Abstract
Spectral observations of the mesopause airglow at the Zvenigorod Scientific Station have been used to obtain the midnight emission intensities of molecular oxygen (О2А(0-1) band) and hydroxyl (OH (6-2) band) for 2000–2019. Spectral analysis of the variations has made it possible to determine the annual variability for each emission, which is described by the sum of four harmonics. The time lag in seasonal variations of the hydroxyl emission relative to variations in the emission of molecular oxygen is 5–18 days. Long-term changes in the average annual emission intensities have been studied. The linear trend (–3.3 ± 0.3% per year for О2А(0-1) and –2.6 ± 0.2% per year for ОН(6-2)), the dependences on the 11-year solar cycle (response to changes in the Lyman-alpha solar radiation (18.5 ± 3.3% per 1011 photons cm–2 s–1 for О2А(0-1) and 10.5 ± 2.5% per 1011 photons cm–2 s–1 for OH (6-2)) and the 22-year solar cycle (response to changes in the solar magnetic field strength (23.2 ± 4.5% per 100 μТ for О2А(0-1) and 12.1 ± 3.5% per 100 μТ for ОН (6-2)), as well as quasi-eight-year oscillations have been found.
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This study was supported by the Russian Foundation for Basic Research, project no. 19-05-00358a.
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Translated by V. Arutyunyan
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Perminov, V.I., Pertsev, N.N., Dalin, P.A. et al. Seasonal and Long-Term Changes in the Intensity of O2(b1Σ) and OH(X2Π) Airglow in the Mesopause Region. Geomagn. Aeron. 61, 589–599 (2021). https://doi.org/10.1134/S0016793221040113
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DOI: https://doi.org/10.1134/S0016793221040113