"Fast spectrometer for ground-based observations of OH rotational temperature "

Hidehiko Suzuki, Makoto Taguchi, Yoshikazu Kanai, and Norihide Takeyama

Abstract:
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 nm, from which the OH rotational temperature can be derived with an accuracy of ±1.9 to 2.5 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°S, 39.6°E) in Antarctica are presented.

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