Abstract
Numerical studies on the interaction of electrostatic hydrogen cyclotron (EHC) waves with light ionospheric ions, such as He+, show that when the wave number ratio k⊥/k∥ ⩽ 10 resonant effects are important in the stochastic heating of the ions. When k⊥/k∥ > 10 an appreciable acceleration occurs even though the cyclotron‐resonant effects are absent. As the parallel wave number increases, causing k⊥/k∥ to decrease (< 10), the number of accelerated ions and the perpendicular and parallel energization increase.
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