Solar-like differential rotation and equatorward migration in a convective dynamo with a coronal envelope

TL;DR

This study uses convective turbulent dynamo simulations with a coronal layer to demonstrate solar-like equatorward magnetic field migration, differential rotation, and meridional circulation, providing insights into solar magnetic behavior.

Contribution

It introduces a simulation model including a coronal layer that reproduces key solar magnetic features such as equatorward migration and differential rotation.

Findings

Equatorward migration of magnetic fields similar to solar cycle.

Presence of spoke-like differential rotation.

Anti-solar meridional circulation observed.

Abstract

We present results of convective turbulent dynamo simulations including a coronal layer in a spherical wedge. We find an equatorward migration of the radial and azimuthal fields similar to the behavior of sunspots during the solar cycle. The migration of the field coexist with a spoke-like differential rotation and anti-solar (clockwise) meridional circulation. Even though the migration extends over the whole convection zone, the mechanism causing this is not yet fully understood.