FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520

	FORMATION OF A DOUBLE-DECKER MAGNETIC FLUX ROPE IN THE SIGMOIDAL SOLAR ACTIVE REGION 11520
	Cheng, X.1,2,3; Ding, M. D.1,3; Zhang, J.1,4; Sun, X. D.5; Guo, Y.1,3; Wang, Y. M.6; Kliem, B.7,8; Deng, Y. Y.2
刊名	ASTROPHYSICAL JOURNAL
	2014-07-10
卷号	789 期号:2
关键词	Sun: corona Sun: coronal mass ejections (CMEs) Sun: filaments, prominences Sun: magnetic fields
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000338674900002
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6358]
专题	国家天文台_太阳物理研究部
作者单位	1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 4.George Mason Univ, Sch Phys Astron & Computat Sci, Fairfax, VA 22030 USA 5.Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA 6.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China 7.Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany 8.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Cheng, X.,Ding, M. D.,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, M. D..,Zhang, J..,Sun, X. D..,Guo, Y..,...&Deng, Y. Y..(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).