TOWARDS A HYDRODYNAMICAL MODEL PREDICTING THE OBSERVED SOLAR ROTATIONPROFILE

We present here the results of a numerical study performed to investig ate the role of gravity waves in the evolution of the solar rotation p rofile. We show that, together with meridional circulation and shear t urbulence, they may enforce solid body rotation in the solar interior. The transient phase is characterized by an outer portion of the radia tive zone rotating at the velocity of the convection zone and an inner portion in strong differential rotation with depth. The gravity waves slow down the outer portion, whereas it is the meridional circulation which dominates the transport of momentum in the interior. With our t reatment of the excitation and damping of these waves, solid body rota tion is achieved on a timescale of a few gi,aa-years, depending on the initial velocity of the model.