LATITUDINAL FEATURES OF TROPOSPHERIC RESPONSE TO 27-DAY CYCLIC VARIATIONS OF SOLAR ACTIVITY

• Datum: 2024
• Hauptverfasser: Zakharov, I. G., Chernogor, L. F.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Видавничий дім «Академперіодика» 2024
• Online Zugang: http://rpra-journal.org.ua/index.php/ra/article/view/1455
• Назва журналу: Radio physics and radio astronomy

Subject and Purpose. The troposphere is a natural channel for the propagation of meter- and shorter wavelength radio waves. Studying the impact of solar activity (SA) on the condition of the troposphere is important for improving the accuracy of weather forecasts and understanding the state of the tropospheric radio channel. The present paper has been aimed at identifying and comprehending the solar-tropospheric interactions resulting from the 27-day cycles of solar activity.Methods and Methodology.The study was conducted through twenty 27-day cycles of solar activity, over an interval of latitudes between 0 and 80°N, and at four east longitudes, specifically 30, 180, 240 and 330°E. The atmospheric data used were quoted from the NOAA Physical Sciences Laboratory list (https://psl.noaa.gov  /data/timeseries/daily/) and concerned sea level pressure, temperature in the troposphere at the height level with a 1000 hPa pressure, stratospheric temperature at the height corresponding to 50 hPa, and zonal wind speed.Results. Reliable estimates have been obtained for the atmospheric parameters varying over 27-day cycles, that revealed maximum amplitudes at middle and high latitudes,: in particular the sea level pressure up to 12 hPa, temperature in the  troposphere up to 5.3 K, and up to 3.5 K in the stratosphere . The relative amplitudes (about 1.3%) of these variations correlate with the 27-day changes in the solar UV radiation of a 205 nm wavelength. Anti-phase changes have been observed between the troposphere and stratosphere temperatures over the continents in the Western and Eastern hemispheres, as well as anti-phase changes in pressure over the continentsand the oceans. The change in the sign of temperature variation with height occurs near the tropopause, being accompanied by a ~ 1 km change in the tropopause height. At the latitude of 60°N, the 27-day changes in the zonal wind speed in the stratosphere may reach tens per cent. A persistent solar effect is observable not in winter time alone, but in summer as well, while of a smaller amplitude.Conclusions. Owing to stratosphere-troposphere interaction effects, the troposphere demonstrates a high sensitivity to 27-day variations of the solar UV radiation. The main properties of the 27-day variations of atmospheric parameters testify to the importantrole of planetary and meteorological- scale Rossby waves in the realization of solar influence.Keywords: solar activity; 27-day cycle; stratosphere-troposphere interactionsManuscript submitted  25.03.2024Radio phys. radio astron. 2024, 29(4): 293-307REFERENCES1. Dikty, S., Weber, M., von Savigny, C., Sonkaew, T., Rozanov, A., Burrows, J.P., 2010. Modulations of the 27 day solar rotation signal in stratospheric ozone from Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) (2003—2008). J. Geophys. Res., 115(D1). DOI: https://doi.org/10.1029/2009JD0123792. Fioletov, V.E., 2009. Estimating the 27‐day and 11‐year solar cycle variations in tropical upper stratospheric ozone. J. Geophys. Res., 114(D2). DOI: https://doi.org/10.1029/2008JD0104993. Gruzdev, A.N., Schmidt, H., Brasseur, G.P., 2009. 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