Turbulent processes and mean-field dynamo

TL;DR

This paper reviews how turbulence influences mean-field dynamo theory, focusing on solar and galactic magnetic field generation, and discusses deriving turbulence coefficients from local convection simulations.

Contribution

It provides a comprehensive overview of turbulence effects and their incorporation into modern solar dynamo models, highlighting recent methods for deriving transport coefficients.

Findings

Turbulence effects like the alpha effect and turbulent diffusivity are crucial for large-scale magnetic field generation.

Transport coefficients can be derived from local convection simulations and integrated into mean-field models.

The paper emphasizes the importance of turbulence in solar and galactic dynamo processes.

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.