Review on Current Sheets in CME Development: Theories and Observations

	Review on Current Sheets in CME Development: Theories and Observations
	Lin J(林隽)1 ; Murphy, NA 2; Shen, CC 2; Raymond, JC 2; Reeves, KK 2; Zhong, JY 3; Wu, N 4; Li Y(李燕)1 ; Shen, Chengcai
刊名	SPACE SCIENCE REVIEWS
	2015-11
卷号	194 期号:1-4 页码:237-302
关键词	Sun: flares Sun: coronal mass ejections (CMEs) Plasmas Magnetic reconnection Instabilities
ISSN号	0038-6308
通讯作者	Lin, J (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Yunnan, Peoples R China.
产权排序	第一完成单位
英文摘要	We introduce how the catastrophe model for solar eruptions predicted the formation and development of the long current sheet (CS) and how the observations were used to recognize the CS at the place where the CS is presumably located. Then, we discuss the direct measurement of the CS region thickness by studying the brightness distribution of the CS region at different wavelengths. The thickness ranges from to about at heights between 0.27 and from the solar surface. But the traditional theory indicates that the CS is as thin as the proton Larmor radius, which is of order tens of meters in the corona. We look into the huge difference in the thickness between observations and theoretical expectations. The possible impacts that affect measurements and results are studied, and physical causes leading to a thick CS region in which reconnection can still occur at a reasonably fast rate are analyzed. Studies in both theories and observations suggest that the difference between the true value and the apparent value of the CS thickness is not significant as long as the CS could be recognised in observations. We review observations that show complex structures and flows inside the CS region and present recent numerical modelling results on some aspects of these structures. Both observations and numerical experiments indicate that the downward reconnection outflows are usually slower than the upward ones in the same eruptive event. Numerical simulations show that the complex structure inside CS and its temporal behavior as a result of turbulence and the Petschek-type slow-mode shock could probably account for the thick CS and fast reconnection. But whether the CS itself is that thick still remains unknown since, for the time being, we cannot measure the electric current directly in that region. We also review the most recent laboratory experiments of reconnection driven by energetic laser beams, and discuss some important topics for future works.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	CORONAL MASS EJECTION ; SUPRA-ARCADE DOWNFLOWS ; RECONNECTING CURRENT SHEETS ; CURRENT-LAYER FRAGMENTATION ; FAST MAGNETIC RECONNECTION ; FIELD LINE SHRINKAGE ; FLUX-ROPE MODELS ; HOT FLARE PLASMA ; X-RAY TELESCOPE ; 2010 NOVEMBER 3
收录类别	SCI ; EI
原文出处	http://link.springer.com/article/10.1007%2Fs11214-015-0209-0
语种	英语
WOS记录号	WOS:000365511500004
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6261]
专题	云南天文台_太阳物理研究组
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan, 650216, China 2.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, 02138, USA 3.Key Laboratory of Optical Astronomy, National Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China 4.School of Tourism and Geography, Yunnan Normal University, 293 Street 121, Kunming, Yunnan, 650092, China
推荐引用方式 GB/T 7714	Lin J,Murphy, NA,Shen, CC,et al. Review on Current Sheets in CME Development: Theories and Observations[J]. SPACE SCIENCE REVIEWS,2015,194(1-4):237-302.
APA	Lin J.,Murphy, NA.,Shen, CC.,Raymond, JC.,Reeves, KK.,...&Shen, Chengcai.(2015).Review on Current Sheets in CME Development: Theories and Observations.SPACE SCIENCE REVIEWS,194(1-4),237-302.
MLA	Lin J,et al."Review on Current Sheets in CME Development: Theories and Observations".SPACE SCIENCE REVIEWS 194.1-4(2015):237-302.