Magnetic Field Configuration and Evolution of a Highly Flare-producitve Region NOAA 10808 (2005-Sep)

Details Magnetic Field Configuration and Evolution of a Highly Flare-producitve Region NOAA 10808 (2005-Sep) Magnetic Field Configuration and Evolution of a Highly Flare-producitve Region NOAA 10808 (2005-Sep)

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..59i&link_type=abstract

Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R

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Scientific paper

Active regions on the Sun have different flare productivities with each other. Some regions produce many large flares, while others produce no flares. The key factor of a high flare productivity is the complexity of magnetic field configuration of the region. In our previous studies, we found that the twisted structure of emerging magnetic flux bundles is the essential feature of flare-productive active regions. Vector magnetic field data sets are necessary to examine the twisted magnetic field structures (e.g., shear and helicity). Recently we have constructed our new telescope, Solar Magnetic Activity Research Telescope (SMART) at Hida Observatory, Kyoto University. We can obtain high resolution full disk H-alpha images (with Lyot filter; H-alpha center, blue and reg wing) and full disk vector magnetograms with SMART. The active region NOAA 10808 showed the highest flare activity during the current solar cycle (cycle 23) in September 2005. We studied the formation process of delta-type magnetic configuration using SOHO/MDI magnetograms and flares using TRACE data. We also studied the evolution of magnetic shear and H-alpha filaments using H-alpha full disk images and full disk vector magnetograms obtained with SMART. In this paper, we summarize the characteristics of magnetic field configuration of this region and discuss the relation between the configuration and the high flare activity.

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