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The altitude profiles of temperature fluctuations in the stratosphere andmesosphere observed with the Rayleigh Lidar at Gadanki (13.5° N,79.2° E) on 30 nights during January to March 1999 and 21 nights during Februaryto April 2000 were analysed to bring out the temporal and verticalpropagation characteristics of gravity wave perturbations. The gravity waveperturbations showed periodicities in the 0.5–3-h range and attainedlarge amplitudes (4–5 K) in the mesosphere. The phase propagationcharacteristics of gravity waves with different periods showed upward wavepropagation with a vertical wavelength of 5–7 km. The mean flow accelerationcomputed from the divergence of momentum flux of gravity waves is comparedwith that calculated from monthly values of zonal wind obtained from RH-200rockets flights. Thus, the contribution of gravity waves towardsthe generation of Stratospheric Semi Annual Oscillation (SSAO) is estimated

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Gravity waves observed from the Equatorial Wave Studies (EWS) campaign during 1999 and 2000 and their role in the generation of stratospheric semiannual oscillations