http://arxiv.org/abs/1708.03073
Recent advances in helioseismology, numerical simulations and mean-field theory of the solar differential rotation have shown that the meridional circulation pattern may consist of two or more cells in each hemisphere of the convection zone. Accordingly, to the mean-field theory, the double-cell circulation pattern can result from inversion of the sign of non-diffusive part of the radial angular momentum transport (called the Lambda – effect) in the lower part of the solar convection zone. Here, we argue that this effect results from the radial gradients of the Coriolis force acting on convective flows. Employing the standard solar interior model as input we construct a dynamically self-consistent nonlinear dynamo model that takes into account the detailed description of the Lambda – effect, turbulent pumping, magnetic helicity balance, and magnetic feedback on the differential rotation and meridional circulation. The model explains the observed solar-cycle variations of the differential rotation (‘torsional oscillations’) as a manifestation of Lorentz forces associated with magnetic dynamo wave.
V. Pipin and A. Kosovichev
Fri, 11 Aug 17
29/45
Comments: 24 pages, 5 figures