Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...485l..13s&link_type=abstract
Astronomy and Astrophysics, Volume 485, Issue 2, 2008, pp.L13-L16
Astronomy and Astrophysics
Astrophysics
Sun: Flares, Sun: Coronal Mass Ejections (Cmes), Sun: Magnetic Fields
Scientific paper
Aims: We investigate the magnetic evolution of a flare/CME source region to determine the trigger of the flare and the EUV brightening event. Also, we discuss the role of the current helicity (h_c) in solar activity. Methods: We use the long duration sequences of SOHO/MDI magnetograms and TRACE 195 Å images for a super active region (AR), NOAA AR 8375. Magnetic field changes in the photosphere and the corona are investigated. Results: In AR 8375, the southwestern and northwestern parts of an overlying loop (hc < 0) are influenced by the rising magnetic arcades (hc > 0) and the emerging flux region (hc > 0). Two collisions make the overlying loop inflate in a bounce interaction. However, the related solar events are triggered by a merge interaction which takes place among the fibers of the rising magnetic arcades and among those of the overlying loop.
Feng Xiaobing
Shen Fang
Song Wei
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