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Magnetic fields of low-mass main sequences stars: non-linear dynamo theory and mean-field numerical simulations
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of Negev, Israel.ORCID iD: 0000-0001-7308-4768
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2023 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 526, no 2, p. 1601-1612Article in journal (Refereed) Published
Abstract [en]

Our theoretical and numerical analysis have suggested that for low-mass main sequences stars (of the spectral classes from M5 to G0) rotating much faster than the Sun, the generated large-scale magnetic field is caused by the mean-field alpha(2)Omega dynamo, whereby the alpha(2) dynamo is modified by a weak differential rotation. Even for a weak differential rotation, the behaviour of the magnetic activity is changed drastically from aperiodic regime to non-linear oscillations and appearance of a chaotic behaviour with increase of the differential rotation. Periods of the magnetic cycles decrease with increase of the differential rotation, and they vary from tens to thousand years. This long-term behaviour of the magnetic cycles may be related to the characteristic time of the evolution of the magnetic helicity density of the small-scale field. The performed analysis is based on the mean-field simulations (MFS) of the alpha(2)Omega and alpha(2) dynamos and a developed non-linear theory of alpha(2) dynamo. The applied MFS model was calibrated using turbulent parameters typical for the solar convective zone.

Place, publisher, year, edition, pages
2023. Vol. 526, no 2, p. 1601-1612
Keywords [en]
dynamo, MHD, turbulence, stars: low-mass, stars: magnetic fields
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-223767DOI: 10.1093/mnras/stad2708ISI: 001078226700001Scopus ID: 2-s2.0-85174534990OAI: oai:DiVA.org:su-223767DiVA, id: diva2:1812302
Available from: 2023-11-15 Created: 2023-11-15 Last updated: 2023-11-15Bibliographically approved

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Rogachevskii, Igor

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