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Turbulent processes and mean-field dynamo

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arxiv 2303.12425 v5 pith:2AWLIQPU submitted 2023-03-22 astro-ph.SR

classification astro-ph.SR
keywords mean-fielddynamosolarturbulentconvectiondiscusseffectsmagnetic
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abstract

Mean-field dynamo theory has important applications in solar physics and galactic magnetism. We discuss some of the many turbulence effects relevant to the generation of large-scale magnetic fields in the solar convection zone. The mean-field description is then used to illustrate the physics of the $\alpha$ effect, turbulent pumping, turbulent magnetic diffusivity, and other effects on a modern solar dynamo model. We also discuss how turbulence transport coefficients are derived from local simulations of convection and then used in mean-field models.

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  1. Connecting mean-field theory with dynamo simulations

    astro-ph.SR 2025-07 unverdicted novelty 1.0 of 10

    Mean-field dynamo models reproduce the large-scale magnetic modes of 3D simulations at least qualitatively, but quantitative closure remains incomplete because transport coefficients are hard to measure and non-locali...

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