Abstract
Theoretical backgrounds of the active and passive methods for detecting the set of acoustic gravity waves in the upper mesosphere are presented. The observation and processing techniques based on the registration, statistical and spectral analysis of the envelopes of backscatter signals and radio noise are presented. It has been indicated that wave disturbances with periods of 5–120 min were observed during the entire observation period. The average relative amplitude of these disturbances was 2–4%. The dependences of the wave disturbance parameters on the time of day, season, and magnetic activity level have been studied.
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