Abstract⎯The lidar observations, performed in Kamchatka during period from October 2007 to December 2010, are used to analyze the behavior of the vertical aerosol structure in the altitude interval of 30-80 km. The data obtained revealed a regular occurrence of the aerosol scattering during winter in the upper strato sphere and mesosphere at altitudes of 60-75 km. The aerosol scattering in these regions becomes apparent in late October and disappears in March-April. During the warm season (from April to October), the lidar sig nals correspond well to Rayleigh molecular scattering.
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