Results of numerical 3D simulations of propagation of acoustic waves insidethe Sun are presented. A linear 3D code which utilizes realistic OPAL equationof state was developed by authors. Modified convectively stable standard solarmodel with smoothly joined chromosphere was used as a background model. Highorder dispersion relation preserving numerical scheme was used to calculatespatial derivatives. The top non-reflecting boundary condition established inthe chromosphere absorbs waves with frequencies greater than the acousticcut-off frequency which pass to the chromosphere, simulating a realisticsituation. The acoustic power spectra obtained from the wave field generated bysources randomly distributed below the photosphere are in good agreement withobservations. The influence of the height of the top boundary on results ofsimulation was studied. It was shown that the energy leakage through theacoustic potential barrier damps all modes uniformly and does not change theshape of the acoustic spectrum. So the height of the top boundary can be usedfor controlling a damping rate without distortion of the acoustic spectrum. Thedeveloped simulations provide an important tool for testing localhelioseismology.
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