Planetary and Space Science 55 n r

ne 6 A review of recent studies on a new mechanism of generation of large-scale magnetic field in a sheared turbulent plasma is presented. Turbulence with a large-scale velocity shear is a universal feature in astrophysical plasmas. It has been recently =U, where U is the mean velocity. The dynamo instability in a sheared turbulent plasma is related to the W J-term in the mean electromotive force, and it can be (the integral turbulent scale) and K =B =2B deter-mines the inhomogeneity of the mean original magnetic The goal of this communication is to review recent studies on the new mechanism of generation of large-scale magnetic field due to the shear-current effect in a sheared ARTICLE IN PRESSturbulent plasma. The mean-field dynamo instability is saturated by the nonlinear effects. There are two types of the nonlinear effects caused by algebraic and dynamic 0032-0633/ $- see front matter r 2007 Elsevier Ltd. All rights reserved. doi:10.1016/j.pss.2007.05.011 Corresponding author