Abstract
A new numerical magnetohydrodynamic (MHD) model is developed to study the evolution of an active region due to photospheric converging motion, which leads to magnetic energy buildup in the form of electric current. Because this new MHD model has incorporated finite conductivity, the energy conversion occurs from magnetic mode to thermal mode through joule dissipation. In order to test the causality relationship between the occurence of flare and photospheric motion, a multiple pole configuration with neutral point is used for this numerical simulation study. Using these numerically simulated results we find that in addition to the converging motion, the initial magnetic field configuration and the redistribution of the magnetic flux at photospheric level will enhance the possibility for the development of a flare.
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