Abstract
Theoretical and observational work indicates that He + and O + ions eventually outnumber protons in the recovery phase ring current, owing to the different loss rates in each case for charge exchange with geocoronal hydrogen. Satellite and ground-based measurements of hydrogen, oxygen, and helium emissions in the resulting equatorial aurora provide a means of monitoring both composition and flux changes, and perhaps would yield some information on the mean ion energy in each case. Observations from Huancayo are discussed.
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