NAOC Open IR  > 太阳物理研究部
Coronal magnetic connectivity and EUV dimmings
Zhang, Yuzong; Wang, Jingxiu; Attrill, Gemma D. R.; Harra, Louise K.; Yang, Zhiliang; He, Xiangtao
2007-04-01
发表期刊SOLAR PHYSICS
卷号241期号:2页码:329-349
摘要Coronal dimming can be considered to be a disk signature of front-side coronal mass ejections (CMEs) (Thompson et al.: 2000, Geophys. Res. Lett. 27, 1431). The study of the magnetic connectivity associated with coronal dimming can shed new light on the magnetic nature of CMEs. In this study, four major flare-CME events on 14 July 2000, 28 October 2003, 7 November 2004, and 15 January 2005 are analyzed. They were all halo CMEs associated with major flare activity in complex active regions (ARs) and produced severe space weather consequences. To explore the magnetic connectivity of these CMEs, global potential-field extrapolations based on the composite synoptic magnetograms from the Michelson Doppler Imager onboard the Solar and Heliospheric Observatory are constructed, and their association with coronal dimming is revealed by the Extreme ultraviolet Imaging Telescope. It is found that each flare-CME event involved interaction of more than ten sets of magnetic-loop systems. These loop systems occupied over 50% of all identified loop systems in the visible hemisphere and covered a wide range of solar longitudes and latitudes. We categorize the loop systems as active-region loops (ARLs), AR-interconnecting loops (ARILs) including transequatorial loops (TLs), and long arcades (LAs) straddling filament channels. A recurring pattern, the saddle-field configuration (SFC), consisting of ARILs, is found to be present in all four major flare-CME events. The magnetic connectivity revealed by this work implies that intercoupling and interaction of multiple flux-loop systems are required for a major CME. For comparison, a simple flare-CME event of 12 May 1997 with a relatively simple magnetic configuration is chosen. Even for this simple flare-CME event, we find that multiple flux-loop systems are also present.
DOI10.1007/s11207-007-0229-3
收录类别SCI
语种英语
WOS记录号WOS:000247458200010
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被引频次:24[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8973
专题太阳物理研究部
作者单位1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
3.UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
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Zhang, Yuzong,Wang, Jingxiu,Attrill, Gemma D. R.,et al. Coronal magnetic connectivity and EUV dimmings[J]. SOLAR PHYSICS,2007,241(2):329-349.
APA Zhang, Yuzong,Wang, Jingxiu,Attrill, Gemma D. R.,Harra, Louise K.,Yang, Zhiliang,&He, Xiangtao.(2007).Coronal magnetic connectivity and EUV dimmings.SOLAR PHYSICS,241(2),329-349.
MLA Zhang, Yuzong,et al."Coronal magnetic connectivity and EUV dimmings".SOLAR PHYSICS 241.2(2007):329-349.
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