Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547...87s&link_type=abstract
Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a
Other
Scientific paper
The observed power spectrum of high-degree solar pmodes ( > 200) shows discrepancies with the power spectrum predicted by the stochastic excitation and damping theory. In an attempt to explain these discrepancies, the present paper is concerned with the influence of the observed subsurface flows on the trapped acoustic modes (p-modes). The effect of these inhomogeneous background flows is investigated by means of a nonmodal analysis and a multi-layer model. It is shown that the rotational and meridional components of the velocity field change the wavelengths of the oscillation modes which, in turn, results in modifications of the corresponding modal frequencies. The magnitudes of the frequency residuals depend on the spatial scales of the modes and on the gradients of the different components of the flow velocity. Together with other mechanisms (e.g. the scattering of modes by the convective motions [1]), the nonmodal effect of the variation of the frequencies in time contributes: 1) to the observed widening of the corresponding peaks in the observed power spectrum with increasing angular degree; 2) to the partial dissipation of spectral power, and, as a result, 3) to the discrepancies between the predicted and the observed power spectrum of solar p-modes.
Poedts Stefaan
Shergelashvili Bidzina M.
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