The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳活动的多波段观测研究团组

	The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase
	Zhou, Tuan-Hui1,4,5 ; Wang, Jun-Feng 2; Li, Dong 1,3,5; Song, Qi-Wu1,4,5 ; Melnikov, Victor 1; Ji, Hai-Sheng1,5
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2013-05-01
卷号	13 期号:5 页码:526-536
关键词	Sun: activity Sun: magnetic fields Sun: flares
ISSN号	1674-4527
通讯作者	Zhou, TH (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China. Email: thzhou@pmo.ac.cn
英文摘要	With the aim of studying the relationship between the relative motions of the loop-top (LT) source and footpoints (FPs) during the rising phase of solar flares, we give a detailed analysis of the X7.1 class flare that occurred on 2005 January 20. The flare was clearly observed by RHESSI, showing a distinct X-ray flaring loop with a bright LT source and two well-defined hard X-ray (HXR) FPs. In particular, we correct the projection effect for the positions of the FPs and magnetic polarity inversion line. We find that: (1) The LT source showed an obvious U-shaped trajectory. The source of the higher energy LT shows a faster downward/upward speed. (2) The evolution of FPs was temporally correlated with that of the LT source. The converging/separating motion of FPs corresponds to the downward/upward motion of the LT source. (3) The initial flare shear of this event is found to be nearly 50 degrees, and it has a fluctuating decrease throughout the contraction phase as well as the expansion phase. (4) Four peaks of the time profile of the unshearing rate are found to be temporally correlated with peaks in the HXR emission flux. This flare supports the overall contraction picture of flares: a descending motion of the LT source, in addition to converging and unshearing motion of FPs. All results indicate that the magnetic field was very highly sheared before the onset of the flare.
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]	LARGE SOLAR-FLARES ; MAGNETIC RECONNECTION ; CHROMOSPHERIC EVAPORATION ; CONVERGING MOTION ; CURRENT SHEET ; RAY SOURCES ; RHESSI ; SHRINKAGE ; RELAXATION ; STATISTICS
收录类别	SCI
语种	英语
WOS记录号	WOS:000319640900004
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9956]
专题	紫金山天文台_太阳活动的多波段观测研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Sch Phys Optoelect Engn, Nanjing 210044, Jiangsu, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Tuan-Hui,Wang, Jun-Feng,Li, Dong,et al. The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(5):526-536.
APA	Zhou, Tuan-Hui,Wang, Jun-Feng,Li, Dong,Song, Qi-Wu,Melnikov, Victor,&Ji, Hai-Sheng.(2013).The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(5),526-536.
MLA	Zhou, Tuan-Hui,et al."The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.5(2013):526-536.