A comparison between magnetic shear and flare shear in a well-observed M-class flare

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

	A comparison between magnetic shear and flare shear in a well-observed M-class flare
	Zhou, Tuan-Hui1,2 ; Ji, Hai-Sheng1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2009-03-01
卷号	9 期号:3 页码:323-332
关键词	Sun: flare Sun: magnetic field Sun: sunspot
ISSN号	1674-4527
英文摘要	We give an extensive multi-wavelength analysis of an eruptive M1.0/1N class solar flare, which occurred in the active region NOAA 10044 on 2002 July 26. Our emphasis is on the relationship between magnetic shear and flare shear. Flare shear is defined as the angle formed between the line connecting the centroids of the two ribbons of the flare and the line perpendicular to the magnetic neutral line. The magnetic shear is computed from vector magnetograms observed at Big Bear Solar Observatory (BBSO), while the flare shear is computed from Transition Region and Coronal Explorer (TRACE) 1700 A images. By a detailed comparison, we find that: 1) The magnetic shear and the flare shear of this event are basically consistent, as judged from the directions of the transverse magnetic field and the line connecting the two ribbons' centroids. 2) During the period of the enhancement of magnetic shear, flare shear had a fast increase followed by a fluctuated decrease. 3) When the magnetic shear stopped its enhancement, the fluctuated decreasing behavior of the flare shear became very smooth. 4) Hard X-ray (HXR) spikes are well correlated with the unshearing peaks on the time profile of the rate of change of the flare shear. We give a discussion of the above phenomena.
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]	SOLAR VECTOR MAGNETOGRAMS ; X-CLASS FLARES ; RAPID CHANGES ; CONVERGING MOTION ; FLUX EMERGENCE ; ACTIVE REGIONS ; CURRENT SHEET ; RAY SOURCES ; H-ALPHA ; FIELD
收录类别	SCI
语种	英语
WOS记录号	WOS:000264845200007
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1553]
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, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Tuan-Hui,Ji, Hai-Sheng. A comparison between magnetic shear and flare shear in a well-observed M-class flare[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(3):323-332.
APA	Zhou, Tuan-Hui,&Ji, Hai-Sheng.(2009).A comparison between magnetic shear and flare shear in a well-observed M-class flare.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(3),323-332.
MLA	Zhou, Tuan-Hui,et al."A comparison between magnetic shear and flare shear in a well-observed M-class flare".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.3(2009):323-332.