Radiation-hydrodynamic waves in an optically non-grey atmosphere

Details Radiation-hydrodynamic waves in an optically non-grey atmosphere Radiation-hydrodynamic waves in an optically non-grey atmosphere

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278l...9z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 1, p. L9-L12

Astronomy and Astrophysics

Astrophysics

14

Hydrodynamics, Local Thermodynamic Equilibrium, Photosphere, Radiative Transfer, Solar Oscillations, Eddington Approximation, Opacity

Scientific paper

We derive the dispersion equation of radiation-hydrodynamic waves for a nongrey atmosphere in Local Thermodynamic Equilibrium (LTE) avoiding the Eddington approximation. It is shown that the Rosseland mean opacity doesn't describe the relaxation processes in the atmosphere except the opaque limit. For the transparent limit the relaxation time depends on the so-called Newton mean opacity. The grey and nongrey approximations are compared for a model of the solar photosphere.

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