Abstract
The phase and group velocities of electrostatic ion waves in a uniform magnetic field have been studied experimentally, both as a function of propagation angle (θ) with respect to the field, and as a function of wave frequency. For ω ≫ ωci, the ion cyclotron frequency, the phase velocity is found to be identical to the ion acoustic velocity (KTe/M)1/2. For ω ≳ ωci, the electrostatic ion cyclotron mode has been observed. The slow mode (ω < ωci cos θ) has been observed to have a constant phase velocity (KTe/M)1/2 cos θ, in apparent contradiction to theory. The frequency gap (ohgr;ci cos θ < ω < ωci), where waves theoretically do not propagate, has been demonstrated.
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