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FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520
Cheng, X1,2,3; Ding, MD1,3; Zhang, J1,4; Sun, XD5; Guo, Y1,3; Wang, YM6; Berhard Kliem7,8; Deng, YY2; Cheng, X (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2014-07-10
卷号789期号:2
DOI10.1088/0004-637X/789/2/93
产权排序第8完成单位
收录类别SCI
关键词Sun: Corona Sun: Coronal Mass Ejections (Cmes) Sun: Magnetic Fields Sun: Filaments Prominences
摘要In this paper, we address the formation of a magnetic flux rope (MFR) that erupted on 2012 July 12 and caused a strong geomagnetic storm event on July 15. Through analyzing the long-term evolution of the associated active region observed by the Atmospheric Imaging Assembly and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, it is found that the twisted field of an MFR, indicated by a continuous S-shaped sigmoid, is built up from two groups of sheared arcades near the main polarity inversion line a half day before the eruption. The temperature within the twisted field and sheared arcades is higher than that of the ambient volume, suggesting that magnetic reconnection most likely works there. The driver behind the reconnection is attributed to shearing and converging motions at magnetic footpoints with velocities in the range of 0.1-0.6 km s(-1). The rotation of the preceding sunspot also contributes to the MFR buildup. Extrapolated three-dimensional non-linear force-free field structures further reveal the locations of the reconnection to be in a bald-patch region and in a hyperbolic flux tube. About 2 hr before the eruption, indications of a second MFR in the form of an S-shaped hot channel are seen. It lies above the original MFR that continuously exists and includes a filament. The whole structure thus makes up a stable double-decker MFR system for hours prior to the eruption. Eventually, after entering the domain of instability, the high-lying MFR impulsively erupts to generate a fast coronal mass ejection and X-class flare; while the low-lying MFR remains behind and continuously maintains the sigmoidicity of the active region.
项目资助者NSFC [10933003, 11303016, 11373023, 11203014] ; NKBRSF [2011CB811402, 2014CB744203] ; Key Laboratory of Solar Activity of National Astronomical Observatories of the Chinese Academy of Sciences [KLSA201311] ; NSF [ATM-0748003, AGS-1156120, AGS-1249270] ; DFG ; ChineseAcademy of Sciences [2012T1J0017]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000338674900002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; EMISSION MEASURE ANALYSIS ; X-RAY TELESCOPE ; VECTOR MAGNETOGRAPH ; INDUCTION EQUATION ; TUBE EMERGENCE ; ERUPTION ; EVOLUTION ; PROMINENCE ; FIELD
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6246
专题太阳物理研究组
通讯作者Cheng, X (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
作者单位1.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3.Key Laboratory for Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China
4.School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, VA 22030, USA
5.W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA
6.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
7.Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam, Germany
8.Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
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Cheng, X,Ding, MD,Zhang, J,et al. FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520[J]. ASTROPHYSICAL JOURNAL,2014,789(2).
APA Cheng, X.,Ding, MD.,Zhang, J.,Sun, XD.,Guo, Y.,...&Cheng, X .(2014).FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520.ASTROPHYSICAL JOURNAL,789(2).
MLA Cheng, X,et al."FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520".ASTROPHYSICAL JOURNAL 789.2(2014).
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