Acoustic Overstability in a Polytropic Atmosphere
Open Access
- 1 July 1976
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 176 (1) , 145-159
- https://doi.org/10.1093/mnras/176.1.145
Abstract
The stability of sound waves in a polytropic atmosphere with thermal diffusion is discussed. Analytic results are obtained using the quasi-adiabatic approximation, and the consequences of using the optically thin and optically thick approximation are compared. An example is given of overstability with a subadiabatic temperature gradient. The quasi-adiabatic results are then compared with fully non-adiabatic numerical results, using a model of the 5-min oscillation of the Sun.Keywords
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