Abstract
Occasionally micropulsation dynamic spectra show a series of nosed tones in place of the more usual purely rising tones. These are explained in some detail if, at times, some 3–10 per cent of the ionic content in the outer magnetosphere is helium (H 6 +). Although this is one or two orders of magnitude greater than expected from diffusive equilibrium theory, it is in broad agreement with recent Ogo-A measurements.
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