SCATTERING OF ELECTROMAGNETIC-WAVES BY HYBRID WAVES IN A 2-ELECTRON-TEMPERATURE PLASMA

ln this paper, we use the hydrodynamic approach to study the stimulated scattering of high-frequency electromagnetic waves by a low-frequency electrostatic perturbation that is either an upper- or lower-hybrid wave in a two-electron-temperature plasma. Considering the four-wave interaction between a strong high-frequency pump and the low-frequency electrostatic perturbation (LHW or UHW), we obtain the dispersion relation for the scattered wave, which is then solved to obtain an explicit expression for the growth rate of the coupled modes. For a typical Q-machine plasma, results show that in both cases the growth rate increases with n0h/n0c. This is in contrast with the results of Guha & Asthana (1989), who predicted that, for scattering by a UHW perturbation. the growth rate should decrease with increasing n0h/n0c.