Tidal oscillations of the Arctic upper mesosphere and lower thermosphere in winter

摘要: The upper mesosphere and lower thermosphere of the northern polar cap was investigated using Fabry-Perot interferometer measurements horizontal wind velocity in thermosphere, meridian scanning photometer observations atomic oxygen green line brightness Michelson records infrared Meinel OH bands rotational temperature mesosphere. Tidal airglow oscillations absence local solar heating were studied a superposed epoch analysis obtained around three new-Moon intervals (November 9-22, 1993, December 7-20, January 4-17, 1994) Eureka (80°N). harmonics uncovered with an iterated least chi-squared fit, their existence data tested goodness-of-fit probability against null hypothesis no oscillations. No single dominant tide found at all times altitudes winter Arctic thermosphere. exhibited first tide, largest-amplitude shown by diurnal component meridional wave speed. atmospheric layer near mesopause that contributes to emission experienced terdiurnal throughout season. Theoretical polarization relations for evanescent tides, considerations energy density propagation altitude, day-by-day zonal speed indicate observed on November zonally symmetric tide. Other propagating migrating or mixture both.