Non-linear magnetic diffusivity in mean-field electrodynamics

We consider non-linear transport and drift processes caused by an inhomogen eous magnetic field in a turbulent fluid. The coefficients of magnetic diff usivity and drift velocity are calculated by making use of the second-order correlation approximation. Transport processes in the presence of a suffic iently strong magnetic field become anisotropic with larger diffusion rate and turbulent electrical resistivity across the field than along the field. Non-linear effects also lead to a drift of the magnetic field away from th e regions with a higher magnetic energy.