  Plasma density gradients are known to drive magnetic shocks in
electron-magnetohydrodynamics (EMHD). Previous slab modeling has been extended
to cylindrical modeling of radially imploding shocks. The main new effect of
the cylindrical geometry is found to be a radial dependence in the speed of
shock propagation. This is shown here analytically and in numerical
simulations. Ion acceleration by the magnetic shock is shown to possibly become
substantial, especially in the peaked structures that develop in the shock
because of electron inertia.
