Experimental and theoretical studies of a new type of parametric instability involving the excitation of ion quasimodes (due to nonlinear wave-particle scattering) have been carried out when the "pump" frequency is near the lower hybrid frequency. Plasma heating associated with this instability has also been measured.

• Received 14 February 1974

DOI:https://doi.org/10.1103/PhysRevLett.32.1227