INFLUENCE OF PHYSICAL EFFECTS ON THE SOLAR P-MODE SPECTRUM

We study the influence of several modifications in the physics of the Sun on the p-mode frequencies. Finally we put most of them together to produce a model which leads to a significantly better fit than the st andard model. The tested modifications are: overshooting at the bottom of the convective envelope and a variable mixing length, increase of the opacity below the convective envelope or in the surface layers, im provement of the Debye-Huckel correction and modification of the parti tion functions. It turns out that the discrepancies between observatio ns and the predictions of the standard model can be significantly redu ced by the increase of opacities below the convective envelope and by improvements in the physics of the surface layers.