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
Source PublicationThe Astrophysical Journal
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
WOS IDIOP:0004-637X-859-2-aabe84
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Affiliation1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
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).
Files in This Item:
File Name/Size DocType Version Access License
2018-IR-115.pdf(2717KB)期刊论文作者接受稿限制开放CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Li,Ting]'s Articles
[Yang,Shuhong]'s Articles
[Zhang,Qingmin]'s Articles
Baidu academic
Similar articles in Baidu academic
[Li,Ting]'s Articles
[Yang,Shuhong]'s Articles
[Zhang,Qingmin]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Li,Ting]'s Articles
[Yang,Shuhong]'s Articles
[Zhang,Qingmin]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2018-IR-115.pdf
Format: Adobe PDF
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.