In the present work we have studied changes of mesospheric temperature over the powerful storms Wilma, Haitang, and Katrina using measurements of the space vehicle TIMED. We have found the temperature increasing at the altitude range 80100 km. We have found the explanations for the obtained results by the dissipation of the gravity waves. Propagation of atmospheric gravity waves in a non-isothermal, windless atmosphere, with taking into account the viscosity and the thermal conductivity, has also been modelled in this work. We have determined that the maximum of amplitude of the atmospheric-gravity waves at the considered characteristics corresponds to altitudes of near 90 km (mesopause). It was found that the main factor inuencing propagation and dissipation of the wave in such cases is the vertical temperature gradient. Viscosity and thermal conductivity have less inuence on the wave amplitude.

Variations in the temperature of the upper atmosphere caused by hurricanes are considered in this work on the basis of UARS satellite measurements. Analysis of the temperature variations shows that the tem perature increases by 24-25 K in the mesopause over high power tropospheric formations. Atmospheric gravity waves are considered a possible means of transferring disturbances from the Earth's lower to the upper atmosphere. The maximal amplitude of atmospheric gravity waves was detected at altitudes of about 90 km during numerical simulation of propagation of the waves in a nonisothermal windless atmosphere with an accounting for the viscosity and thermal conductivity. A key factor of their attenuation and propagation is the altitudinal temperature gradient.