Overstabilization of acoustic modes in a polytropic atmosphere

Details Overstabilization of acoustic modes in a polytropic atmosphere Overstabilization of acoustic modes in a polytropic atmosphere

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...56..275a&link_type=abstract

Solar Physics, vol. 56, Feb. 1978, p. 275-292.

Computer Science

Sound

10

Frequency Stability, Optical Thickness, Polytropic Processes, Solar Atmosphere, Sound Waves, Energy Dissipation

Scientific paper

The paper is concerned with the growth rates of acoustic modes which can be excited in an unstable compressible layer where thermal dissipation operates. The effects of various boundary conditions and the overstability of sound waves in a polytropic atmosphere are examined for disturbances of arbitrary optical thickness. It is concluded that the Cowling-Spiegel mechanism can operate in the solar convective zone, although the kappa mechanism is predominantly responsible for the observed five-minute oscillations.

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