Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.4604p&link_type=abstract
American Astronomical Society Meeting 210, #46.04; Bulletin of the American Astronomical Society, Vol. 39, p.161
Astronomy and Astrophysics
Astronomy
Scientific paper
The damping mechanism of solar modes below the acoustic cut-off frequency is not yet completely understood. Both the scattering on turbulence in subsurface layers and partial escaping waves into the chromosphere may play significant role. Using 3D numerical simulations of wave propagation in the solar atmosphere with the realistic top boundary condition we studied both mechanisms. The wave sources were modeled by stochastic randomly distributed perturbations of vertical component of force. In both cases we were able to reproduce the observed characteristics of the acoustic spectrum (line-widths and relative amplitude distribution). We masked the sources in the central circle to simulate the absence of sources in sunspots, and we found that the oscillation amplitude in regions of suppressed excitation only weakly depends on the wave damping mechanism in the upper convection zone and chromosphere.
Kosovichev Aleksandr G.
Parchevsky Konstantin
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