NONLINEAR MODULATION OF STRONG ELECTROMAGNETIC-WAVES IN WEAKLY INHOMOGENEOUS PLASMAS

The possibility of nonlinear capture of a Langmuir wave into the regio n of weak inhomogeneity under parametric interaction with a strong ele ctromagnetic wave is shown. Under overcritical conditions in the prese nce of dissipation, spatio-temporal amplitude correlations occur and t hen, wave soliton structures are formed. In such a system, powerful re gular oscillations appear. This leads to giant modulation of the pump pulse. Under further increasing of overcriticity, the influence of Lan gmuir instability becomes more essential, and, as a result, solitary w aves become sharply amplified and compressed.