Abstract
Expressions for group and phase velocity are derived for left- and right-hand circularly polarized waves propagating along the static magnetic field of a magnetoplasma composed of electrons, positive ions, and negative ions. It is shown that a small percentage of negative ions can have pronounced effects on the propagation characteristics of the right-hand wave near the negative ion gyrofrequency. In particular, the wave becomes evanescent in a frequency band just above the gyrofrequency, exhibits a ‘nose effect’ below the gyrofrequency, and above the stop band the wave's group velocity is strongly influenced by the negative ions. Some experimental observations consistent with negative ion effects are discussed.
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