Kinetic theory of the surface waves in a semi-bounded plasma flow

The surface waves spectrum in a semi-bounded plasma flow is studied. The frequency spectra and decrements of damping the waves propagating along the flow are analyzed both in the high-frequency range when spatial dispersion is weak and electrons collisions make the decisive contribution to the waves damping and in the low-frequency range when the effects of spatial dispersion are significant. In particular, the effect of the flow rate on the character of the ion-acoustic waves propagation is studied. Special attention is paid to the problem on the static field penetration into the plasma under the conditions, when the flow rate is higher than the sound velocity