Characterization of grand minima in a spherical-2D non-kinematic mean-field dynamo model

Corinne Simard ( Université de Montréal )

Recent progress in the development of global MHD simulations of solar convection has significantly improved our understanding of the solar dynamo. However, even for the longest-duration extant such simulations, it is not yet possible to properly characterize the long-term variations of the magnetic cycles developing therein. In this context, we construct a non-kinematic axisymmetric mean field dynamo model where the Lorentz force is implemented on the azimuthal flow component and act as the saturation mechanism for the dynamo. This new model also covers a full meridional plane and includes a full alpha-tensor in addition to the differential rotation profile, both both extracted from Eulag-MHD(HD). The resulting dynamo models support a wide range of magnetic solutions where intermittency, amplitude modulation and grand minima are observed. I will present solutions showing some of those features along with its corresponding torsional oscillation.