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  Investigating Global Convective Dynamos with Mean-field Models: Full Spectrum of Turbulent Effects Required

Warnecke, J., Rheinhardt, M., Viviani, M., Gent, F. A., Tuomisto, S., & Käpylä, M. J. (2021). Investigating Global Convective Dynamos with Mean-field Models: Full Spectrum of Turbulent Effects Required. The Astrophysical Journal Letters, 919(2): L13. doi:10.3847/2041-8213/ac1db5.

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 Creators:
Warnecke, Jörn1, Author              
Rheinhardt, Matthias, Author
Viviani, Mariangela1, 2, 3, Author              
Gent, Frederick A., Author
Tuomisto, Simo, Author
Käpylä, Maarit J., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2Max Planck Research Group in Solar and Stellar Magnetic Activity (Mag Activity) – SOLSTAR, Max Planck Institute for Solar System Research, Max Planck Society, ou_2265638              
3IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832290              

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Free keywords: Magnetohydrodynamics; Solar dynamo; Solar cycle; Stellar activity; Stellar magnetic fields
 Abstract: The role of turbulent effects for dynamos in the Sun and stars continues to be debated. Mean-field (MF) theory provides a broadly used framework to connect these effects to fundamental magnetohydrodynamics. While inaccessible observationally, turbulent effects can be directly studied using global convective dynamo (GCD) simulations. We measure the turbulent effects in terms of turbulent transport coefficients, based on the MF framework, from an exemplary GCD simulation using the test-field method. These coefficients are then used as an input into an MF model. We find a good agreement between the MF and GCD solutions, which validates our theoretical approach. This agreement requires all turbulent effects to be included, even those which have been regarded as unimportant so far. Our results suggest that simple dynamo models, as are commonly used in the solar and stellar community, relying on very few, precisely fine-tuned turbulent effects, may not be representative of the full dynamics of dynamos in global convective simulations and astronomical objects.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/ac1db5
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 919 (2) Sequence Number: L13 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215