Fluid theory studies of nonlinear waves in space

The investigations using fluid theory will focus on determining the existence of large and small amplitude solitons in terms of the ranges in speed for which solitons occur and identifying the polarity of the supported solitons. The ranges in soliton speed are limited by the densities of the inertial species becoming complex valued and/or double layers can arise. The studies will entail investigating the soliton existence regions as a function of density, temperature and beam speed (if there are beams) of the plasma constituents in the considered models.