Abstract
An initial study of the behaviour of He + ions in the mid-latitude plasmasphere is carried out by solving the time-dependent equations of continuity and momentum. Starting with a low He + tube content, results are obtained for a period of 8 days. In the topside ionosphere there is an upflow of He + during the day and downflow at night, for the sunspot maximum conditions considered. The downflow at night differs from the behaviour of H + for these atmospheric conditions. However, little of the He + produced in the daytime is lost by recombination at night; it is suggested that the supply of He + to the mid-latitude plasmasphere is, in effect, an escape process for neutral helium.
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