Long-term changes in the activity of wave disturbances in the mesopause region

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Resumo

According to temperature variations obtained on the basis of spectral observations of hydroxyl airglow at the Zvenigorod scientific station of A.M. Obukhov Institute of Atmospheric Physics RAS during 2000−2024, as well as on the basis of statistical analysis methods, long-term trends and dependences on solar activity were obtained for wave disturbances at mesopause altitudes (80−100 km). Using digital frequency filtering, their activities were determined in three regions of wave periods 0.7−2.0, 1.4−4.1 and 2.7−8.2 hours with maxima at 1, 2 and 4 hours. The root-mean-square values of temperature half-differences served as an indicator of wave activity. Both year-round and average seasonal (winter, summer) values were analyzed. As a result, it was established that wave activity has positive trends with their dependence on the frequency band of disturbances (in winter the trend is greater in the high-frequency band, in summer the trend is greater in the low-frequency band). The dependence on solar activity is positive. Its values are greater for the high-frequency band of disturbances, as well as in winter.

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Sobre autores

V. Perminov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Autor responsável pela correspondência
Email: v.perminov@rambler.ru
Rússia, Moscow

N. Pertsev

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: v.perminov@rambler.ru
Rússia, Moscow

V. Semenov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: v.perminov@rambler.ru

academician of the RAS

Rússia, Moscow

P. Dalin

Swedish Institute of Space Physics; Space Research Institute, Russian Academy of Sciences

Email: v.perminov@rambler.ru
Suécia, Kiruna; Moscow, Russian Federation

V. Sukhodoev

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: v.perminov@rambler.ru
Rússia, Moscow

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2. Fig. 1. Long-term course of average annual (a), winter (b) and summer (c) root-mean-square half-differences of temperature OH* relative to temperature. The root-mean-square half-differences determined at Δt = 0.5 h are shown in red, Δt = 1 h – in green and Δt = 2 h – in blue.

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