Abstract
Ion composition measurements made on board the near polar orbiting satellites INTERCOSMOS 24 and INTERCOSMOS 25 revealed a middle latitude O ++ density enhancement, which is ∼10x larger than seen at lower and higher latitudes. Previous analysis showed that an O ++ density enhancement occurred in the equatorial edge of the light ion trough at the altitude range ∼750–3000 km especially during recovery phases of geomagnetic storms. A time dependent model that includes two main ions and one minor ion has been constructed to study the responsible mechanisms. Results of calculations for a given geomagnetic field line for the first days of the recovery phase when H + ions fluxes are upwards confirm the decisive influence of H + ion fluxes.
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