Dynamical Equations and Transport Relationships for a Thermal Plasma

Assuming that the behavior of a plasma can be adequately described in terms of binary collisions, the results can be applied directly to a thermal plasma in a magnetic field. Unfortunately, the relevant equations are extremely complicated, and for this reason their value is somewhat questionable. The equations are presented in summary form, emphasizing the difference between these and those of magnetohydrodynamics. The basis of the general theory for a multicomponent gas mixture is outlined. Dynamical equations of change for a finite number of macroscopic variables are generated and then closed by using a 13-moment approximation for the velocity distribution function. The equations derived in this manner for a binary plasma can be used to generate transport relations by a method of successive approximations. The significance of relaxation and other characteristic times is discussed. The validity of the 13- moment approximation and its relation to other types of approximations are discussed. (B.O.G.)