Observing Formation of Flux Rope by Tether-cutting Reconnection in the Sun
Xue,Zhike1,2,3; Yan,Xiaoli1,2,3; Yang,Liheng1,3; Wang,Jincheng1,3,4; Zhao,Li1,3
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract 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.
KeywordSun: activity Sun: chromosphere Sun: corona Sun: magnetic fields
WOS IDIOP:2041-8205-840-2-aa7066
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming Yunnan 650216, China;
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
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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).
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