KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT

	KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT
	Yan XL(闫晓理)1,2 ; Xue ZK(薛志科)1 ; Liu, JH 3; Ma L(马琳)1; Kong DF(孔德芳)1 ; Qu ZQ(屈中权)1 ; Li, Z 2
刊名	ASTROPHYSICAL JOURNAL
	2014-02-20
卷号	782 期号:2
关键词	Sun: activity Sun: corona Sun: filaments, prominences
ISSN号	0004-637X
通讯作者	Yan, XL (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	CORONAL MASS EJECTION ; SOLAR-FLARES ; FLUX ROPES ; SUNSPOT ROTATION ; MAGNETIC-FIELDS ; PROMINENCES ; STABILITY ; ERUPTION ; LOOPS ; EVOLUTION
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/782/2/67/meta
语种	英语
WOS记录号	WOS:000334584700009
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4709]
专题	云南天文台_抚仙湖太阳观测站
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
推荐引用方式 GB/T 7714	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).
APA	Yan XL.,Xue ZK.,Liu, JH.,Ma L.,Kong DF.,...&Li, Z.(2014).KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT.ASTROPHYSICAL JOURNAL,782(2).
MLA	Yan XL,et al."KINK INSTABILITY EVIDENCED BY ANALYZING THE LEG ROTATION OF A FILAMENT".ASTROPHYSICAL JOURNAL 782.2(2014).