Parametric instability of a lower hybrid wave in a dusty plasma

290-294<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" arial","sans-serif""="">Dust acoustic mode in a magnetized dusty plasma is strongly modified by the presence of a high amptitde lower hybrid wave. The non-linear coupling between the two produces two lower hybrid sidebands. The latter, in conjunction with the pump lower hybrid wave, exerts a ponderomotive force on the electrons, driving the low frequency <span style="font-size:13.0pt;mso-bidi-font-size:6.0pt; font-family:HiddenHorzOCR;mso-hansi-font-family:Arial;mso-bidi-font-family: HiddenHorzOCR">dust-acoutic <span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" arial","sans-serif""="">mode. The variations in the charge of the dust due to electron and ion attachment introduce linear damping in the high frequency modes. At high powers, when the growth rate exceeds the frequency of the dust-acoustic mode, the parametric process goes over to a reactive quasimode decay.