It is shown that plane ion-acoustic solitons are unstable in magnetized plasmas if the magnetic field is greater than a critical value which roughly corresponds to the condition that the soliton width equals the ion gyroradius. On the other hand, ion-acoustic solitons are stable if their amplitudes exceed a corresponding magnetic-field---dependent threshold. Limitations of previous models are discussed.
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Laedke et al. (1981) studied this question.
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