摘要 : A linear and nonlinear analysis is presented of coupled ion-acoustic and drift waves in a plasma consisting of electrons and ions that is penetrated by a mono-energetic stream of ions of another kind. All the plasma species (elect... 展开 A linear and nonlinear analysis is presented of coupled ion-acoustic and drift waves in a plasma consisting of electrons and ions that is penetrated by a mono-energetic stream of ions of another kind. All the plasma species (electrons and two ion fluids) are allowed to have density gradients in the direction perpendicular to the external magnetic field lines. In the linear domain the standard streaming instability of the acoustic modes and their interaction with drift modes is demonstrated. The threshold values of the stream velocity and the parallel wave number are calculated and discussed. In the nonlinear limit stationary coherent solutions are found which can represent the saturated state of the linearly unstable modes. (C) 2004 Elsevier B.V. All rights reserved. 收起