الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The propagation and collision of ion acoustic solitons (IASs) in a multicomponent plasma with superthermal electrons are theoretically investigated, for different geometrical configurations, by employing the extended Poincaré–Lighthill– Kuo extended PLK method. For the generic case, the dynamics and collisions of IASs are studied via the Korteweg-de Vries (KdV) equations and the phase shift equations. It is found that both positive and negative polarity IASs can propagate and collide, leading usually to a time delay in propagation occurring during the collision, as compared to a single ion acoustic soliton (IAS) without collisions in the same physical model. Moreover, at a critical value of the negative ion-to-positive ion concentration, modified Korteweg-de Vries (mKdV) equations and their corresponding phase shifts has been derived. In general, it is observed that the trajectories of IASs after collisions are significantly modified due to negative ion-to-positive ion density ratio, negative ion-to-positive ion mass ratio, the superthermal electron parameter, and the positions of IASs.
Also, our investigation is extended to study the oblique collision of IASs in magnetized two-ion plasmas with superthermal electrons. Employing the extended PLK method, the Korteweg–de Vries(KdV) equations and the change in trajectories (i.e., phase shifts) are obtained after the oblique collision. The effects of several physical parameters such as the V angle of collision, the ratio of positive to negative ions concentration and the superthermality of electrons on the trajectories of three-dimensional IASs after the interaction are discussed.
The obtained results give rise important highlights on the interaction of IASs in astrophysical environments such as the Earth, Ionosphere, which contains positive and negative ions with superthermal electrons.