An ir spectrometer used to obtain atmospheric emission spectra from a rocket at altitudes between 45 km and 200 km in the ICECAP Auroral Measurements Program is described. The instrument continuously scans the 6.75–23.2-µm spectral region at the rate of 2 scans/sec. The spectral resolution of the instrument, which employs a circular-variable interference filter (CVF), ranges from 3% to 4%. The entire optical subsection, silicon-arsenic detector, CVF, Irtran 6 lens, baffle, and removable cold cover are cooled below 10 K in a high-vacuum Dewar system. The noise equivalent spectral radiance (NESR) of the spectrometer at 22 ,µm is better than 1 × 10^-11 (W cm^-2sr^-1µm^-1). The dominant high altitude atmospheric emission features observed on two rocket flights were 9.6-µm O₃ and 15-µm CO₂.

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