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Title: Compressive and rarefactive solitary waves in nonthermal two-component plasmas

Abstract

Using a Sagdeev pseudopotential formalism where nonlinear structures are stationary in a comoving frame, large ion-acoustic solitary waves and double layers have been studied in plasmas with positive ions and nonthermal electrons. The velocity range of positive, compressive solitary waves is limited by the ion density reaching infinite compression, whereas negative, rarefactive solitary waves and double layers can exist when the electron nonthermality exceeds a certain minimum. There are even regions of coexistence, the limits of which can be elucidated by considering the properties of the special Sagdeev pseudopotential at the acoustic speed. In particular, when the compositional parameters and Mach numbers admit only compressive or rarefactive solitary structures, these have to be superacoustic, their amplitude vanishing at the acoustic speed. When both compressive and rarefactive modes can occur, one of them is Korteweg-de Vries (KdV)-like, the other having a non-KdV character, with a finite amplitude at the acoustic speed.

Authors:
 [1];  [2]
  1. Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent (Belgium)
  2. School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000 (South Africa)
Publication Date:
OSTI Identifier:
21421253
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 17; Journal Issue: 10; Other Information: DOI: 10.1063/1.3494245; (c) 2010 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION ACOUSTIC WAVES; NONLINEAR PROBLEMS; PLASMA; SOLITONS; ION WAVES; PLASMA WAVES; QUASI PARTICLES

Citation Formats

Verheest, Frank, School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, and Hellberg, Manfred A. Compressive and rarefactive solitary waves in nonthermal two-component plasmas. United States: N. p., 2010. Web. doi:10.1063/1.3494245.
Verheest, Frank, School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, & Hellberg, Manfred A. Compressive and rarefactive solitary waves in nonthermal two-component plasmas. United States. doi:10.1063/1.3494245.
Verheest, Frank, School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, and Hellberg, Manfred A. Fri . "Compressive and rarefactive solitary waves in nonthermal two-component plasmas". United States. doi:10.1063/1.3494245.
@article{osti_21421253,
title = {Compressive and rarefactive solitary waves in nonthermal two-component plasmas},
author = {Verheest, Frank and School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000 and Hellberg, Manfred A},
abstractNote = {Using a Sagdeev pseudopotential formalism where nonlinear structures are stationary in a comoving frame, large ion-acoustic solitary waves and double layers have been studied in plasmas with positive ions and nonthermal electrons. The velocity range of positive, compressive solitary waves is limited by the ion density reaching infinite compression, whereas negative, rarefactive solitary waves and double layers can exist when the electron nonthermality exceeds a certain minimum. There are even regions of coexistence, the limits of which can be elucidated by considering the properties of the special Sagdeev pseudopotential at the acoustic speed. In particular, when the compositional parameters and Mach numbers admit only compressive or rarefactive solitary structures, these have to be superacoustic, their amplitude vanishing at the acoustic speed. When both compressive and rarefactive modes can occur, one of them is Korteweg-de Vries (KdV)-like, the other having a non-KdV character, with a finite amplitude at the acoustic speed.},
doi = {10.1063/1.3494245},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 10,
volume = 17,
place = {United States},
year = {2010},
month = {10}
}