Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare

doi:10.3847/1538-4357/ab1f67

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	Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare
	Yang,Shuhong 1,2; Zhang,Jun 1,2; Song,Qiao 3; Bi,Yi 4; Li,Ting 1,2
刊名	The Astrophysical Journal
	2019-06-12
卷号	878 期号:1
关键词	magnetic reconnection Sun: activity Sun: flares Sun: magnetic fields
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1f67
英文摘要	Abstract Combining the Solar Dynamics Observatory and the New Vacuum Solar Telescope observations, we study a confined flare triggered by a rising flux rope within the trailing sunspots of active region 12733. The flux rope lying above the sheared polarity inversion line can be constructed through magnetic extrapolation but could not be detected in multiwavelength images at the pre-flare stage. The conspicuous shearing motions between the opposite-polarity fields in the photosphere are considered to be responsible for the flux rope formation. The maximum twist of the flux rope is as high as ?1.76, and then the flux rope rises due to the kink instability. Only when the flare starts can the flux rope be observed in high-temperature wavelengths. The differential emission measure results confirm that this flux rope is a high-temperature structure. Associated with the rising flux rope, there appear many post-flare loops and a pair of flare ribbons. When the rising flux rope meets and reconnects with the large-scale overlying field lines, a set of large-scale twisted loops are formed, and two flare ribbons propagating in opposite directions appear on the outskirts of the former ribbons, indicating that the twist of the flux rope is transferred to a much larger system. These results imply that the external reconnection between the rising flux rope and the large-scale overlying loops plays an important role in the confined flare formation.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-878-1-AB1F67
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26586]
专题	中国科学院国家天文台
作者单位	1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China shuhongyang@nao.cas.cn 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, People’s Republic of China 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China
推荐引用方式 GB/T 7714	Yang,Shuhong,Zhang,Jun,Song,Qiao,et al. Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare[J]. The Astrophysical Journal,2019,878(1).
APA	Yang,Shuhong,Zhang,Jun,Song,Qiao,Bi,Yi,&Li,Ting.(2019).Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare.The Astrophysical Journal,878(1).
MLA	Yang,Shuhong,et al."Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare".The Astrophysical Journal 878.1(2019).