
论文题名: The influences of solar wind pressure and interplanetary magnetic field on global magnetic field and outer radiation belt electrons
作者: Yu J. ; Li L.Y. ; Cao J.B. ; Reeves G.D. ; Baker D.N. ; Spence H.
刊名: Geophysical Research Letters
ISSN: 0094-8877
EISSN: 1944-8608
出版年: 2016
卷: 43, 期: 14 起始页码: 7319
结束页码: 7327
语种: 英语
英文关键词: butterfly distributions
; day-night asymmetrical variations of magnetic field
; day-night asymmetrical variations of relativistic electron pitch angle distributions
; pancake distributions
; solar wind dynamic pressure
; southward interplanetary magnetic field
Scopus关键词: Electron energy levels
; Electrons
; Magnetic fields
; Magnetism
; Radiation belts
; Radiation effects
; Solar wind
; Structural dynamics
; Wind effects
; Butterfly distributions
; Interplanetary magnetic fields
; Pancake distributions
; Relativistic electron
; Solar wind dynamic pressure
; Magnetic field effects
; atmospheric modeling
; atmospheric motion
; diurnal variation
; electromagnetic radiation
; electron probe analysis
; magnetic field
; solar wind
英文摘要: Using the Van Allen Probe in situ measured magnetic field and electron data, we examine the solar wind dynamic pressure and interplanetary magnetic field (IMF) effects on global magnetic field and outer radiation belt relativistic electrons (≥1.8 MeV). The dynamic pressure enhancements (>2 nPa) cause the dayside magnetic field increase and the nightside magnetic field reduction, whereas the large southward IMFs (Bz-IMF < −2nT) mainly lead to the decrease of the nightside magnetic field. In the dayside increased magnetic field region (magnetic local time (MLT) ~ 06:00–18:00, and L > 4), the pitch angles of relativistic electrons are mainly pancake distributions with a flux peak around 90° (corresponding anisotropic index A > 0.1), and the higher-energy electrons have stronger pancake distributions (the larger A), suggesting that the compression-induced betatron accelerations enhance the dayside pancake distributions. However, in the nighttime decreased magnetic field region (MLT ~ 18:00–06:00, and L ≥ 5), the pitch angles of relativistic electrons become butterfly distributions with two flux peaks around 45° and 135° (A < 0). The spatial range of the nighttime butterfly distributions is almost independent of the relativistic electron energy, but it depends on the magnetic field day-night asymmetry and the interplanetary conditions. The dynamic pressure enhancements can make the nighttime butterfly distribution extend inward. The large southward IMFs can also lead to the azimuthal expansion of the nighttime butterfly distributions. These variations are consistent with the drift shell splitting and/or magnetopause shadowing effect. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978943161&doi=10.1002%2f2016GL069029&partnerID=40&md5=b1f97da83431451258def6720647975f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9840
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: School of Space and Environment, Beihang University, Beijing, China
Recommended Citation:
Yu J.,Li L.Y.,Cao J.B.,et al. The influences of solar wind pressure and interplanetary magnetic field on global magnetic field and outer radiation belt electrons[J]. Geophysical Research Letters,2016-01-01,43(14).