Dynamo mechanism: Effects of correlations and viscosities
摘要
We analyze the effects of the background velocity and the initial magnetic field correlations, and viscosities on the turbulent dynamo and the \alpha-effect. We calculate the \alpha-coefficients for arbitrary magnetic and fluid viscosities, background velocity and the initial magnetic field correlations. We explicitly demonstrate that the general features of the initial growth and late-time saturation of the magnetic fields due to the non-linear feedback are qualitatively independent of these correlations. We also examine the hydrodynamic limit of the magnetic field growth in a renormalization group framework and discuss the possibilities of suppression of the dynamo growth below a critical rotation. We demonstrate that for Kolmogorov- (K41) type of spectra the Ekman number M >1/2 for dynamo growth to occur.
引用
@article{arxiv.cond-mat/0402567,
title = {Dynamo mechanism: Effects of correlations and viscosities},
author = {Abhik Basu},
journal= {arXiv preprint arXiv:cond-mat/0402567},
year = {2009}
}
备注
To appear in EPJB (2004)