Modulational Instability of Two Coupled Waves
Soviet Physics JETP, Vol. 71, No. 4(10), Pp. 715-721 (1990)
Abstract
The modulational interaction of two modes is analyzed in the particular
case of plasma waves. It is shown that this problem can be formulated
rigorously only in certain special cases. The modulational instability
of two coupled waves is distinguished from that of a single wave in
that intereference terms arise even in zeroth order and cause a time
variation of the spectrum. The appearance of the instability threshold
for broad wave spectra is ascribed to interference terms.
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