  Kinematic dynamo in incompressible isotropic turbulent flows with high
magnetic Prandtl number is considered. The approach interpreting an arbitrary
magnetic field distribution as a superposition of localized perturbations
(blobs) is proposed. We derive a relation between stochastic properties of a
blob and a stochastically homogenous distribution of magnetic field advected by
the same stochastic flow. This relation allows to investigate the evolution of
a localized blob at late stage when its size exceeds the viscous scale. It is
shown that in 3-dimansional flows, the average magnetic field of the blob
increases exponentially in the inertial range of turbulence, as opposed to the
late-Batchelor stage when it decreases. Our approach reveals the mechanism of
dynamo generation in the inertial range both for blobs and homogenous
contributions. It explains the absence of dynamo in the two-dimensional case
and its efficiency in three dimensions. We propose the way to observe the
mechanism in numerical simulations.
