The decay of an electromagnetic wave incident on an inhomogeneous plasma into a background electromagnetic and a forward-going ion acoustic wave (stimulated Brillouin scattering) has been examined by various workers in the underdense region of a non-uniform plasma. It is possible to satisfy the matching conditions for this instability near the resonance layer where large electric fields are excited for a wave obliquely incident on the plasma. A calculation based on the fluid equations is presented and growth rates and thresholds for stimulated Brillouin scattering in this resonance region are calculated and compared with those of the parametric decay and oscillating two-stream instabilities.
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Boyd et al. (1977) studied this question.
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