Propagation of an optically thin isothermal perturbation in an atmosphere traversed by a radiation field

Details Propagation of an optically thin isothermal perturbation in an atmosphere traversed by a radiation field Propagation of an optically thin isothermal perturbation in an atmosphere traversed by a radiation field

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47..413b&link_type=abstract

Astronomy and Astrophysics, vol. 47, no. 3, Mar. 1976, p. 413-416.

Computer Science

Sound

9

Acoustic Propagation, Atmospheric Heating, Chromosphere, Hot Stars, Optical Thickness, Stellar Atmospheres, Absorptance, Astronomical Models, Isothermal Layers, Perturbation Theory, Radiative Transfer, Sound Waves

Scientific paper

The propagation of optically thin isothermal perturbations in an isothermal slab of an atmosphere traversed by a radiation flux is considered. Such perturbations are amplified during their propagation up to a finite limit which is a function of the effective gravity, and which becomes infinite only in the rather unrealistic case where this effective gravity is zero. Although this result depends on the assumption made for the absorption coefficient, it shows that a nonlocal analysis of the amplification is needed in order to be able to apply it to the chromospheric heating of hot stars, a mechanism suggested by Hearn (1972).

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