Coronal Magnetic Connectivity and EUV Dimmings

Coronal Magnetic Connectivity and EUV Dimmings
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日冕磁连接和 EUV 调光

DOI:
10.1007/s11207-007-0229-3
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发表时间:
2007-05
期刊:
影响因子:
2.8
通讯作者:
Yang, Zhiliang
Yang, Zhiliang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Harra, Louise K.;Attrill, Gemma D. R.;Wang, Jingxiu;He, Xiangtao;Zhang, Yuzong;Yang, Zhiliang

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日冕变暗可以被认为是正面日冕物质抛射(cme)的盘状特征(Thompsonet al.: 2000,地球物理学)。(参见《书信》27,1431)。研究与日冕变暗相关的磁连通性可以为cme的磁性质提供新的线索。本文分析了发生在2000年7月14日、2003年10月28日、2004年11月7日和2005年1月15日的4次耀斑cme事件。它们都是与复杂活动区(ARs)的主要耀斑活动有关的日冕物质抛射,并产生了严重的空间天气后果。为了探索这些日冕物质抛射的磁连通性,基于太阳和日球层天文台的迈克尔逊多普勒成像仪的综合天气磁图构建了全球势场外推,并通过极紫外成像望远镜揭示了它们与日冕变暗的关系。研究发现,每次耀斑抛射事件都涉及到十多组磁环系统的相互作用。这些环系统占可见半球所有已确定的环系统的50%以上,覆盖了太阳经纬度的广泛范围。我们将环路系统分类为有源区域环路(ARLs), ar互连环路(ARILs),包括交换环路(TLs),以及跨越灯丝通道的长拱廊(LAs)。由aril组成的鞍场结构(SFC)是一种反复出现的模式,发现在所有四次主要的耀斑cme事件中都存在。本研究揭示的磁连通性表明,大型日冕物质抛射需要多个磁环系统的相互耦合和相互作用。为了进行比较,我们选择了1997年5月12日的一次简单的耀斑cme事件,其磁结构相对简单。即使对于这种简单的耀斑- cme事件,我们也发现存在多个通量环系统。
Coronal dimming can be considered to be a disk signature of front-side coronal mass ejections (CMEs) (Thompsonet 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 theSolar and Heliospheric Observatoryare 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.
DOI: 10.1023/a:1005123319045
发表时间: 1999-06
期刊: Solar Physics
影响因子: 2.8
作者:
F. Fárník;Marian Karlický;Z. Svestka
通讯作者: F. Fárník;Marian Karlický;Z. Svestka
DOI: 10.1007/s11207-006-0181-7
发表时间: 2006-12
期刊: Solar Physics
影响因子: 2.8
作者:
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通讯作者: Y. Wen;Jingxiu Wang;D. Maia;Yuzong Zhang;Hui Zhao;Guiping Zhou
DOI: 10.1002/asna.2113110515
发表时间: 1990
影响因子: 0.9
作者:
J. Linke;B. Ioshpa;V. Selivanov
通讯作者: J. Linke;B. Ioshpa;V. Selivanov
DOI: 10.1134/1.1862362
发表时间: 2005-02
期刊: Astronomy Reports
影响因子: 1
作者:
I. Chertok;V. Grechnev
通讯作者: I. Chertok;V. Grechnev
DOI: 10.1007/s11207-005-3654-1
发表时间: 2005-06
期刊: Solar Physics
影响因子: 2.8
作者:
I. Chertok;V. Grechnev
通讯作者: I. Chertok;V. Grechnev