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Coronal Magnetic Connectivity and EUV Dimmings View all abstracts by submitter

Yuzong Zhang   Submitted: 2007-03-20 03:50

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 July 14 2000, October 28 2003, November 7 2004, and January 15 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 (MDI) onboard the Solar and Heliospheric Observatory (SOHO) are constructed, and their association with coronal dimming revealed by the Extreme ultra-violet Imaging Telescope (EIT) is studied. 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 trans-equatorial 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 inter-coupling 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.

Authors: Yuzong Zhang, Jingxiu Wang, Gemma D. R. Attrill, Louise K. Harra, Zhiliang Yang, Xiangtao He
Projects: None

Publication Status: accepted by Sol. Phys.
Last Modified: 2007-03-20 09:17
Go to main E-Print page  Global coronal seismology  Resonant energy conversion of 3-minute intensity oscillations into Alfven waves in the solar atmosphere  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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