  Small scale turbulent dynamo action in compressible transonic turbulence is
discussed. It is shown that the critical value of the magnetic Reynolds number
displays a bimodal behavior and changes from a typical value of 35 for small
Mach numbers to about 80 for larger Mach numbers. The transition between the
two regimes is relatively sharp. The direct simulations are then compared with
simulations where shocks are captured using a shock viscosity that becomes
large at locations where there are shocks. In the presence of shear it is shown
that large scale dynamo action is possible.
