Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase

	Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase
	Duan, Suping; Dai, Lei; Wang, Chi; Lui, A. T. Y.; Liu, Zhenxing; He, Zhaohai; Zhang, Yongcun; Dandouras, I.; Reme, H.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2015
卷号	120 期号:10 页码:8317-8326
关键词	energetic O+ ions storm flux rope magnetosheath
ISSN号	2169-9380
通讯作者	Duan, SP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing, Peoples R China.
英文摘要	We present measurements from Cluster spacecraft to investigate the energetic singly charged oxygen ions, O+, within the flux ropes in the nightside high-latitude magnetosheath during the initial phase of an intense storm on 24 October 2011. Three magnetic flux ropes were identified by Cluster 4 in the intervals from 20:10 UT to 20:20 UT. Unusually, large number density of energetic O+ ions at energy of tens of keV was detected within these flux ropes. The number density of O+ ions was above 0.1cm(-3) and the maximum value was about 0.25cm(-3), 1 order of magnitude larger than the ambient value (0.01cm(-3)) in the magnetosheath. The O+/H+ ratio is as large as 0.08 within the flux ropes. Enhanced convection electric fields E-y (10mV/m) are associated with the flux rope and the high concentrations of energetic O+. The flux ropes, which are presumably produced by magnetic reconnection at the dayside magnetopause or cusp, are convected at a larger velocity than the tailward velocity of ambient flows in the magnetosheath. These observations together show that abundant energetic O+ ions are carried by the flux ropes toward tail in the nightside magnetosheath. Our observations present new evidence for a chain linking the dayside to the nightside in the global O+ transport process.
收录类别	SCI
语种	英语
公开日期	2016-03-01
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/5269]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Duan, Suping,Dai, Lei,Wang, Chi,et al. Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(10):8317-8326.
APA	Duan, Suping.,Dai, Lei.,Wang, Chi.,Lui, A. T. Y..,Liu, Zhenxing.,...&Reme, H..(2015).Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(10),8317-8326.
MLA	Duan, Suping,et al."Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.10(2015):8317-8326.