MAGNETOSONIC SURFACE-WAVES IN THE PRESENCE OF ANISOTROPY OF PLASMA TEMPERATURE .1. PROPAGATION ALONG THE MAGNETIC-FIELD

By using the Chew-Goldberger-Low approximation, which allows for tempe rature anisotropy typical of a strongly magnetized collisionless plasm a, the propagation of surface waves at the plane interface between two plasmas with different parameters is investigated. The longitudinal, with respect the magnetic field, propagation of these waves is discuss ed for two cases: at the interface between a magnetized and nonmagneti zed plasma and at the interface between two magnetized plasmas. It is shown that the relationship between the longitudinal and transverse so und velocities (which differ due to anisotropy) and the Alfven velocit ies determines the conditions when fast and slow surface magnetosonic waves can exist. Relationships between these parameters are possible, such that either waves of one type can exist or no such waves exist. A nisotropy of the plasma temperature can lead to the appearance of surf ace waves in those cases when they are absent in an isotropic plasma. In any case, these waves are nondispersive, and their phase velocity l ies between the two characteristic values determined by the Alfven vel ocities and by the anisotropy of sound velocities.