RADIATION-HYDRODYNAMIC WAVES AND GLOBAL SOLAR OSCILLATIONS

We investigate nonadiabatic hydrodynamic waves in a nongrey, radiating , thermally conducting, homogeneous atmosphere in LTE with a finite me an free path of photons. Avoiding the Eddington approximation the rema ining simplifications in the basic equations are discussed, the genera lized dispersion relation is analysed, and some wave properties in a g rey model are studied. The properties of waves in a stratified atmosph ere are analysed as well. In connection with the predicted properties of the nonadiabatic waves we discuss observations of p-modes by measur ing brightness fluctuations.