Acoustic Wave Generation and Amplification in a Plasma

Abstract

Acoustic wave generation resulting from the heating of neutral-gas component by the electrons in a weakly ionized plasma is analyzed. It is shown that under certain conditions wave amplification will result, and criteria for amplification and for spontaneous excitation of normal modes are derived. The results are used to explain sound emission in traveling striations in a glow discharge and acoustic modulation of a plasma afterglow. Recently reported experimental observations of acoustical effects in discharges are discussed in the light of the present analysis.