Abstract
Abstract The annual oscillations (AO) and semi-annual oscillations (SAO) of the monthly mean zonal and meridional winds in the troposphere, stratosphere and mesosphere have been studied using simultaneous data from balloonsondes, rocketsondes and Meteor Wind Radar (MWR) acquired at Trivandrum. A study is also made of the AO and SAO of the diurnal, semi-diurnal and ter-diurnal wind oscillations in the 80–102 km altitudes using MWR observations. The same observations have been used to study the altitude profiles of the annual mean winds, and the annual mean tidal winds. It is found that the AO phase in the NS wind leads with increasing altitude in the stratosphere and mesosphere while SAO phase lags with altitude. The SAO of EW tidal wind amplitudes are slightly stronger than AO. For the NS wind, the AO of the diurnal tide has the largest amplitude and the SAO of the semi-diurnal tide also has a relatively large amplitude. The results are compared with earlier reports from other low latitude stations and with the CIRA 1986 model for 8.5 °N latitude. Further, they are discussed in the light of tidal dissipation in and above the mesopause ( > 70 km).
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