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We present observations ofthe hydroxyl (6–2) airglow lines from ~ 87 km altitude obtained at Davisstation, Antarctica, in the austral winter of 1999. Nine nights of observationswere made of the P-branch near λ840 nm with a Czerny-Turnerscanning spectrometer (CTS); at the same time, high-resolution Fabry-PerotSpectrometer (FPS) spectra were collected of the Q1(1) doublet atλ834 nm. Rotational temperatures were determined from the CTSobservations, while Doppler temperatures were derived from the line-widths ofthe FPS Q1(1) spectra. Absolute temperatures determined by thesemethods are uncertain by ~ 2 and ~ 20 K, respectively. For the comparison we setthe value of the reflective finesse of the FPS at λ834 nm so themean FPS temperature from one night of simultaneous data was equal to that fromthe CTS, and then looked at the measured variations in each data set for theother eight nights. Both instruments show the upper mesosphere temperature tovary in a similar manner to within the observational errors of the measurements,implying an equivalence of the rotational and Doppler temperatures. We believethat this is the first published simultaneous, same-site, comparison ofrotational and Doppler temperatures from the OH emission. Key words. Atmospheric compositionand structure (airglow and aurora; pressure density and temperature; instrumentsand techniques

Mesospheric temperatures from observations of the hydroxyl (6–2) emission above Davis, Antarctica: A comparison of rotational and Doppler measurements