Abstract
Based on the published analysis of the average monthly variations in solar activity and temperature of the upper atmosphere in the region of the mesopause and lower thermosphere (after elimination of the average long-term variations during different 11-year cycles), it was indicated that the periods and amplitudes of the observed quasibiennial variations monotonically decrease in the course of time. The regularity of these variations is described by the Airy function, which represents a wave train with decreasing amplitude and period and reflects cyclic hydrodynamic processes in the Sun’s interior. A spectral analysis of the quasibiennial variations modelly described by the Airy function has been performed. It has been revealed that the period amplitudes near the average value for 2.25 years (27 months) are distributed normally with a dispersion of ∼0.5 years. According to several publications, similar periods are obtained by analyzing measurements of long-term variations in solar activity and parameters of the lower and middle atmosphere. This indicates that the values of the periods are obtained randomly. Therefore, a standard Fourier analysis does not make it possible to determine a real character of the quasibiennial variations since a real physical process is not revealed in the course of this analysis.
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Original Russian Text © N.N. Shefov, A.I. Semenov, 2006, published in Geomagnetizm i Aeronomiya, 2006, Vol. 46, No. 4, pp. 435–441.
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Shefov, N.N., Semenov, A.I. Spectral composition of the cyclic aperiodic (quasibiennial) variations in solar activity and the Earth’s atmosphere. Geomagn. Aeron. 46, 411–416 (2006). https://doi.org/10.1134/S0016793206040013
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DOI: https://doi.org/10.1134/S0016793206040013