  Fluctuation dynamo action has been obtained for a flow previously used to
model fluid turbulence, where the sensitivity of the magnetic field parameters
to the kinetic energy spectrum can be explored. We apply quantitative
morphology diagnostics, based on the Minkowski functionals, to magnetic fields
produced by the kinematic fluctuation dynamo to show that magnetic structures
are predominantly filamentary rather than sheet-like. Our results suggest that
the thickness, width and length of the structures scale differently with
magnetic Reynolds number.
