Computational MHD-modeling of appearance of current sheet series over the active region AR 0365

The first attempt is presented for computational MHD modeling of appearance of several current sheets above an active region before series of elementary flares. In the field of each sheet the energy is accumulated which can be released during a flare. Calculations started three days before flare series, that is before new magnetic flux emergence in an active region. The initial (potential) magnetic field was computed from the solution of Laplace equation with the sloped derivative. Boundary conditions were set from maps of measured magnetic field in active region for different moments. The Peresvet program was used for solving the full system of MHD equations with dissipative terms. The absolutely implicit scheme conservative relative to magnetic flux was used. The problem of correct selection of calculation domain size and searching for special magnetic field line position is discussed.