Abstract
Large-amplitude lower-hybrid wave bursts at ω0>ωLH are excited from a grid and propagate into a density gradient perpendicular to B0. The evolution of the internal rf fields and the plasma parameters is investigated. Above threshold localized field maxima appear (Eint>>Eappl) and, simultaneously, strong density perturbations are formed. The nonlinear phenomena are interpreted by ponderomotive-force and space-charge separation effects.
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