THE COLLISIONLESS RESONANT INTERACTION AND PSEUDOWAVES

The collisionless resonant interaction is regarded as an interaction b etween the waves corresponding to the collective degrees of freedom (s elf-consistent oscillations) and individual degrees of freedom (pseudo waves). The effect of the various factors that restrict the interactio n intensity (such as collisions, nonlinear processes, an increase in t he oscillation amplitude, and plasma inhomogeneity) on both the pseudo waves and the resonant interaction is discussed. Special attention is paid to collisions: taking them into account leads to a correct descri ption of neutral and damping oscillations in a homogeneous plasma. The effects that are typical of a resonant interaction in an inhomogeneou s plasma are analyzed.