Nonlinear dynamics of resistive electrostatic drift waves

Søren Bang Korsholm, Poul Michelsen, H.L. Pécseli

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The evolution of weakly nonlinear electrostatic drift waves in an externally imposed strong homogeneous magnetic field is investigated numerically in three spatial dimensions. The analysis is based on a set of coupled, nonlinear equations, which are solved for an initial condition which is perturbed by a small amplitude incoherent wave-field. The initial evolution is exponential, following the growth of perturbations predicted by linear stability theory. The fluctuations saturate at relatively high amplitudes, by forming a pair of magnetic field aligned vortex-like structures of opposite polarity, i.e. a pair of electrostatic convective cells.
    Original languageEnglish
    JournalPhysica Scripta. Topical Issues
    VolumeT82
    Pages (from-to)12-16
    ISSN0281-1847
    DOIs
    Publication statusPublished - 1999

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