SOLAR TORSIONAL OSCILLATIONS: HELIOSEISMIC MEASUREMENTS VERSUS DYNAMO MODELLING

We compare the variations in the solar internal rotation ("torsional oscillations"), as measured with SOHO MDI and GONG data, with predictions of a nonlinear axisymmetric mean-field dynamo model in a spherical shell, in which the only nonlinearity is due to action of the Lorentz force on the angular velocity. The overall picture of the torsional oscillations reveals a number of striking similarities between the model predictions and the seismic observations.