A Michelson interferometer spectrometer cooled to 10° by liquid helium was flown into an IBC class III aurora on 1 April 1976 from Poker Flat, Alas. The sensor, HIRIS, covered the spectral range 455–2500 wave numbers (4–22 µm) with a spectral resolution of 1.8 cm^-1 and an NESR of 5 × 10^-12 W/cm² scrm^-1 at 1000 cm^-1. An atmospheric emission spectrum was obtained every 0.7 sec over an altitude range of 70–125 km. Atmospheric spectra were obtained of CO₂ (ν₃), NO (Δν = 1), O₃ (ν₃) and CO₂ (ν₂). Auroral produced excitations were observed for each band, this being the first known measurement of auroral enhancements of O₃ (ν₃), 9.6 µm, and CO₂ (ν₂), 15 µm, emissions.

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