A SOLAR MODEL WITH IMPROVED SUBATMOSPHERIC STRATIFICATION

The calculated intermediate and high degree p-mode frequencies of stan dard solar models show greater disagreement with the observations than low degree modes. This leads to the conclusion that the subatmospheri c structure of the models has to be improved. We are presenting solar models with up-to-date input physics and controlled numerical accuracy of 10(-5). For the outer boundary condition we use synthetic atmosphe res fitted to the interior solution at tau approximate to 20. In addit ion, a spatially variable mixing length parameter is employed to repro duce the pressure-temperature stratification of the outer convective z one calculated by 2D-hydrodynamical models we used for comparison. Wit h this changed subatmospheric structure we could improve the agreement between predicted and observed p-mode frequencies in our solar models .