On spontaneous amplification of large-scale perturbations by two-dimensional electron magnetohydrodynamic turbulence

The influence of small-scale turbulence on large-scale perturbations is stu died in the model of 3-D electron magnetohydrodynamics (EMHD), in which the magnetic field has all three components. it is shown that in addition to p ositive turbulent viscosity and an analogue of alpha-effect caused by helic ity of turbulence, which are typical to 3-D EMHD turbulence, such 2-D turbu lence results in turbulent resistivity, which is caused by anisotropy of tu rbulence and can be negative. (C) 1999 Published by Elsevier Science B.V. A ll rights reserved.