The spectrum of an aurora has been obtained at moderately high resolution by using a wide-field interferometer-spectrometer. The free spectral range was from 0.82 to 1.67 &mgr;m at a midrange resolving power of about 1800. The principal auroral features observed during an IBC III+ breakup on the night of April 19, 1974, at Chatanika, Alaska, were the N2+ Meinel bands, the N2 first positive bands, and certain atomic O and N emission lines. Comparisons of the auroral spectra are made with both high-latitude airglow and laboratory spectra taken by the same instrument.