Dynamics of nonlinearly coupled magnetic-field-aligned electromagnetic electron-cyclotron waves near the zero-group-dispersion point in magnetized plasmas

Yannis Kourakis, P K Shukla, G.E. Morfill

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The nonlinear coupling between two magnetic-field-aligned electromagnetic electron-cyclotron (EMEC) waves in plasmas is considered. Evaluating the ponderomotive coupling between the EMEC waves and quasistationary plasma density perturbations, a pair of coupled nonlinear Schrodinger equations (CNLSEs) is obtained. The CNLSEs are then used to investigate the occurrence of modulational instability in magnetized plasmas. Waves in the vicinity of the zero-group-dispersion point are considered, so that the group dispersion terms may either bear the same or different signs. It is found that a stable EMEC wave can be destabilized due to its nonlinear interactions with an unstable one, while a pair of unstable EMEC waves yields an increased instability growth rate. Individually stable waves remain stable while interacting with one another. Stationary nonlinear solutions of the coupled equations are presented. The relevance of our investigation to nonlinear phenomena in space plasmas is discussed. (c) 2005 American Institute of Physics.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalPhysics of Plasmas
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

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