The mean electro-motive force and current helicity under the influence of rotation, magnetic field and shear

摘要: The mean electromotive force (MEMF) in a rotating stratified magnetohydrodynamical turbulence is studied. Our study based on the mean-field magnetohydrodynamics framework and τ approximation. We compute effects of large-scale magnetic fields (LSMF), global rotation and shear flow different parts MEMF (such as α-effect, turbulent diffusion, transport, etc.) an explicit form. influence helical fluctuations which stem from small-scale dynamo taken into account, well. In article, we derive equation governing current helicity evolution. It shown that joint effect differential media can be responsible for generation, maintenance redistribution helicity. implication obtained results to astrophysical dynamos considered.