Magnetic field changes associated with three successive M-class solar flares on 2002 July 26

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

	Magnetic field changes associated with three successive M-class solar flares on 2002 July 26
	Wang, Pu 1; Ding, Ming-De 1; Ji, Hai-Sheng2 ; Wang, Hai-Min 3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2011-06-01
卷号	11 期号:6 页码:692-700
关键词	Sun: activity Sun: magnetic field Sun: flares
ISSN号	1009-9271
英文摘要	With an extensive analysis, we study the temporal evolution of magnetic flux during three successive M-class flares in two adjacent active regions: NOAA 10039 and 10044. The primary data are full disk longitudinal magnetograms observed by SOHO/MDI. All three flares are observed to be accompanied by magnetic flux changes. The changes occurred immediately or within 1 similar to 10 minutes after the starting time of the flares, indicating that the changes are obvious consequences of the solar flares. Although changes in many points are intrinsic in magnetic flux, for some sites, it is caused by a rapid expansion motion of magnetic flux. For the second flare, the associated change is more gradual compared with the 'step-function' reported in literature. Furthermore, we use the data observed by the Imaging Vector Magnetograph (IVM) at Mees Solar Observatory to check possible line profile changes during the flares. The results from the IVM data confirm the flux changes obtained from the MDI data. A series of line profiles were obtained from the IVM's observations and analyzed for flux change sites. We find that the fluctuations in the width, depth and central wavelength of the lines are less than 5.0% even at the flare's core. No line profile change is observed during or after the flare. We conclude that the magnetic field changes associated with the three solar flares are not caused by flare emission.
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]	IMAGING VECTOR MAGNETOGRAPH ; RAPID CHANGES ; TRANSIENTS ; ENERGY ; IMAGER
收录类别	SCI
语种	英语
WOS记录号	WOS:000291963900009
公开日期	2012-08-07
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4509]
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.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.New Jersey Inst Technol, Ctr Solar Terr Res, Space Weather Res Lab, Newark, NJ 07102 USA
推荐引用方式 GB/T 7714	Wang, Pu,Ding, Ming-De,Ji, Hai-Sheng,et al. Magnetic field changes associated with three successive M-class solar flares on 2002 July 26[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(6):692-700.
APA	Wang, Pu,Ding, Ming-De,Ji, Hai-Sheng,&Wang, Hai-Min.(2011).Magnetic field changes associated with three successive M-class solar flares on 2002 July 26.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(6),692-700.
MLA	Wang, Pu,et al."Magnetic field changes associated with three successive M-class solar flares on 2002 July 26".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.6(2011):692-700.