Evidence for a zonally trapped diurnal tide in CRISTA temperatures

CRISTA temperature data which was taken from 50 to 90 km on 5 November 1994 are discussed. There appears to be evidence for a highly excited, trapped diurnal tidal wave. At 75 km altitude and near the equator the amplitude reaches it's maximum. The amplitude is not zonally symmetrical, but shows a maximum at 30° E. Preliminary analysis of the temperature data from 9 November 1994 indicate the observed tide being a singular event of a lifetime of about one week.