An experimental study of parametric instability driven by a beam modulation near the lower hybrid frequency is presented. If the modulation voltage exceeds a threshold value, the pump wave appears to decay into an ion acoustic wave and a lower hybrid wave. The threshold electron drift speed is found to be of the order of the ion acoustic speed as predicted by a theory of parametric instability in an inhomogeneous plasma.
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Imai et al. (1975) studied this question.
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