Vol. 15, issue 02, article # 11

pdf Mikhalev A. V., Chernigovskaya M. A., Shalin A. Yu. Irregular variations of UV radiation at the ground level. // Atmospheric and oceanic optics. 2002. V. 15. No. 02. P. 166-169.
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The paper presents and analyzes the data on daily observations of ground-level near-noon solar ultraviolet radiation (UVR) in the wavelength range from 295 to 345 nm in Irkutsk (Eastern Siberia, 52°N, 104°E) over a period from 1998 to 2000. The study revealed asymmetry of seasonal variation of the UV radiation with respect to the summer solstice as well as its wavelength dependence in the spectral range under consideration. Irregular variations of the ground-level UV radiation, typical of this region and depending on the season and spectral range selected, are determined. The detected features of the irregular variations are interpreted in terms of the existence of a pronounced annual variation in the total ozone content, the variation (during different seasons) of the proportion between the Rayleigh and aerosol scattering contributions to extinction of UV radiation as well as absorption by ozone and specific climatic weather conditions in Eastern Siberia.