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Reconstruction of a Large-scale Pre-flare Coronal Current Sheet Associated with a Homologous X-shaped Flare
Jiang, Chaowei1,2,3; Yan, Xiaoli4; Feng, Xueshang1,3; Duan, Aiying5; Hu, Qiang2; Zuo, Pingbing1,3; Wang, Yi1,3; Jiang, Chaowei(Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen 518055, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL
2017-11-20
卷号850期号:1
DOI10.3847/1538-4357/aa917a
产权排序第4完成单位
收录类别SCI
关键词Magnetic Fields Magnetohydrodynamics (Mhd) Methods: Numerical Sun: Corona Sun: Flares
摘要As a fundamental magnetic structure in the solar corona, electric current sheets (CSs) can form either prior to or during a solar flare, and they are essential for magnetic energy dissipation in the solar corona because they enable magnetic reconnection. However, the static reconstruction of a CS is rare, possibly due to limitations that are inherent in the available coronal field extrapolation codes. Here we present the reconstruction of a large-scale preflare CS in solar active region. 11967 using an MHD-relaxation model constrained by the SDO/HMI vector magnetogram. The CS is associated with a set of peculiar homologous flares that exhibit unique X-shaped ribbons and loops occurring in a quadrupolar magnetic configuration. This is evidenced by an 'X' shape, formed from the field lines traced from the CS to the photosphere. This nearly reproduces the shape of the observed flare ribbons, suggesting that the flare is a product of the dissipation of the CS via reconnection. The CS forms in a hyperbolic flux tube, which is an intersection of two quasi-separatrix layers. The recurrence of the X-shaped flares might be attributed to the repetitive formation and dissipation of the CS, as driven by the photospheric footpoint motions. These results demonstrate the power of a data-constrained MHD model in reproducing a CS in the corona as well as providing insight into the magnetic mechanism of solar flares.
项目资助者National Natural Science Foundation of China(41574170, 41574171, 41531073, 41374176, 41231068, 11373066) ; Shenzhen Technology Project(JCYJ20170307150645407) ; Specialized Research Fund for State Key Laboratories ; NSF(AGS-1650854)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
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WOS记录号WOS:000415152100008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MAGNETIC RECONNECTION ; SOLAR CORONA ; ORIGIN ; FIELDS
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11959
专题抚仙湖太阳观测站
通讯作者Jiang, Chaowei(Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen 518055, Peoples R China)
作者单位1.Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055, China
2.Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, Huntsville, AL 35899, USA
3.SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
4.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu Districk, Kunming 650216, Yunnan, China
5.Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China
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Jiang, Chaowei,Yan, Xiaoli,Feng, Xueshang,et al. Reconstruction of a Large-scale Pre-flare Coronal Current Sheet Associated with a Homologous X-shaped Flare[J]. ASTROPHYSICAL JOURNAL,2017,850(1).
APA Jiang, Chaowei.,Yan, Xiaoli.,Feng, Xueshang.,Duan, Aiying.,Hu, Qiang.,...&Jiang, Chaowei.(2017).Reconstruction of a Large-scale Pre-flare Coronal Current Sheet Associated with a Homologous X-shaped Flare.ASTROPHYSICAL JOURNAL,850(1).
MLA Jiang, Chaowei,et al."Reconstruction of a Large-scale Pre-flare Coronal Current Sheet Associated with a Homologous X-shaped Flare".ASTROPHYSICAL JOURNAL 850.1(2017).
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