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Two Episodes of Magnetic Reconnections during a Confined Circular-ribbon Flare
Li,Ting1,2; Yang,Shuhong1,2; Zhang,Qingmin3; Hou,Yijun1,2; Zhang,Jun1,2
2018-05-30
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume859Issue:2
AbstractAbstract We analyze a unique event with an M1.8 confined circular-ribbon flare on 2016 February 13, with successive formations of two circular ribbons at the same location. The flare had two distinct phases of UV and extreme ultraviolet emissions with an interval of about 270 s, of which the second peak was energetically more important. The first episode was accompanied by the eruption of a mini-filament and the fast elongation motion of a thin circular ribbon (CR1) along the counterclockwise direction at a speed of about 220 km s?1. Two elongated spine-related ribbons were also observed, with the inner ribbon co-temporal with CR1 and the remote brightenings forming ~20 s later. In the second episode, another mini-filament erupted and formed a blowout jet. The second circular ribbon and two spine-related ribbons showed similar elongation motions with that during the first episode. The extrapolated three-dimensional coronal magnetic fields reveal the existence of a fan-spine topology, together with a quasi-separatrix layer (QSL) halo surrounding the fan plane and another QSL structure outlining the inner spine. We suggest that continuous null-point reconnection between the filament and ambient open field occurs in each episode, leading to the sequential opening of the filament and significant shifts of the fan plane footprint. For the first time, we propose a compound eruption model of circular-ribbon flares consisting of two sets of successively formed ribbons and eruptions of multiple filaments in a fan-spine-type magnetic configuration.
Keywordmagnetic reconnection Sun: activity Sun: flares Sun: magnetic fields
DOI10.3847/1538-4357/aabe84
Language英语
WOS IDIOP:0004-637X-859-2-aabe84
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23479
Collection中国科学院紫金山天文台
Affiliation1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China liting@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 for Dark Matter and Space Science, Purple Mountain Observatory, CAS, Nanjing 210034, People's Republic of China
Recommended Citation
GB/T 7714
Li,Ting,Yang,Shuhong,Zhang,Qingmin,et al. Two Episodes of Magnetic Reconnections during a Confined Circular-ribbon Flare[J]. The Astrophysical Journal,2018,859(2).
APA Li,Ting,Yang,Shuhong,Zhang,Qingmin,Hou,Yijun,&Zhang,Jun.(2018).Two Episodes of Magnetic Reconnections during a Confined Circular-ribbon Flare.The Astrophysical Journal,859(2).
MLA Li,Ting,et al."Two Episodes of Magnetic Reconnections during a Confined Circular-ribbon Flare".The Astrophysical Journal 859.2(2018).
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