Magnetoclinicity effect in compressible magnetohydrodynamic turbulence

Abstract

Results of analytical statistical evaluation of turbulent correlations in the mean-field compressible magnetohydrodynamic (MHD) turbulence are presented with the analytical and model expressions for the transport coefficients. In addition to the usual solenoidal dynamo expressions, such as the turbulent magnetic diffusivity, the alpha effects, etc., the turbulent electromotive force contains several terms arising from strong compressibility, which are represented by the turbulent dilatation or the density variance. Large-scale instability analysis of the perturbed mean fields is performed. It is shown that, depending on the configuration of the mean magnetic field and the mean density, the magnetoclinicity effect may contribute to the growth of the magnetic perturbation at the largest scale. Applications on the astrophysical flow phenomena are discussed.