Transport in two-fluid magnetohydrodynamic turbulence.
We present a theory of transport of magnetic flux and momentum in two fluid three-dimensional reduced magnetohydrodynamic (MHD) turbulence. By including the effects of shear flows and magnetic fields consistently, we show that kinetic Alfven waves can help weaken the quenching in turbulent transport of a strong magnetic field B0 found in single fluid MHD turbulence, leading to turbulent magnetic diffusivity eta(T) proportional (eta/Omega)(1/3)B(0)(-2). Here, eta and Omega are the Ohmic diffusivity and the shearing rate of the shear flow. Momentum transport is diffusive, with the value of eddy viscosity larger than that in single fluid MHD turbulence. The effects of drift waves are found to be weaker. Implications for the instability of shear flows are discussed.
Kim
Eun-jin
EJ
Department of Applied Mathematics, University of Sheffield, Sheffield, S3 7RH, United Kingdom.