Analysis of magnetic shear in an X17 solar flare on October 28, 2003

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	Analysis of magnetic shear in an X17 solar flare on October 28, 2003
	Su, Y. N.; Golub, L.; Van Ballegooijen, A. A.; Gros, M.
刊名	SOLAR PHYSICS
	2006-07-01
卷号	236 期号:2 页码:325-349
关键词	HARD X-RAY TRANSITION REGION CORONAL EXPLORER 2-RIBBON FLARE BURSTS TRACE MODEL RECONNECTION FOOTPOINTS EMISSION
ISSN号	0038-0938
英文摘要	An X17 class (GOES soft X-ray) two-ribbon solar flare on October 28, 2003 is analyzed in order to determine the relationship between the timing of the impulsive phase of the flare and the magnetic shear change in the flaring region. EUV observations made by the Transition Region and Coronal Explorer (TRACE) show a clear decrease in the shear of the flare footpoints during the flare. The shear change stopped in the middle of the impulsive phase. The observations are interpreted in terms of the splitting of the sheared envelope field of the greatly sheared core rope during the early phase of the flare. We have also investigated the temporal correlation between the EUV emission from the brightenings observed by TRACE and the hard X-ray (HXR) emission (E > 150 keV) observed by the anticoincidence system (ACS) of the spectrometer SPI on board the ESA INTEGRAL satellite. The correlation between these two emissions is very good, and the HXR sources (RHESSI) late in the flare are located within the two EUV ribbons. These observations are favorable to the explanation that the EUV brightenings mainly result from direct bombardment of the atmosphere by the energetic particles accelerated at the reconnection site, as does the HXR emission. However, if there is a high temperature (T > 20 MK) HXR source close to the loop top, a contribution of thermal conduction to the EUV brightenings cannot be ruled out.
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]	HARD X-RAY ; TRANSITION REGION ; CORONAL EXPLORER ; 2-RIBBON FLARE ; BURSTS ; TRACE ; MODEL ; RECONNECTION ; FOOTPOINTS ; EMISSION
收录类别	SCI
语种	英语
WOS记录号	WOS:000239146100008
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3590]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	1.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China 4.CEA Saclay, Serv Astrophys, DSM, DAPNIA, F-91191 Gif Sur Yvette, France
推荐引用方式 GB/T 7714	Su, Y. N.,Golub, L.,Van Ballegooijen, A. A.,et al. Analysis of magnetic shear in an X17 solar flare on October 28, 2003[J]. SOLAR PHYSICS,2006,236(2):325-349.
APA	Su, Y. N.,Golub, L.,Van Ballegooijen, A. A.,&Gros, M..(2006).Analysis of magnetic shear in an X17 solar flare on October 28, 2003.SOLAR PHYSICS,236(2),325-349.
MLA	Su, Y. N.,et al."Analysis of magnetic shear in an X17 solar flare on October 28, 2003".SOLAR PHYSICS 236.2(2006):325-349.