A search for helium ions in the recovery phase of a magnetic storm

Details A search for helium ions in the recovery phase of a magnetic storm A search for helium ions in the recovery phase of a magnetic storm

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2361s&link_type=abstract

Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2361-2366. Research supported by the U.S. Defense Nuclear Agency and

Physics

5

Helium Ions, Magnetic Storms, Red Arcs, Satellite Observation, Auroral Zones, Charge Exchange, Decay Rates, Earth Ionosphere, Earth Magnetosphere, Explorer Satellites, Hydrogen Ions, Mass Spectroscopy, Oxygen Ions, Plasmapause, Ring Currents

Scientific paper

Data from an energetic ion mass spectrometer experiment on the low-latitude polar-orbiting satellite 1971-89A were examined for evidence of helium ions in the region of the ring current during the recovery phase of the December 17-18, 1971 magnetic storm. The principal precipitating ion species with energies between 0.7 and 12 keV were observed to be O+ and H+. No evidence for He+ was obtained. Inferences about the composition of the trapped population are made on the basis of simultaneous observations in the equatorial plane by Explorer 45. Coordinated observations with Explorer 45 and the Fritz Peak Observatory during the period of a stable auroral red arc have provided some information on the ionospheric and magnetospheric processes associated with the arc. A comparison of charge exchange and precipitation lifetimes during the recovery phase of the December 17-18 storm has shown both processes to be of comparable importance as ring current decay mechanisms in the energy range of the observations.

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