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- Title
Migrating Dynamo Waves and Consequences for Stellar Current Sheets.
- Authors
Maiewski, Evgeniy; Malova, Helmi; Popov, Victor; Sokoloff, Dmitry; Yushkov, Egor
- Abstract
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.
- Subjects
CURRENT sheets; ELECTRIC generators; STELLAR magnetic fields; QUADRUPOLE moments; STELLAR structure; STELLAR activity; SOLAR atmosphere
- Publication
Solar Physics, 2022, Vol 297, Issue 11, p1
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-022-02085-3