Sound Speed in a Random Flow and Turbulent Shifts of the Solar Eigenfrequencies
Open Access
- 1 May 1998
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 498 (1) , 458-464
- https://doi.org/10.1086/305522
Abstract
Perturbation theory is used to calculate the frequency shift of acoustic modes of a homogeneous turbulent fluid and the frequency shifts of solar modes due to turbulent convection. For sound waves in a random flow, the fractional frequency shift is +(11/30)M2 in the long-wavelength limit, and the shift at short wavelengths is -2/3M2, where M is the average Mach number of the flow. In our model of solar convection, the low-degree f-mode shift is positive and unobservably small, whereas the fractional frequency shift at high degrees (l 500) is -M2, where M is the Mach number of convection near the solar surface.Keywords
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