Motivated by plasma and wave measurements in the cusp auroral region, we have investigated electron-acoustic solitons a consisting of fluid ions, cool electron hot Boltzmann component. A recently described method integrating full nonlinear equations as an initial-value problem is used to construct arbitrary amplitude. Using reductive perturbation technique, Korteweg-de Vries equation, which includes effects finite cool-electron ion temperatures, derived, results are compared with theory....

It is shown how existence domains for arbitrary-amplitude ion-acoustic solitons and double layers are determined numerically by cut-off conditions on the corresponding Sagdeev potential. A two-electron-temperature model considered, in positive-ion plasmas given terms of electron parameters, while negative-ion such described parameters characterizing role negative ion species.

Large- and small-amplitude rarefactive ion-acoustic double layers have recently been studied in a fluid plasma with Maxwellian electrons single cold ion species. Here the stationary large-amplitude theory is generalized to include two warm A technique for numerically solving full nonlinear problem presented. With it, useful predictions of effect temperatures light-ion contamination on double-layer structure are made. generalization an arbitrary number similar components pointed out. The...

A recently described numerical theory for obtaining the Sagdeev and real potential profiles of stationary wave forms in a plasma consisting double-Maxwellian electrons two or more species warm ions is used study solitons such plasma. The effects ion temperature light-ion concentration on rarefactive ion-acoustic soliton double-ion obtained with this large-amplitude are compared those predicted from Korteweg–de Vries equation. Application to work Nakamura co-workers discussed, we draw...

Weakly relativistic electron-acoustic solitons are investigated in a two-electron-component plasma whose cool electrons form beam. A general Korteweg-de Vries (KdV) equation is derived, the small-|ø| domain, for consisting of an arbitrary number relativistically streaming fluid components and hot Boltzmann component. This then applied to specific case waves. In addition, fully nonlinear system Poisson equations integrated yield amplitude. It shown that beam effects on significantly increase...

It is well known that ion-acoustic double layers occur in plasmas containing two-temperature electron species and positive ions. In a recent study Verheest suggested such structures can when there only one but both negative ion species. There stationary modified Korteweg de Vries equation was derived to support his deduction. This prediction, however, contradicts our own arbitrary-amplitude studies, which also cover the parameter regime. Here we resolve discrepancy by examining approaches...

The effect of dust charge variation on acoustic solitons is investigated using the full charging equation, with exact expressions for electron and ion currents. Reduction in amplitude soliton profile presence found to be more significant larger grains.

A recent large-amplitude fluid theory of electrostatic ion-acoustic double layers [J. Plasma Phys. 40, 163 (1988)] is shown to be adaptable the case stationary in a two-ion plasma with kinetically determined ions. The influence ion temperature and light-ion concentration on double-layer structure studied directly compared predictions. role trapping parameter examined. It found that departure from can explained as being due Landau damping and/or trapping. Extension multielectron multi-ion...

In a number of calculations involving nonlinear structures such as double layers and solitons, the Korteweg-de Vries theory is applied beyond its range validity or approximations are made which not self-consistent. Some situations arising in fluid multispecies plasmas pointed out attention drawn to arbitrary-amplitude numerical yield results that physically very different from those approximate theories. particular, severe restrictions on occurrence ion-acoustic negative-ion...

The fluid equations for a one-dimensional, unmagnetized and collisionless plasma are numerically integrated in finite domain to obtain sheaths at the absorbing wall system boundaries. type of boundary conditions required formation sustaining long-time evolution is discussed detail. In contrast earlier specialized approaches, this treatment utilizes more general fully non-linear model, incorporating both ion electron dynamics, generate time evolutionary sheaths. particular, we avoid...

Since the satellite observations of auroral double layers by Temerin and others, several small amplitude theories have been proposed to account for these. In a recent such theory [J. Phys. Soc. Jpn. 56 (1987) 139] typical rarefactive supposedly better agreement is obtained employing negative ion plasma models. However, means numerical author we unable obtain in plasma. We therefore re-examine above observed parameter values order explain discrepancy.

Nonlinear density cavities or cavitons occur under various conditions in laboratory and space plasmas. In the past, several kinetic studies, Vlasov–Poisson simulations, particle simulations fluid model have been employed to study such structures. Most, if not all invoked relatively complex mechanisms, usually end result of Langmuir turbulence collapse, counter-streaming beams leading explain formation contrast here, a fully nonlinear electromagnetic one-dimensional is demonstrate that simple...

This article presents a 2-D generalization of the 1-D simulation (J. Phys. Soc. Jpn. vol. 90, 114501, 2021) density cavitons formed in two-fluid plasma induced by Gaussian perturbed perpendicular magnetic field. It is shown that mechanism for caviton formation employed before can also be used to generate corresponding higher-dimensional structures. Here, electron-ion model numerically integrated means finite volume numerical scheme evolve system equations time over several ion periods....

In this study, the fully nonlinear relativistic ideal two-fluid equations are numerically integrated to show how solitary wave pulses can arise from simple initial conditions when electromagnetic waves parallel a constant magnetic field considered in degenerate electron–positron plasma. The formation and propagation of one-dimensional fast solitons slower identified as being related sound mode Alfvén mode, respectively. While similar plasmas have been studied theoretically by many authors,...