YNAO OpenIR  > 太阳物理研究组
STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST
Liu, R1,2; Bernhard Kliem3,4; Titov, VS5; Chen, J1,6; Wang, YM1,2; Wang, HM7,8; Liu, C7,8; Xu, Y7,8; Wiegelmann, T9
发表期刊ASTROPHYSICAL JOURNAL
2016-02-20
卷号818期号:2
DOI10.3847/0004-637X/818/2/148
产权排序第3完成单位
收录类别SCI
关键词coronal mass ejections (CMEs) Sun: corona Sun: filaments, pominences Sun: flares Sun: magnetic fields
摘要

We investigate the evolution of NOAA Active Region (AR) 11817 during 2013 August 10-12, when it developed a complex field configuration and produced four confined, followed by two eruptive, flares. These C-and-above flares are all associated with a magnetic flux rope (MFR) located along the major polarity inversion line, where shearing and converging photospheric flows are present. Aided by the nonlinear force-free field modeling, we identify the MFR through mapping magnetic connectivities and computing the twist number T-w for each individual field line. The MFR is moderately twisted (vertical bar T-w vertical bar < 2) and has a well-defined boundary of high squashing factor Q. We found that the field line with the extremum vertical bar T-w vertical bar is a reliable proxy of the rope axis, and that the MFR's peak vertical bar T-w vertical bar temporarily increases within half an hour before each flare while it decreases after the flare peak for both confined and eruptive flares. This pre-flare increase in vertical bar T-w vertical bar has little effect on the AR's free magnetic energy or any other parameters derived for the whole region, due to its moderate amount and the MFR's relatively small volume, while its decrease after flares is clearly associated with the stepwise decrease in the whole region's free magnetic energy due to the flare. We suggest that T-w may serve as a useful parameter in forewarning the onset of eruption, and therefore, the consequent space weather effects. The helical kink instability is identified as the prime candidate onset mechanism for the considered flares.

资助项目Thousand Young Talents Program of China, NSFC[41222031] ; Thousand Young Talents Program of China, NSFC[41474151] ; NSFC[41131065] ; CAS[KZZD-EW-01-4] ; CAS[2012T1J0017] ; fundamental research funds for the central universities ; DFG ; NSF SHINE program ; NSF[AGS 1348513] ; NSF[1408703] ; NASA[NNX13AG13G] ; NASA[NNX13AF76G]
项目资助者Thousand Young Talents Program of China, NSFC[41222031, 41474151] ; NSFC[41131065] ; CAS[KZZD-EW-01-4, 2012T1J0017] ; fundamental research funds for the central universities ; DFG ; NSF SHINE program ; NSF[AGS 1348513, 1408703] ; NASA[NNX13AG13G, NNX13AF76G]
语种英语
学科领域天文学 ; 太阳与太阳系 ; 太阳物理学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000372302800047
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; SOLAR ACTIVE REGIONS ; FORCE-FREE FIELD ; X-CLASS FLARES ; 2010 APRIL 8 ; KINK INSTABILITY ; HELICITY INJECTION ; VECTOR MAGNETOGRAPH ; PARTIAL ERUPTION ; NOAA 10930
引用统计
被引频次:62[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/114a53/9844
专题太阳物理研究组
通讯作者Liu, R
作者单位1.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026, China
2.Collaborative Innovation Center of Astronautical Science and Technology, Hefei 230026, China
3.Yunnan Observatories, CAS, Kunming 650216, China
4.Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam, Germany
5.Predictive Science Inc., 9990 Mesa Rim Road, Suite 170, San Diego, CA 92121, USA
6.Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
7.Space Weather Research Laboratory, New Jersey Institute of Technology, University Heights, Newark, NJ 07102-1982, USA
8.Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, CA 92314-9672, USA
9.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany
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GB/T 7714
Liu, R,Bernhard Kliem,Titov, VS,et al. STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST[J]. ASTROPHYSICAL JOURNAL,2016,818(2).
APA Liu, R.,Bernhard Kliem.,Titov, VS.,Chen, J.,Wang, YM.,...&Wiegelmann, T.(2016).STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST.ASTROPHYSICAL JOURNAL,818(2).
MLA Liu, R,et al."STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST".ASTROPHYSICAL JOURNAL 818.2(2016).
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