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Numerical Simulation of Scattering of Helioseismic MHD Waves by Sunspots

K.    V. PARCHEVSKY, A. G. KOSOVICHEV

Abstract


We present results of numerical 3D simulation of interaction of MHD waves with the sunspot. Self consistent magnetohydrostatic model of the sunspot was chosen as the background model. Using filtering technique we separated magnetoacoustic and magnetogravity waves. It is shown, that inside the sunspot magnetoacoustic and magnetogravity waves are not spatially separated unlike the case of the horizontally uniform background model. The sunspot causes anisotropy of the amplitude distribution along the wavefront and changes the shape of the wavefront. The amplitude of the waves is reduced inside the sunspot. This effect is stronger for the magnetogravity waves than for magnetoacoustic waves. The shape of the wavefront of the magnetogravity waves is distorted stronger as well.

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