Acoustic overstability in a polytropic atmosphere

Details Acoustic overstability in a polytropic atmosphere Acoustic overstability in a polytropic atmosphere

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..145j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 145-159.

Computer Science

Sound

17

Frequency Stability, Polytropic Processes, Sound Amplification, Adiabatic Conditions, Atmospheric Models, Optical Thickness, Temperature Gradients, Thermal Diffusion

Scientific paper

The stability of sound waves in a polytropic atmosphere with thermal diffusion is discussed. Analytical results are obtained using the quasi-adiabatic approximation, and the consequences of using the optically thin and optically thick approximations are compared. An example is given of overstability with a subadiabatic temperature gradient. The quasi-adiabatic results are compared with fully nonadiabatic numerical results, using a model of the 5-min oscillation of the sun.

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