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

A. Esfandyari-Kalejahi, I. Kourakis, M. Akbari-Moghanjoughi

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14 Scopus citations

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 SchröNodinger 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.

Original languageBritish English
Pages (from-to)169-181
Number of pages13
JournalJournal of Plasma Physics
Volume76
Issue number2
DOIs
StatePublished - Apr 2010

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