TRACKING THE EVOLUTION OF A COHERENT MAGNETIC FLUX ROPE CONTINUOUSLY FROM THE INNER TO THE OUTER CORONA

	TRACKING THE EVOLUTION OF A COHERENT MAGNETIC FLUX ROPE CONTINUOUSLY FROM THE INNER TO THE OUTER CORONA
	Cheng, X.; Ding, M. D.; Guo, Y.; Zhang, J.; Vourlidas, A.; Liu, Y. D.; Olmedo, O.; Sun, J. Q.; Li, C.
刊名	ASTROPHYSICAL JOURNAL
	2014
卷号	780 期号:1 页码:28
关键词	Sun: corona Sun: coronal mass ejections (CMEs) Sun: flares Sun: magnetic fields
ISSN号	0004-637X
通讯作者	Cheng, X (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
英文摘要	The magnetic flux rope (MFR) is believed to be the underlying magnetic structure of coronal mass ejections (CMEs). However, it remains unclear how an MFR evolves into and forms the multi-component structure of a CME. In this paper, we perform a comprehensive study of an extreme-ultraviolet (EUV) MFR eruption on 2013 May 22 by tracking its morphological evolution, studying its kinematics, and quantifying its thermal property. As EUV brightenings begin, the MFR starts to rise slowly and shows helical threads winding around an axis. Meanwhile, cool filamentary materials descend spirally down to the chromosphere. These features provide direct observational evidence of intrinsically helical structure of the MFR. Through detailed kinematical analysis, we find that the MFR evolution has two distinct phases: a slow rise phase and an impulsive acceleration phase. We attribute the first phase to the magnetic reconnection within the quasi-separatrix layers surrounding the MFR, and the much more energetic second phase to the fast magnetic reconnection underneath the MFR. We suggest that the transition between these two phases is caused by the torus instability. Moreover, we identify that the MFR evolves smoothly into the outer corona and appears as a coherent structure within the white-light CME volume. The MFR in the outer corona was enveloped by bright fronts that originated from plasma pile-up in front of the expanding MFR. The fronts are also associated with the preceding sheath region followed by the outmost MFR-driven shock.
学科主题	空间物理
收录类别	SCI
语种	英语
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.cssar.ac.cn/handle/122/1497]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Cheng, X.,Ding, M. D.,Guo, Y.,et al. TRACKING THE EVOLUTION OF A COHERENT MAGNETIC FLUX ROPE CONTINUOUSLY FROM THE INNER TO THE OUTER CORONA[J]. ASTROPHYSICAL JOURNAL,2014,780(1):28.
APA	Cheng, X..,Ding, M. D..,Guo, Y..,Zhang, J..,Vourlidas, A..,...&Li, C..(2014).TRACKING THE EVOLUTION OF A COHERENT MAGNETIC FLUX ROPE CONTINUOUSLY FROM THE INNER TO THE OUTER CORONA.ASTROPHYSICAL JOURNAL,780(1),28.
MLA	Cheng, X.,et al."TRACKING THE EVOLUTION OF A COHERENT MAGNETIC FLUX ROPE CONTINUOUSLY FROM THE INNER TO THE OUTER CORONA".ASTROPHYSICAL JOURNAL 780.1(2014):28.