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.