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Nonlinear modulation of ion-acoustic waves in two-electron-temperature plasmas

Published online by Cambridge University Press:  04 February 2010

A. ESFANDYARI-KALEJAHI ,
I. KOURAKIS  and
M. AKBARI-MOGHANJOUGHI
A. ESFANDYARI-KALEJAHI
Affiliation:
Department of Physics, Faculty of Science, Azarbaijan University of Tarbiat Moallem, 51745-406, Tabriz, Iran (ra-esfandyari@azaruniv.edu)
I. KOURAKIS
Affiliation:
Department of Physics and Astronomy, Centre for Plasma Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK
M. AKBARI-MOGHANJOUGHI
Affiliation:
Department of Physics, Faculty of Science, Azarbaijan University of Tarbiat Moallem, 51745-406, Tabriz, Iran (ra-esfandyari@azaruniv.edu)
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Abstract

The amplitude modulation of ion-acoustic waves is investigated in a plasma consisting of adiabatic warm ions, and two different populations of thermal electrons at different temperatures. The fluid equations are reduced to nonlinear Schrödinger equation by employing a multi-scale perturbation technique. A linear stability analysis for the wave packet amplitude reveals that long wavelengths are always stable, while modulational instability sets in for shorter wavelengths. It is shown that increasing the value of the hot-to-cold electron temperature ratio (μ), for a given value of the hot-to-cold electron density ratio (ν), favors instability. The role of the ion temperature is also discussed. In the limiting case ν = 0 (or ν → ∞), which correspond(s) to an ordinary (single) electron-ion plasma, the results of previous works are recovered.

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Papers
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Journal of Plasma Physics , Volume 76 , Issue 2 , April 2010 , pp. 169 - 181
Copyright
Copyright © Cambridge University Press 2010

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