Growth and decay of sonic discontinuities in non-equilibrium magnetogasdynamics

The phenomenon associated with sonic discontinuities in non-equilibrium magnetogasdynamics has been studied by the use of singular surface theory. The fundamental differential equations for growth and decay of sonic discontinuities have been formulated for general class of relaxing gas applying compatibility conditions for surface of discontinuity in continuum mechanics. This class of equations have been solved completely and for particular case of plane. We have also obtained the critical time at which sonic wave terminates in shock wave.