Modulated electrostatic modes in pair plasmas: Modulational stability profile and envelope excitations

Ioannis Kourakis, A. Esfandyari-Kalejahi, M. Mehdipoor, P K Shukla

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

A pair plasma consisting of two types of ions, possessing equal masses and opposite charges, is considered. The nonlinear propagation of modulated electrostatic wave packets is studied by employing a two-fluid plasma model. Considering propagation parallel to the external magnetic field, two distinct electrostatic modes are obtained, namely a quasiacoustic lower moddfe and a Langmuir-like, as optic-type upper one, in agreement with experimental observations and theoretical predictions. Considering small yet weakly nonlinear deviations from equilibrium, and adopting a multiple-scale technique, the basic set of model equations is reduced to a nonlinear Schrodinger equation for the slowly varying electric field perturbation amplitude. The analysis reveals that the lower (acoustic) mode is stable and may propagate in the form of a dark-type envelope soliton (a void) modulating a carrier wave packet, while the upper linear mode is intrinsically unstable, and may favor the formation of bright-type envelope soliton (pulse) modulated wave packets. These results are relevant to recent observations of electrostatic waves in pair-ion (fullerene) plasmas, and also with respect to electron-positron plasma emission in pulsar magnetospheres. (c) 2006 American Institute of Physics.
Original languageEnglish
Article number052117
JournalPhysics of Plasmas
Volume13
Issue number5
DOIs
Publication statusPublished - May 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

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