DOI: 10.1002/2015GL064369
论文题名: On the generation of magnetic dips ahead of advancing dipolarization fronts
作者: Pan D.-X. ; Zhou X.-Z. ; Shi Q.-Q. ; Liu J. ; Angelopoulos V. ; Runov A. ; Zong Q.-G. ; Fu S.-Y.
刊名: Geophysical Research Letters
ISSN: 0094-9356
EISSN: 1944-9087
出版年: 2015
卷: 42, 期: 11 起始页码: 4256
结束页码: 4262
语种: 英语
英文关键词: Bz dip
; diamagnetic currents
; dipolarization front
; ion reflection
; THEMIS statistics
Scopus关键词: Ions
; Magnetic flux
; Magnetism
; Magnetosphere
; Plasma density
; Plasma sheaths
; Radiation belts
; Ambient plasmas
; Diamagnetic currents
; Dipolarization
; Magnetic perturbation
; Plasma sheet
; Propagation speed
; Secondary currents
; Statistical signatures
; Magnetoplasma
英文摘要: Dipolarizing flux bundles transport magnetic flux to the inner and dayside magnetosphere, heat the plasma sheet, and provide a seed population to the radiation belt. The magnetic perturbation ahead of them, often referred to as a dipolarization front (DF), is asymmetric with a small Bz dip followed by a sharp Bz enhancement. The Bz dip is thought to be generated from dawnward currents carried by DF-reflected ions; after reflection, these earthward moving ions gyrate clockwise and contribute to dawnward diamagnetic currents ahead of the front. Using observations of hundreds of DFs, we investigate this hypothesis. We find that the depth of the Bz dip as a function of the front azimuth depends on DF propagation speed and ambient plasma density. These statistical signatures support the hypothesis that the Bz dip is caused by ion reflection and suggest that secondary currents carried by these reflected ions can reshape the front significantly. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934436599&doi=10.1002%2f2015GL064369&partnerID=40&md5=98cb7c0f0f6905760817630bdfd8ebda
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8971
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 Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Pan D.-X.,Zhou X.-Z.,Shi Q.-Q.,et al. On the generation of magnetic dips ahead of advancing dipolarization fronts[J]. Geophysical Research Letters,2015-01-01,42(11).