The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection

doi:10.3847/1538-4357/ab1083

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	The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection
	Zhong,Sihui 1,2; Hou,Yijun 1,2; Zhang,Jun 1,2
刊名	The Astrophysical Journal
	2019-05-01
卷号	876 期号:1
关键词	magnetic reconnection Sun: activity Sun: atmosphere Sun: chromosphere Sun: evolution Sun: magnetic fields
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1083
英文摘要	Abstract The emergence of active regions (ARs) leads to various dynamic activities. Using high-resolution and long-lasting Hα observations from the New Vacuum Solar Telescope, we report the dynamics of NOAA AR 12700 in its emerging phase on 2018 February 26 in detail. In this AR, constant interchange reconnections (IRs) between emerging fibrils and preexisting ones were detected. Driven by the flux emergence, small-scale fibrils observed in Hα wavelength continuously emerged at the center of the AR and reconnected with the ambient preexisting fibrils, forming new longer fibrils. We investigate three IR scenarios that occurred over two hours. Specially, the third scenario of reconnection resulted in the formation of longer fibrils that show pronounced rotation motion. To derive the evolution of the magnetic structure during the reconnections, we perform nonlinear force-free field extrapolations. The extrapolated three-dimensional magnetic fields clearly depict a set of almost potential emerging loops, two preexisting flux ropes at 03:00 UT before the second reconnection scenario, and a set of newly formed loops with less twist at 03:48 UT after the third reconnection scenario. All of these extrapolated structures are consistent with the fibrils detected at the Hα wavelength. The aforementioned observations and extrapolation results suggest that the constant IRs resulted in the magnetic twist being redistributed from preexisting flux ropes toward the newly formed system with longer magnetic structure and weaker twist.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-876-1-AB1083
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26202]
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 zsh@nao.cas.cn, zjun@nao.cas.cn 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
推荐引用方式 GB/T 7714	Zhong,Sihui,Hou,Yijun,Zhang,Jun. The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection[J]. The Astrophysical Journal,2019,876(1).
APA	Zhong,Sihui,Hou,Yijun,&Zhang,Jun.(2019).The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection.The Astrophysical Journal,876(1).
MLA	Zhong,Sihui,et al."The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection".The Astrophysical Journal 876.1(2019).