On the generation of magnetic dips ahead of advancing dipolarization   fronts

doi:10.1002/2015GL064369

CORC > 北京大学 > 地球与空间科学学院

	On the generation of magnetic dips ahead of advancing dipolarization fronts
	Pan, Dong-Xiao ; Zhou, Xu-Zhi ; Shi, Quan-Qi ; Liu, Jiang ; Angelopoulos, Vassilis ; Runov, Andrei ; Zong, Qiu-Gang ; Fu, Sui-Yan
刊名	GEOPHYSICAL RESEARCH LETTERS
	2015
关键词	dipolarization front B-z dip ion reflection diamagnetic currents THEMIS statistics PLASMA SHEET ION REFLECTION FLOW BURSTS FLUX TUBES RECONNECTION CLUSTER PERTURBATIONS SIMULATIONS TRANSPORT PRESSURE
DOI	10.1002/2015GL064369
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 B-z dip followed by a sharp B-z enhancement. The B-z 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 B-z 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 B-z dip is caused by ion reflection and suggest that secondary currents carried by these reflected ions can reshape the front significantly.; NSFC [41474140, 41421003]; NASA [NAS5-02099]; SCI(E); EI; ARTICLE; xuzhi.zhou@gmail.com; 11; 4256-4262; 42
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/419294]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Pan, Dong-Xiao,Zhou, Xu-Zhi,Shi, Quan-Qi,et al. On the generation of magnetic dips ahead of advancing dipolarization fronts[J]. GEOPHYSICAL RESEARCH LETTERS,2015.
APA	Pan, Dong-Xiao.,Zhou, Xu-Zhi.,Shi, Quan-Qi.,Liu, Jiang.,Angelopoulos, Vassilis.,...&Fu, Sui-Yan.(2015).On the generation of magnetic dips ahead of advancing dipolarization fronts.GEOPHYSICAL RESEARCH LETTERS.
MLA	Pan, Dong-Xiao,et al."On the generation of magnetic dips ahead of advancing dipolarization fronts".GEOPHYSICAL RESEARCH LETTERS (2015).