Because of the possibilities of fluid and electromagnetic force interactions, there is a broader range of possible fluid waves in plasma with applied magnetic fields (Cowling, 1957
; Spitzer, 1962
; Jeffrey, 1966
). By introducing compressibility into the equations, we take a step to allow this coupling to become evident in the analysis. As above, we take the basic set of equations and generally follow the procedures of Boyd and Sanderson (1969)
The set of equations ...