On the night of September 21/22, 1982, ground-based observations were made of an aurora which extended as far equatorward as Logan, Utah (41¿N, 111¿W). An imaging spectrometer was used to obtain spectral images over the wavelength range 3300--5300 ¿ at a spectral resolution of 2.7 ¿. This segment of the spectrum was found to be rich in atomic and molecular features. The vibrational and rotational structures of the molecular nitrogen bands provide extremely valuable information on the velocity of the precipitating particles. From a comparison of the N2+ vibrational and rotational structures, which are strongly populated at the higher levels, and similar data for the N2 bands we conclude that the events indicate strong precipitation of ring current energetic heavy atoms. Because of the absence of observable H&bgr; emission and because of the characteristic energy inferred from the velocity the energetic atoms are probably oxygen.