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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 XL(闫晓理)4; Feng, Xueshang1,3; Duan, Aiying5; Hu, Qiang2; Zuo, Pingbing1,3; Wang, Yi1,3
Source PublicationASTROPHYSICAL JOURNAL
2017-11-20
Volume850Issue:1
DOI10.3847/1538-4357/aa917a
Contribution Rank第4完成单位
Indexed BySCI
KeywordMagnetic Fields Magnetohydrodynamics (Mhd) Methods: Numerical Sun: Corona Sun: Flares
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[41574170] ; National Natural Science Foundation of China[41574171] ; National Natural Science Foundation of China[41531073] ; National Natural Science Foundation of China[41374176] ; National Natural Science Foundation of China[41231068] ; National Natural Science Foundation of China[11373066] ; Shenzhen Technology Project[JCYJ20170307150645407] ; Specialized Research Fund for State Key Laboratories ; NSF[AGS-1650854]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000415152100008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMAGNETIC RECONNECTION ; SOLAR CORONA ; ORIGIN ; FIELDS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11959
Collection抚仙湖太阳观测站
Corresponding AuthorJiang, Chaowei
Affiliation1.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
Recommended Citation
GB/T 7714
Jiang, Chaowei,Yan XL,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 XL.,Feng, Xueshang.,Duan, Aiying.,Hu, Qiang.,...&Wang, Yi.(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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