NONLINEAR ALFVEN WAVES IN MAGNETIZED PLASMAS WITH HEAVY IMPURITIES ORDUST

Nonlinear electromagnetic wave propagation in a magnetized plasma with heavy impurities, in particular, dust grains, at frequencies below an d of the order of the ion-cyclotron frequency is considered. The prese nce of immobile dust grains leads to a considerable change of the disp ersion characteristics for Alfven waves propagating along the uniform magnetic field, especially for small wave numbers when two modes with a relatively large frequency gap appear. We discuss the consequences o f this dispersion for the nonlinear properties of the waves.