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On the left is a kind of shock phase-space diagram. It shows velocity versus magnetic field orientation with respect to the shock normal. The three unchanging solid lines are the mhd wave speeds—fast, intermediate and slow—calculated with preshock density, pressure and magnetic field strength. The three changing dashed lines are the wave speeds calculated with postshock density, pressure and magnetic field strength.

A shock is represented by an arrow from an open circle (preshock B orientation, shock velocity) to a closed circle (postshock B orientation,postshock fluid velocity in shock direction).

On the right shows the magnetic field vectors (top) and velocity vectors (bottom) as they are in the pre and postshock gas. I get the postshock values from the jump conditions. There's no shock models being run, just input/output values.