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Large-Scale Magnetic Connectivity in CMEs

Published online by Cambridge University Press:  01 November 2006

Yuzong Zhang ,
Jingxiu Wang ,
Gemma Attrill  and
Louise K. Harra
Yuzong Zhang
Affiliation:
Solar Magnetism and Activity Group, NAOC, China Department of Astronomy, Beijing Normal University, China
Jingxiu Wang
Affiliation:
Solar Magnetism and Activity Group, NAOC, China Mullard Space Science Laboratory, UCL, UK
Gemma Attrill
Affiliation:
Mullard Space Science Laboratory, UCL, UK
Louise K. Harra
Affiliation:
Solar Magnetism and Activity Group, NAOC, China Mullard Space Science Laboratory, UCL, UK
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Abstract

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Five flare/CME events were selected in this study. One is on May 12, 1997, for which there is only two active regions on the visible solar disc, and the magnetic configuration is rather simple. For other cases, many active regions were visible. They are the flare/CME events that occurred on Bastille Day of 2000, Oct. 28, 2003, Nov. 7, 2004 and Jan. 20, 2005. By tracing the spread of EUV dimming, which was obtained by SOHO/EIT 195 Å fixed-difference images, we studied the CME initiation and development on the solar disc. At the same time we reconstructed the 3D magnetic structure of coronal magnetic fields, extrapolated from the observed photospheric magnetograms by SOHO/MDI. In scrutinizing the EUV brightening and dimming propagation from CME initiation sites to large areas with different magnetic connectivities, we determine the overall coupling and interacting of multiple flux systems in the CME processes. Several typical patterns of magnetic connectivity are described and discussed in the view of CME initiation mechanism or mechanisms.

Keywords

sun-magnetic fieldsun-coronal mass ejection
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 357 - 360
Copyright
© 2006 International Astronomical Union