Observations of the ring current composition at L less than 4

Details Observations of the ring current composition at L less than 4 Observations of the ring current composition at L less than 4

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..425l&link_type=abstract

Geophysical Research Letters, vol. 7, June 1980, p. 425-428. Research supported by the Akademiia Nauk SSSR and Swedish Board fo

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Magnetospheric Ion Density, Plasma Composition, Positive Ions, Ring Currents, Satellite Sounding, Hydrogen Ions, Magnetic Storms, Magnetospheric Instability, Oxygen Ions

Scientific paper

Observations showing that the low energy (less than 17 keV) portion of the ring current at L less than 4 is composed mainly of O(+) and He(+) ions during quiet times and the recovery of magnetic storms are presented. The data were obtained from the ion composition experiment on board the Prognoz-7 satellite during several passes through the ring current region. For L less than 3.5, the relative abundance of H(+) was only a few percent of the ion energy density in the energy range of 0.2-17 keV. Although O(+) normally dominates for L less than 4, the relative contribution of He(+) increases with decreasing L, and in one case became more abundant than O(+) for L less than 3. One example of a storm injection shows dominance by O(+) ions (82%) with H(+) only giving a minor contribution (15%) to the density. These observations are consistent with inferences based on charge exchange, H(+) being most rapidly lost and He(+) being the most stable.

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