Fully nonlinear ion-acoustic solitary waves in a plasma with positive-negative ions and nonthermal electrons

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Sabry, R. and Moslem, W.M. and Shukla, P.K. (2009) Fully nonlinear ion-acoustic solitary waves in a plasma with positive-negative ions and nonthermal electrons. Physics of Plasmas, 16 (3). 032302-1. ISSN 1070-664X (http://dx.doi.org/10.1063/1.3088005)

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Abstract

Properties of fully nonlinear ion-acoustic solitary waves in a plasma with positive-negative ions and nonthermal electrons are investigated. For this purpose, the hydrodynamic equations for the positive-negative ions, nonthermal electron density distribution, and the Poisson equation are used to derive the energy integral equation with a new Sagdeev potential. The latter is analyzed to examine the existence regions of the solitary pulses. It is found that the solitary excitations strongly depend on the mass and density ratios of the positive and negative ions as well as the nonthermal electron parameter. Numerical solution of the energy integral equation clears that both positive and negative potentials exist together. It is found that faster solitary pulses are taller and narrower. Furthermore, increasing the electron nonthermality parameter (negative-to-positive ions density ratio) decreases (increases) the localized excitation amplitude but increases (decreases) the pulse width. The present model is used to investigate the solitary excitations in the (H+,O2−) and (H+,H−) plasmas, where they are presented in the D- and F-regions of the Earth's ionosphere. This investigation should be helpful in understanding the salient features of the fully nonlinear ion-acoustic solitary waves in space and in laboratory plasmas where two distinct groups of ions and non-Boltzmann distributed electrons are present.

  • Item type:Article
    ID code:19216
    Dates:
    Date
    Event
    March 2009
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:14 Jun 2010 15:30
    Last modified:16 Nov 2024 02:17
    URI:https://strathprints.strath.ac.uk/id/eprint/19216
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