The macroscopic magnetohydrodynamics of inhomogeneously turbulent cosmic plasmas
Abstract
Magnetohydrodynamics (MHD) turbulence at high magnetic Reynolds numbers is considered. The mean field magnetohydrodynamic equations for the rather general case of inhomogeneous turbulence are derived using the wellknown Orszag scheme. Special attention is paid to nonlinear effects which are brought about by the back reaction of the magnetic field on the motion. An equation governing the quantity , corresponding to the magnetic gyrotropy of Pouquet et al. (1976) is derived. The diamagnetic effect, that in the nonlinear regime is accompanied by a paramagnetic effect, is considered. The nonlinear transport of largescale field due to density inhomogeneity is discussed. A physical interpretation is presented which clarifies the mechanism of field transport in an inhomogeneously turbulent medium. Some astrophysical applications are discussed.
 Publication:

Geophysical and Astrophysical Fluid Dynamics
 Pub Date:
 1983
 DOI:
 10.1080/03091928308209069
 Bibcode:
 1983GApFD..24..273V
 Keywords:

 Cosmic Plasma;
 Magnetohydrodynamic Turbulence;
 Nonuniform Plasmas;
 Turbulence Effects;
 Astrophysics;
 Dynamo Theory;
 Inhomogeneity;
 Magnetic Fields;
 Plasma Density;
 Astrophysics