A Secondary Fan-spine Magnetic Structure in Active Region 11897

doi:10.3847/1538-4357/aaf4f4

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	A Secondary Fan-spine Magnetic Structure in Active Region 11897
	Hou,Yijun 1,2; Li,Ting 1,2; Yang,Shuhong 1,2; Zhang,Jun 1,2
刊名	The Astrophysical Journal
	2019-01-17
卷号	871 期号:1
关键词	magnetic reconnection Sun: activity Sun: evolution Sun: filaments, prominences Sun: flares Sun: magnetic fields
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaf4f4
英文摘要	Abstract Fan-spine is a special topology in solar atmosphere and is closely related to magnetic null point, as well as circular-ribbon flares, which can provide important information for understanding the intrinsic 3D nature of solar flares. However, the fine structure within the fan has rarely been investigated. In present paper, we investigate a secondary fan-spine (SFS) structure within the fan of a larger fan-spine topology. On 2013 November 18, this large fan-spine structure was traced out owing to the partial eruption of a filament, which caused a circular-ribbon flare in NOAA Active Region 11897. The extrapolated 3D magnetic fields and squashing factor Q maps depict distinctly this fan-spine topology, its surrounding quasi-separatrix layer (QSL) halo, and a smaller quasi-circular ribbon with high Q located in the center, which implies the existence of fine structure within the fan. The imaging observations, extrapolated 3D fields, and Q maps on November 17 show that there indeed exists an SFS surrounded by a QSL, which is enveloped by another QSL halo corresponding to the overlying larger dome-shaped fan. Moreover, the material flows caused by the null-point reconnection are also detected along this SFS. After checking the evolution of the underneath magnetic fields, we suggest that the continuous emergence of magnetic flux within the central parasitic region encompassed by the opposite-polarity fields results in the formation of the SFS under the large fan.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-871-1-AAF4F4
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/24697]
专题	中国科学院国家天文台
作者单位	1.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 2.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of Chinayijunhou@nao.cas.cn, zjun@nao.cas.cn
推荐引用方式 GB/T 7714	Hou,Yijun,Li,Ting,Yang,Shuhong,et al. A Secondary Fan-spine Magnetic Structure in Active Region 11897[J]. The Astrophysical Journal,2019,871(1).
APA	Hou,Yijun,Li,Ting,Yang,Shuhong,&Zhang,Jun.(2019).A Secondary Fan-spine Magnetic Structure in Active Region 11897.The Astrophysical Journal,871(1).
MLA	Hou,Yijun,et al."A Secondary Fan-spine Magnetic Structure in Active Region 11897".The Astrophysical Journal 871.1(2019).