The stability of a plasma consisting of two, unequal, isotropic, ion beams streaming along a uniform magnetic field has been investigated by numerically solving the full electromagnetic, Vlasov, linear dispersion relation for high-$beta$ plasmas. Three instabilities are found: One is closely associated with the usual Alfven mode and the two others with the ''fast'' or magnetosonic mode. The importance of these instabilities for certain neutral- beam-injection experiments and in the solar wind is emphasized.
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Montgomery et al. (1975) studied this question.