Using the altitude profiles of temperature fluctuations obtained from Rayleigh Lidar observations at Gadanki
(13.5°N, 79.2°E), India, the characteristics of gravity waves were studied. For this study the temperature profiles on 30
nights during January to March 1999 and 21 nights during February 2000 in the 27-65 km altitude region are used. The
gravity wave perturbations showed periodicities in the 0.5 - 3 hours range and attain large amplitudes ~8 K in the
mesosphere. The phase profiles shows downward propagation indicating the upward wave energy propagation with a
vertical wavelength of 5-7 km. The vertical profile of potential energy per unit mass are computed from the temperature
fluctuations. The observed energy growth is less than the theoretically expected energy growth, which indicates that the
wave is getting damped. The percentage of dissipation of prominent periodicities of gravity waves is calculated at
various height levels. It is observed that gravity waves are dissipated more in mesosphere than in stratosphere. The day
to day variability of prominent periodicities are studied.
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