Theory of modulational interaction of two coupled waves. Part 2. Instability of pump Langmuir waves

Abstract
The modulational instability of two pump Langmuir waves is investigated for the case of comparatively small instability rates, when ‘renormalized’ expressions for linear and nonlinear plasma polarization responses should be used. The rates found are compared with the modulational instability rates for a single monochromatic Langinuir mode.

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