Enhanced ion outflows measured by the DE 1 high altitude plasma instrument in the dayside plasmasphere during the recovery phase

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Scientific paper

Ion flow velocities both parallel and perpendicular to the magnetic field and including the effects of spacecraft charging and spacecraft velocity have been measured during the recovery phase of two large magnetic storms on October 14 and 21 of 1981. These measurements were made both inside and outside the plasmasphere and indicate unreported yet substantial outflows of ions within the dayside plasmasphere (October 14). Combined data from instruments on board the Dynamics Explorer satellite, including the high altitude plasma instrument (HAPI), the energetic ion composition spectrometer (EICS), the retarding ion mass spectrometer (RIMS) and the plasma wave instrument (PWI), indicate that these ions are most likely dominantly O+ at energies at least as low as 5 eV. The nightside pass (October 21), which occurred during the recovery phase of a similar storm, showed no plasmaspheric outflows. the results indicate that a large contribution to the outflux into the dayside plasmasphere during the recovery period is due to E>5 eV ions.

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