Three-Dimensional Magnetic Topology in the AR10930 based on the Non-Linear Force- Free Modeling

Details Three-Dimensional Magnetic Topology in the AR10930 based on the Non-Linear Force- Free Modeling Three-Dimensional Magnetic Topology in the AR10930 based on the Non-Linear Force- Free Modeling

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh41a1606i&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH41A-1606

Physics

7509 Corona, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Three-dimensional (3D) magnetic field cannot be directly observed by ground observatories and space satellites, because the magnetic field is unfortunately obtained only solar surface. Therefore the reconstruction of 3D coronal magnetic field using only 2D data on the photosphere is the strong tool to help the understanding not only 3D structure but also the solar activities. We have also developed a new Non- linear Force-Free (NLFF) field extrapolation method, based on the extended magnetofrictional model and applied this NLFF solver to the AR NOAA 10930 observed by Hinode/SOT. As a result, we succeeded to reproduce the strong sheared structure on the neutral line before the flare and the post flare loop structure after the flare. However we have some problems such as narrow calculation domain caused by Hinode/SOT,imposed on the artificial sides and top boundary conditions, 180 degree ambiguity and so on. In this study, to overcome these problems, first, the calculation domain is extended 2 times for Hinode/SOT region in the East-West direction and 4 times in the North-South one by connecting between Hinode/SOT data and SOHO/MDI data. Sides and top boundaries are determined by global potential field model form SOHO/MDI (Shiota et al. 2008). From this result, the strong sheared region was reproduce as same as previous one, however, the field line connectivity is different. This result suggests the difference of separatrix structure between every each different boundary condition. Furthermore we will report the results of the 3D field line topology in detail by not only different boundary conditions but also 180 degree ambiguity. We will check the validity of these structures compared with Hinode/XRT.

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