Ion cyclotron resonance in a straight magnetic field with a perpendicular gradient in field strength is analyzed using gyrokinetic theory. Propagation of the fast wave perpendicular to the equilibrium field and into the gradient is examined. The inclusion of the variation of the equilibrium magnetic field over an ion Larmor radius results in perpendicular ion cyclotron damping where previous models predict none. The effect of this damping on ion cyclotron heating of plasmas is discussed.
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Lashmore‐Davies et al. (1989) studied this question.
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