A nonlinear dispersion relation is derived for the homogeneous, magnetized plasmas by the conventional "ponderomotive force" method. By using this unified dispersion relation, various parametric instabilities (stimulated anomalous absorptions and scatterings) are discussed. The results are compared with those obtained by other authors in detail. In the validity region of this model ωidler《 ωpump), the results derived by previous authors can be recovered. In addition to obtaining a few instabilities which have not been appeared in literature, we also find that in general:1. the "dipole approximation" can give the right results for the stimulated anomalous absorption problems,2. the magnetic field may enhance the plasma stability.
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