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题名:
KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT
作者: Yan XL(闫晓理)1,2; Xue ZK(薛志科)1; Liu, JH3; Ma L(马琳)1; Kong DF(孔德芳)1; Qu ZQ(屈中权)1; Li, Z2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2014-02-20
卷号: 782, 期号:2
DOI: 10.1088/0004-637X/782/2/67
学科分类: Astronomy & Astrophysics
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Yan, XL (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
关键词: Sun: activity ; Sun: corona ; Sun: filaments, prominences
英文摘要: Kink instability is a possible mechanism for solar filament eruption. However, it is very difficult to directly measure the twist of the solar filament from observation. In this paper, we measured the twist of a solar filament by analyzing its leg rotation. An inverse S-shaped filament in the active region NOAA 11485 was observed by the Atmospheric Imaging Assembly of the Solar Dynamics Observatory on 2012 May 22. During its eruption, the leg of the filament exhibited a significant rotation motion. The 304 angstrom images were used to uncurl the circles, the centers of which are the axis of the filament's leg. The result shows that the leg of the filament rotated up to about 510 degrees (about 2.83 pi) around the axis of the filament within 23 minutes. The maximal rotation speed reached 100 degrees/minute (about 379.9 km s(-1) at radius 18 ''), which is the fastest rotation speed reported. We also calculated the decay index along the polarity inversion line in this active region and found that the decline of the overlying field with height is not fast enough to trigger the torus instability. According to the kink instability condition, this indicates that the kink instability is the trigger mechanism for the solar filament eruption.
项目资助者: National Science Foundation of China (NSFC) [11373066, 11373065, 11178016] ; Yunnan Science Foundation of China [2013FB086] ; Chinese Academy of Sciences ; National Basic Research Program of China 973 [G2011CB811400] ; HeBei Natural Science Foundation of China [A2010001942] ; Foundation of Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University)
语种: 英语
原文出处: 查看原文
ISSN号: 0004-637X
文章类型: Article
归档日期: 2014-02-26
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: CORONAL MASS EJECTION ; SOLAR-FLARES ; FLUX ROPES ; SUNSPOT ROTATION ; MAGNETIC-FIELDS ; PROMINENCES ; STABILITY ; ERUPTION ; LOOPS ; EVOLUTION
WOS记录号: WOS:000334584700009
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/4709
Appears in Collections:抚仙湖太阳观测站_期刊论文

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作者单位: 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China
3.Department of Physics, Shijiazhuang University, Shijiazhuang 050035, China

Recommended Citation:
Yan XL,Xue ZK,Liu, JH,et al. KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT[J]. ASTROPHYSICAL JOURNAL,2014,782(2).
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