Formation of water aerosols in the upper stratosphere during periods of winter anomaly absorption of radiowaves in ionosphere

The results of lidar observations obtained at the Institute of Atmospheric Optics SB RAS, Tomsk, in January-March, 1996-2000 are presented. The data on the presence of water and its role in stratopause are discussed. It is shown that in usual conditions, determined by the standard atmosphere models, the water content at the altitudes more then 40 km is not enough for the beginning of condensation due to low general atmosphere density. The time correlation between formation of layers with increased aerosol scattering coefficient and increased absorption in lower ionosphere is obtained. It is shown that physical processes, accompanying the phenomenon of anomalous winter absorption of radio wave in lower ionosphere, such as turbulence increase in upper stratosphere and mesosphere, lead to decrease of temperature in stratopause and may lead to increase of water content and water aerosol formation in this zone.