The Far‐Infrared Limb Observing Spectrometer (FILOS) is an instrument designed to measure the hydroxyl radical (OH) and other chemical species in the upper atmosphere using limb emission in the far‐infrared region of the spectrum. FILOS uses three Fabry‐Perot etalons in series to obtain high spectral resolution near 101 cm−1 and 118 cm−1. The instrument concept, calibration, and atmospheric measurements are discussed.
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Pickett et al. (1993) studied this question.
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