The theory of the fluctuation-driven radial electric field in toroidal
geometry is presented. It is shown that the gyro-viscosity as well as
the poloidal pressure gradient and parallel inertia provide significa
nt contributions to the generation of the radial electric field. The n
eoclassical parallel viscosity modified by the inertia terms and fluct
uation-driven transport is evaluated. The equations for the rotation o
f a turbulent tokamak plasma are derived.