Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..317m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, May 1985, p. 317-320. NASA-supported research.
Physics
20
Energetic Particles, Magnetic Storms, Ring Currents, Current Density, Flux (Rate), Geomagnetism, Helium Atoms, Ions, Magnetic Field Configurations, Plasma Composition, Protons
Scientific paper
The results of measurements for the magnetic-storm period of September 4-7, 1984 from the medium-energy particle analyzer (MEPA) on the CCE spacecraft are presented. It is shown that within L-shells of about 2.5 to 5 in the dusk sector near the equatorial plane, the enhancement factor in the fluxes for the CNO group is greater than that of helium, which is greater than that of protons. The flux ratios of helium and CNO over all ions at the same total energy show considerable increases in the same L-shell ranges. For the particle population measured by MEPA, a local current-density enhancement of about 0.5 nA/sq m is found over the L range of 3.5 to 6 during the magnetic storm. It is found that the total current density is dominated by the pressure-gradient current of the protons.
Keath Edwin P.
Krimigis Stamatios M.
Lui Anthony Tat Yin
McEntire Richard W.
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