Acoustic Solitons in Dusty Plasmas Revisited

Abstract

The usual description of dust‐modified ion‐acoustic and dust‐acoustic solitons in plasmas containing negative dust is in terms of Boltzmann distributions for the hotter species. In the dust‐modified ion‐acoustic regime, besides positive potential solitons, negative ones can also be generated, for non‐Boltzmann as well as for Boltzmann electrons, subject to very mild conditions that were previously ignored or given for weakly nonlinear solutions only. In the dust‐acoustic domain in plasmas with negatively charged dust, however, only negative potential solitons can occur, even when the lighter species have non‐Boltzmann distributions.