Migrating Dynamo Waves and Consequences for Stellar Current Sheets

Solar Physics. 2022. Vol. 297. No. 11. Article 150.

Evgeniy Maiewski, Malova H., Popov V., Sokoloff D., Yushkov E.

We study the relation between stellar dynamo-wave propagation and the structure of the stellar magnetic field. Modeling dynamo waves by the well-known Parker migratory dynamo, we vary the intensity of dynamo drivers in order to obtain activity-wave propagation toward the Equator (as in the solar-activity cycle) or towards the Poles. We match the magnetic field in the dynamo-active shell with that in the surrounding stellar material, using a simple dissipative magneto-hydrodynamic system for the transition region. Introducing a weak asymmetry between the stellar hemispheres, we study phase shifts of the dipole, quadrupole, and octupole magnetic components at various distances from the star to demonstrate that a several-percent asymmetry in dynamo drivers is sufficient to obtain a realistic relation between solar dipole and quadrupole moments. We study the behavior of the stellar current sheets and show that for the poleward-propagating activity it is substantially different from solar ones. In particular, we demonstrate conditions in which the conical current sheets propagate opposite to the solar directions.

Keywords: transition region, turbulence, magnetohydrodynamics, Solar cycle, models, Velocity fields, solar wind

Publication based on the results of: Data analysis and modeling of the structure and dynamics of plasma formations and processes in the solar system responsible for solar-terrestrial communications and processes on Earth (2022)