Random velocity field corrections of the f-mode. I. Horizontal flows
Abstract
The influence of granulation (modelled as a random flow) on f-mode frequencies is evaluated theoretically for a simple model of the solar plasma. Frequency changes due to the presence of a stochastic flow are calculated analytically in the long wavelength limit, and numerically for arbitrary wavelength. Frequencies ω are close to the parabola ω2 = qk at low and intermediate wavenumbers k; but at high k they fall below the parabola. Such a behaviour is in agreement with recent solar observations.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1993
- Bibcode:
- 1993A&A...272..595M
- Keywords:
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- helioseismology f-mode;
- stochastic field;
- Sun: oscillations;
- Sun granulation MHD