Abstract
A possibility that the collapse of a long coherent Langmuir wave is suppressed by the effect of acoustic turbulence is shown. The local depression of the plasma density caused by the ponderomotive force of the long coherent Langmuir wave makes the parametric instability possible and leads to the excitation of the turbulent ion acoustic waves and turbulent plasma waves which are trapped in the modulated Langmuir wave. The scattering of the Langmuir wave by the turbulent waves is effective to the stabilization of the modulation instability as the turbulent energy is increased. The condition for the suppression of the collapse is examined.
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