Convective overshoot in the photosphere of the sun described by the HarvardSmithsonian Reference Atmosphere (HSRA).
Abstract
The nature of convectivemotion penetration in the solar photosphere described by the HSRA model is investigated by analyzing the balance of mechanical and radiant energy fluxes in that photosphere. A diffusion approximation is used to determine the variation of the radiant energy flux with geometric depth, the limits of applicability of this approximation are obtained, and the velocity of convective motion is derived as a function of geometric depth. The results show that: (1) the HSRA model overestimates the solar radiation flux due to inaccuracies in its description of the continuous spectrum; (2) the semiempirical HSRA model is not in equilibrium with respect to mechanical energy transport by convective motion; and (3) convective overshoot into optically thin photospheric layers is attenuative, in contrast to sudden cessations of convection.
 Publication:

Astrometriia i Astrofizika
 Pub Date:
 1976
 Bibcode:
 1976AAfz...29...94G
 Keywords:

 Convective Flow;
 Photosphere;
 Reference Atmospheres;
 Solar Physics;
 Astronomical Models;
 Atmospheric Optics;
 Energy Transfer;
 Radiative Transfer;
 Velocity Distribution;
 Solar Physics