Abstract
We demonstrate that geomagnetically trapped ion‐cyclotron waves that are generated near the equator with frequencies below ΩHe+, can experience significant O+ cyclotron resonant absorption near the reflection point at frequencies just above the bi‐ion frequency. The absorption is strongest when the wave normal angle is highly oblique and when the heavy ions are relatively hot (T > 1 keV) with a concentration of no more than 1 or 2%. This suggests that wave absorption near the bi‐ion frequency could contribute to the heating process for energetic ring current O+; in the outer radiation zone during geomagnetic storms.
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