Renormalization group analysis of the turbulent hydromagnetic dynamo: Effect of anisotropy

作者：

Highlights：

• The mean EMF in rapidly rotating MHD systems was obtained via renormalization.

• In weak rapidly rotating turbulence (linear evolution of fluctuations) the horizontal EMF dominates the vertical one.

• Only in strong turbulence (nonlinear evolution of fluctuations) the vertical and horizontal EMFs can become comparable.

• Hence in strong turbulence the α -effect can fully operate to amplify all the components of the mean magnetic field 〈B〉.

• Section 6 provides estimates of the electromotive force for natural and laboratory systems.

摘要

•The mean EMF in rapidly rotating MHD systems was obtained via renormalization.•In weak rapidly rotating turbulence (linear evolution of fluctuations) the horizontal EMF dominates the vertical one.•Only in strong turbulence (nonlinear evolution of fluctuations) the vertical and horizontal EMFs can become comparable.•Hence in strong turbulence the α -effect can fully operate to amplify all the components of the mean magnetic field 〈B〉.•Section 6 provides estimates of the electromotive force for natural and laboratory systems.

论文关键词：

论文评审过程：Received 27 June 2020, Revised 23 February 2021, Accepted 26 March 2021, Available online 15 April 2021, Version of Record 15 April 2021.

论文官网地址：https://doi.org/10.1016/j.amc.2021.126252