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.
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Acknowledgments
E. Maiewski, H. Malova, V. Popov, and D. Sokoloff acknowledge the support of the Ministry of Science and Higher Education of the Russian Federation under the grant N0075-15-2020-780 (N13.1902.21.0039). The Ulysses Final Archive is available at the website ufa.esac.esa.int/ufa/#data, where the directory VHM-FGM contains the Ulysses prime resolution data of the magnetic field. The Ulysses Orbital Information (1990 – 2009) is available as follows: www.cosmos.esa.int/web/ulysses/orbit. E. Yushkov performed dynamo simulations with the financial support of the Ministry of Education and Science of the Russian Federation as part of the program of the Moscow Center for Fundamental and Applied Mathematics under the agreement N0075-15-2019-162.
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Maiewski, E., Malova, H., Popov, V. et al. Migrating Dynamo Waves and Consequences for Stellar Current Sheets. Sol Phys 297, 150 (2022). https://doi.org/10.1007/s11207-022-02085-3
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DOI: https://doi.org/10.1007/s11207-022-02085-3