Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..340s&link_type=abstract
Astronomy and Astrophysics, Vol. 272, p. 340 (1993)
Astronomy and Astrophysics
Astrophysics
12
Turbulence, Viscosity, Solar Oscillations
Scientific paper
A Fourier transform method is used to derive shear and volume eddy viscosities arising from small-scale turbulent motions in the solar convection zone. For homogeneous and isotropic turbulence the volume viscosity exceeds the shear viscosity by a factor 6. For oscillations with a large-scale spatial structure the viscosities depend on the frequency of oscillation in the form exp(- |ωoscτcorr|), where τcorr is the correlation time of the turbulence. This dependence restricts the damping effect upon the solar p modes to a layer of at most several thousand kilometers just below the Sun's surface.
The damping rates of radial solar p modes were calculated with the help of an energy integral. The result is that turbulent damping may account for up to 20% of the total damping derived from the observed width of the lines in the oscillation spectrum. If convective overshoot into the solar atmosphere is included, the effect increases to 25 - 30%.
Grabowski U.
Knölker Michael
Rudiger Günther
Stix Michael
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