Abstract
The ring current during the magnetic storm period of September 4-6, 1984 is investigated with the AMPTE/CCE Medium Energy Particle Analyzer. Within the L-shells of ≈2.5 to 5 in the dusk sector (≈ 16 MLT) near the equatorial plane, flux in the lowest energy channel of the carbon, nitrogen, oxygen (CNO) group (137 to 365 keV) shows the largest enhancement factor (2 × 10³), followed by the helium (≈ 10² in the 72 to 240 keV channel) and then by the protons (≈ 10 in the 56 to 190 keV channel). Flux ratios of helium and CNO to all ions at equal total energies also show significant increases in the same L-shell ranges. The radial profile of the current density for the ring current particles sampled is also evaluated, showing current density enhancement of about 0.5 nA/m² over the L range of 3.5 to 6 during the main phase of this magnetic storm. The major contribution to the computed current density is due to the pressure gradient current of the protons.
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