Abstract
When plasma embeded in the magnetic field was driven magnetically, Magnetohydrodynamic shock wave was formed. The maximum speed of the front wns 5.6cm/μs. The preheating of the gas is a very important factor to produce this kind of shock wave. The observed data and calculation show that the plasma behind the front is in almost collisior less state. But it seems hardly to say that the observed shock is mainly caused by the collisionless mechanism.
