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The effect of finite β (particle pressure/magnetic pressure) on the drift-cyclotron instability is investigated. It is shown that for β<[(B2/4πnMc2)+(m/M)]1/4 the instability range is shifted but not reduced, whereas, for β>[(B2/4πnMc2)+(m/M)]1/4 the growth of the drift-cyclotron mode is much reduced.
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Bajaj et al. (1972) studied this question.
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