Abstract
Vertically integrated volume emission rates of the O( 1S) nightglow measured by WINDII, the WIND Imaging Interferometer on UARS, NASA's Upper Atmosphere Research Satellite, over the equator were compared with zenith measurements of the O( 1S) nightglow over Christmas Island measured by a ground-based all-sky imager during the September, 1995, equinox period. The average variation with respect to local time, the migrating tidal signature, was almost identical for the two data sets. On one night, however, the Christmas Island nightglow showed virtually no tidal signature while WINDII showed that just 40 deg to the west the evening maximum was especially pronounced. This longitudinal variability is shown to be the result of the superposition of a planetary scale gravity wave with the diurnal tidal oscillation. The WINDII data also demonstrate modulation by a 5-day wave, with details to be presented in a later study.
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