Abstract
Abstract From our growing data base of OH and O 2 airglow intensity and temperature measurements at lower mid-latitudes, gravity wave information has been extracted by time series spectral analysis. According to existing theories, the amplitude and phase relationships between intensities and rotational temperatures for a given airglow emission contain information about vertical wave propagation. A wide but clearly non-random distribution of phase shifts between intensity and temperature is observed. Cases of 180°, often cited in the literature, are definitely exceptions, here. For observed periods between about ten minutes and three hours, 30% of the waves at 95 km, and 40% at 87 km propagate downward. This signals the importance of wave reflection in the mesopause region.
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