## Abstract

Solar, stellar and galactic large-scale magnetic fields are originated due to a combined action of non-uniform (differential) rotation and helical motions of plasma via mean-field dynamos. Usually, non-linear mean-field dynamo theories take into account algebraic and dynamic quenching of alpha effect and algebraic quenching of turbulent magnetic diffusivity. However, the theories of the algebraic quenching do not take into account the effect of modification of the source of turbulence by the growing large-scale magnetic field. This phenomenon is due to the dissipation of the strong large-scale magnetic field resulting in an increase of the total turbulent energy. This effect has been studied using the budget equation for the total turbulent energy (which takes into account the feedback of the generated large-scale magnetic field on the background turbulence) for (i) a forced turbulence, (ii) a shear-produced turbulence, and (iii) a convective turbulence. As the result of this effect, a non-linear dynamo number decreases with increase of the large-scale magnetic field, so that that the mean-field αΩ, α^{2}, and α^{2}Ω dynamo instabilities are always saturated by the strong large-scale magnetic field.

Original language | English |
---|---|

Pages (from-to) | 382-392 |

Number of pages | 11 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 530 |

Issue number | 1 |

DOIs | |

State | Published - 1 May 2024 |

## Keywords

- MHD
- Sun: interior
- activity
- dynamo
- galaxies
- magnetic fields
- turbulence

## ASJC Scopus subject areas

- Astronomy and Astrophysics
- Space and Planetary Science