Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun

doi:10.3847/2041-8213/aa7066

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	Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun
	Xue,Zhike 1,2,3; Yan,Xiaoli 1,2,3; Yang,Liheng 1,3; Wang,Jincheng 1,3,4; Zhao,Li 1,3
刊名	The Astrophysical Journal Letters
	2017-05-11
卷号	840 期号:2
关键词	Sun: activity Sun: chromosphere Sun: corona Sun: magnetic fields
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa7066
英文摘要	Abstract Tether-cutting reconnection is considered as one mechanism for the formation of a flux rope. It has been proposed for more than 30 years; however, so far, direct observations of it are very rare. In this Letter, we present observations of the formation of a flux rope via tether-cutting reconnection in NOAA AR 11967 on 2014 February 2 by combining observations with the New Vacuum Solar Telescope and the Solar Dynamic Observatory. The tether-cutting reconnection occurs between two sets of highly sheared magnetic arcades. Comprehensive observational evidence of the reconnection is as follows: changes of the connections between the arcades, brightenings at the reconnection site, hot outflows, formation of a flux rope, slow-rise motion of the flux rope, and flux cancelation. The outflows are along three directions from the reconnection site to the footpoints with the velocities from 24?±?1 km s?1 to 69?±?5 km s?1. Additionally, it is found that the newly formed flux rope connects far footpoints and has a left-handed twisted structure with many fine threads and a concave-up-shape structure in the middle. All the observations are in agreement with the tether-cutting model and provide evidence that tether-cutting reconnection leads to the formation of the flux rope associated with flux shear flow and cancelation.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:2041-8205-840-2-AA7066
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/36019]
专题	中国科学院国家天文台
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, Kunming Yunnan 650216, China; zkxue@ynao.ac.cn 2.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, China 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, China 4.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Xue,Zhike,Yan,Xiaoli,Yang,Liheng,et al. Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun[J]. The Astrophysical Journal Letters,2017,840(2).
APA	Xue,Zhike,Yan,Xiaoli,Yang,Liheng,Wang,Jincheng,&Zhao,Li.(2017).Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun.The Astrophysical Journal Letters,840(2).
MLA	Xue,Zhike,et al."Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun".The Astrophysical Journal Letters 840.2(2017).