A sensitive spectrometer has been developed for observing the hydroxyl airglow in the polar region. This spectrometer is designed to acquire spectra of the Meinel OH 8-4 band, which has the advantage of being relatively free of contamination from auroral emissions. The spectrometer consists of a fast optical system, a transmission plane grating, and a cooled CCD image sensor. The spectrometer can acquire spectra between 900 and $987\mathrm{nm}$ , from which the OH rotational temperature can be derived with an accuracy of $\pm 1.9$ to $2.5\mathrm{K}$ for a $1\min$ exposure. The spectrometer specifications and initial measurement results for the OH rotational temperature and intensity at Syowa Station ( $69.0°\mathrm{S}$ , $39.6°\mathrm{E}$ ) in Antarctica are presented.

© 2009 Optical Society of America

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