Abstract. We describe a new technique for estimating the vertical fluxes of horizontal momentum in the mesopause region using airglow imager data. The azimuthal distribution of the relative airglow intensity or rotational temperature variance associated with both monochromatic and quasi-random waves is computed from the unambiguous twodimensional horizontal wave number spectrum. The variance distribution is used in a gravity wave model to predict the cross-correlation coefficient between the vertical and horizontal wind perturbations (and hence the momentum flux) as a function of azimuth angle. The technique is applied to OH imager data collected during five nights in

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