### Abstract

Language | English |
---|---|

Pages | 032302-1 |

Number of pages | 32301 |

Journal | Physics of Plasmas |

Volume | 16 |

Issue number | 3 |

DOIs | |

Publication status | Published - Mar 2009 |

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### Keywords

- D-region
- electron density
- F-region
- hydrodynamics
- integral equations
- plasma density
- plasma ion acoustic waves
- plasma solitons
- Poisson equation

### Cite this

*Physics of Plasmas*,

*16*(3), 032302-1. https://doi.org/10.1063/1.3088005

}

*Physics of Plasmas*, vol. 16, no. 3, pp. 032302-1. https://doi.org/10.1063/1.3088005

**Fully nonlinear ion-acoustic solitary waves in a plasma with positive-negative ions and nonthermal electrons.** / Sabry, R.; Moslem, W.M.; Shukla, P.K.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Fully nonlinear ion-acoustic solitary waves in a plasma with positive-negative ions and nonthermal electrons

AU - Sabry, R.

AU - Moslem, W.M.

AU - Shukla, P.K.

PY - 2009/3

Y1 - 2009/3

N2 - 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.

AB - 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.

KW - D-region

KW - electron density

KW - F-region

KW - hydrodynamics

KW - integral equations

KW - plasma density

KW - plasma ion acoustic waves

KW - plasma solitons

KW - Poisson equation

UR - http://dx.doi.org/10.1063/1.3088005

U2 - 10.1063/1.3088005

DO - 10.1063/1.3088005

M3 - Article

VL - 16

SP - 32302

EP - 32301

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 3

ER -