Magnetohydrodynamic simulation of a solar flare: 1. Current sheet in the corona |
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| Authors: | A I Podgorny I M Podgorny |
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| Institution: | 1.Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia;2.Institute of Astronomy,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The results of modeling the preflare situation in the solar corona, obtained using a numerical solution for a complete set
of three-dimensional MHD equations, are reviewed. Any assumptions concerning the flare development character or the active
region’s behavior before a flare are not introduced. The initial and boundary conditions on the photosphere are specified
from magnetic field measurements before a flare. The photospheric field sources are approximated by magnetic dipoles. The
usage of the PERESVET program indicated that a current sheet is formed in the vicinity of a singular magnetic field line in
the corona. The sheet is formed due to disturbances coming from the photosphere. The energy necessary for a flare is stored
in the current sheet magnetic field during 2–3 days. The main construction principles of the PERESVET program, which makes
it possible to use the maps of a measured photospheric field as boundary conditions, are presented. |
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