Dynamics of Threads Wrapping a Filament's Leg Prior to the Eruption on 2021 October 28

doi:10.3847/1538-4357/acf19e

	Dynamics of Threads Wrapping a Filament's Leg Prior to the Eruption on 2021 October 28
	Fang,Yue 2; Zhang,Jun 2; Bi,Yi 1; Song,Zhiping 2
刊名	The Astrophysical Journal
	2023-09-21
卷号	955 期号:2
ISSN号	0004-637X
DOI	10.3847/1538-4357/acf19e
通讯作者	Zhang,Jun()
英文摘要	Abstract Although the magnetic field structures of solar filaments have been studied for several decades, the detailed evolution of the structure around a filament prior to its eruption is rarely observed. On 2021 October 28 in AR 12887, a major solar flare (X1.0 class) occurred at 15:35 UT. Based on the Solar Dynamics Observatory high-spatial-resolution observations, we find this flare is associated with the eruption of two filaments, namely F1 and F2. The two filaments are initially independent. The western leg (WLEG) of F1 approaches the northern leg of F2, due to the continuous movement and rotation of the magnetic field in which the WLEG roots in. We find first that there are some threads wrapping the WLEG. Brightening and bidirectionally plasmoid flows that originate from a brightening are detected in these threads, then the threads disappear, and the two filaments connect. NLFFF extrapolation reveals that there is a toroidal magnetic structure enveloping the WLEG and corresponding spatially to the threads. It is expected that a filament is enveloped by toroidal magnetic fields. According to the observations and extrapolation, we suggest that these threads represent the toroidal magnetic fields wrapping the WLEG. This paper provides new details about the dynamics of the toroidal magnetic fields. Magnetic reconnection takes place in the toroidal fields and thus destroys the fields, then F1 and F2 connect, and subsequently, the two filaments erupt and the flare occurs.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:APJ_955_2_87
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/26340]
专题	云南天文台_抚仙湖太阳观测站
通讯作者	Zhang,Jun
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650216, People’s Republic of China 2.School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, People’s Republic of China; zjun@ahu.edu.cn
推荐引用方式 GB/T 7714	Fang,Yue,Zhang,Jun,Bi,Yi,et al. Dynamics of Threads Wrapping a Filament's Leg Prior to the Eruption on 2021 October 28[J]. The Astrophysical Journal,2023,955(2).
APA	Fang,Yue,Zhang,Jun,Bi,Yi,&Song,Zhiping.(2023).Dynamics of Threads Wrapping a Filament's Leg Prior to the Eruption on 2021 October 28.The Astrophysical Journal,955(2).
MLA	Fang,Yue,et al."Dynamics of Threads Wrapping a Filament's Leg Prior to the Eruption on 2021 October 28".The Astrophysical Journal 955.2(2023).