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Title: Oblique modulation of electrostatic modes and envelope excitations in pair-ion and electron-positron plasmas

Abstract

The nonlinear amplitude modulation of electrostatic waves propagating in a collisionless two-component plasma consisting of negative and positive species of equal mass and absolute charge is investigated. Pair-ion (e.g., fullerene) and electron-positron (e-p) plasmas (neglecting recombination) are covered by this description. Amplitude perturbation oblique to the direction of propagation of the wave has been considered. Two distinct linear electrostatic modes exist, namely an acoustic lower mode and Langmuir-type optic-type upper one. The behavior of each of these modes is examined from the modulational stability point of view. The stability criteria are investigated, depending on the electrostatic carrier wave number, the angle {theta} between the modulation and propagation directions, and the positron-to-electron temperature ratio {sigma}. The analysis shows that modulated electrostatic wavepackets associated to the lower (acoustic) mode are unstable, for small values of carrier wave number k (i.e., for large wavelength {lambda}) and for finite (small) values of the angle {theta} (yet stable for higher {theta}), while those related to the upper (optic-like) mode are stable for large values of the angle {theta} only, in the same limit, yet nearly for all values of {sigma}. These results are of relevance in astrophysical contexts (e.g., in pulsar environments), where e-p plasmasmore » are encountered, or in pair fullerene-ion plasmas, in laboratory.« less

Authors:
; ;  [1];  [2];  [3]
  1. Azarbaijan University of Tarbiat Moallem, Faculty of Science, Department of Physics, 51745-406, Tabriz (Iran, Islamic Republic of)
  2. (Germany) and Universiteit Gent, Sterrenkundig Observatorium, Krijgslaan 281, B-9000 Gent (Belgium)
  3. (Germany)
Publication Date:
OSTI Identifier:
20860434
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 12; Other Information: DOI: 10.1063/1.2405328; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; DISTURBANCES; ELECTRON TEMPERATURE; ELECTRONS; EXCITATION; FULLERENES; ION ACOUSTIC WAVES; ION TEMPERATURE; IONS; MODULATION; NONLINEAR PROBLEMS; PLASMA; PLASMA INSTABILITY; POSITRONS; PULSARS; RADIATION TRANSPORT; STABILITY; WAVE PACKETS

Citation Formats

Esfandyari-Kalejahi, A., Kourakis, I., Shukla, P. K., Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum, and Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum. Oblique modulation of electrostatic modes and envelope excitations in pair-ion and electron-positron plasmas. United States: N. p., 2006. Web. doi:10.1063/1.2405328.
Esfandyari-Kalejahi, A., Kourakis, I., Shukla, P. K., Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum, & Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum. Oblique modulation of electrostatic modes and envelope excitations in pair-ion and electron-positron plasmas. United States. doi:10.1063/1.2405328.
Esfandyari-Kalejahi, A., Kourakis, I., Shukla, P. K., Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum, and Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum. Fri . "Oblique modulation of electrostatic modes and envelope excitations in pair-ion and electron-positron plasmas". United States. doi:10.1063/1.2405328.
@article{osti_20860434,
title = {Oblique modulation of electrostatic modes and envelope excitations in pair-ion and electron-positron plasmas},
author = {Esfandyari-Kalejahi, A. and Kourakis, I. and Shukla, P. K. and Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum and Ruhr-Universitaet Bochum, Fakultaet fuer Physik und Astronomie, Institut fuer Theoretische Physik IV, D-44780 Bochum},
abstractNote = {The nonlinear amplitude modulation of electrostatic waves propagating in a collisionless two-component plasma consisting of negative and positive species of equal mass and absolute charge is investigated. Pair-ion (e.g., fullerene) and electron-positron (e-p) plasmas (neglecting recombination) are covered by this description. Amplitude perturbation oblique to the direction of propagation of the wave has been considered. Two distinct linear electrostatic modes exist, namely an acoustic lower mode and Langmuir-type optic-type upper one. The behavior of each of these modes is examined from the modulational stability point of view. The stability criteria are investigated, depending on the electrostatic carrier wave number, the angle {theta} between the modulation and propagation directions, and the positron-to-electron temperature ratio {sigma}. The analysis shows that modulated electrostatic wavepackets associated to the lower (acoustic) mode are unstable, for small values of carrier wave number k (i.e., for large wavelength {lambda}) and for finite (small) values of the angle {theta} (yet stable for higher {theta}), while those related to the upper (optic-like) mode are stable for large values of the angle {theta} only, in the same limit, yet nearly for all values of {sigma}. These results are of relevance in astrophysical contexts (e.g., in pulsar environments), where e-p plasmas are encountered, or in pair fullerene-ion plasmas, in laboratory.},
doi = {10.1063/1.2405328},
journal = {Physics of Plasmas},
number = 12,
volume = 13,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}