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High-resolution Observations of Flares in an Arch Filament System
Su,Yingna1,2; Liu,Rui3,4; Li,Shangwei1,5; Cao,Wenda6,7; Ahn,Kwangsu6; Ji,Haisheng1,2
2018-03-09
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume855Issue:2
AbstractAbstract We study five sequential solar flares (SOL2015-08-07) occurring in Active Region 12396 observed with the Goode Solar Telescope (GST) at the Big Bear Solar Observatory, complemented by Interface Region Imaging Spectrograph and SDO observations. The main flaring region is an arch filament system (AFS) consisting of multiple bundles of dark filament threads enclosed by semicircular flare ribbons. We study the magnetic configuration and evolution of the active region by constructing coronal magnetic field models based on SDO/HMI magnetograms using two independent methods, i.e., the nonlinear force-free field (NLFFF) extrapolation and the flux rope insertion method. The models consist of multiple flux ropes with mixed signs of helicity, i.e., positive (negative) in the northern (southern) region, which is consistent with the GST observations of multiple filament bundles. The footprints of quasi-separatrix layers (QSLs) derived from the extrapolated NLFFF compare favorably with the observed flare ribbons. An interesting double-ribbon fine structure located at the east border of the AFS is consistent with the fine structure of the QSL’s footprint. Moreover, magnetic field lines traced along the semicircular footprint of a dome-like QSL surrounding the AFS are connected to the regions of significant helicity and Poynting flux injection. The maps of magnetic twist show that positive twist became dominant as time progressed, which is consistent with the injection of positive helicity before the flares. We hence conclude that these circular shaped flares are caused by 3D magnetic reconnection at the QSLs associated with the AFS possessing mixed signs of helicity.
KeywordSun: chromosphere Sun: corona Sun: evolution Sun: filaments, prominences Sun: flares Sun: magnetic fields
DOI10.3847/1538-4357/aaac31
Language英语
WOS IDIOP:0004-637X-855-2-aaac31
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22010
Collection中国科学院紫金山天文台
Affiliation1.Key Laboratory of DMSA, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China; ynsu@pmo.ac.cn
2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
3.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026, People’s Republic of China; rliu@ustc.edu.cn
4.Collaborative Innovation Center of Astronautical Science and Technology, Hefei 230026, People’s Republic of China
5.University of CAS, Beijing 100049, People’s Republic of China
6.Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, California 92314-9672, USA
7.Center for Solar-Terrestrial Research, New Jersey Institute of Technology, University Heights, Newark, New Jersey 07102-1982, USA
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GB/T 7714
Su,Yingna,Liu,Rui,Li,Shangwei,et al. High-resolution Observations of Flares in an Arch Filament System[J]. The Astrophysical Journal,2018,855(2).
APA Su,Yingna,Liu,Rui,Li,Shangwei,Cao,Wenda,Ahn,Kwangsu,&Ji,Haisheng.(2018).High-resolution Observations of Flares in an Arch Filament System.The Astrophysical Journal,855(2).
MLA Su,Yingna,et al."High-resolution Observations of Flares in an Arch Filament System".The Astrophysical Journal 855.2(2018).
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