Abstract
Using a two-fluid description, we derive a set of equations describing the nonlinear interaction of a lower hybrid pump wave, propagating almost perpendicularly to the external magnetic field, with low frequency density perturbations associated with a drift wave. In the strongly nonlinear regime, when the system is dominated by convective vector-product-type nonlinearities on the slow time scale, we find a stationary, localized dipole vortex solution driven by the lower hybrid ponderomotive force. These types of vortices can be driven both by a long-wavelength pump, in an oscillating two-stream parametric process, and by the modulation of a short-wavelength pump wave. In most cases, all vortex parameters (amplitude, radius, and velocity) are determined by the amplitude of the pump. \textcopyright{} 1996 The American Physical Society.
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