Observations of the current-driven electrostatic ion cyclotron instability, both at T e /T i =1 and T e /T i >>1, show that as the normalized wave number, k perpendicular to rho i is varied, different modes (m=1, 2, 3...) become successively the most unstable mode. The calculated values of k perpendicular to rho i at which the cross-over from one mode to the next occurs are in reasonable agreement with the observed values provided that the local density gradient is taken into account.
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Alport et al. (1983) studied this question.
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