The thesis is a study of outdoor ultraviolet (UV) radiation as a part of solar radiation – its spectral and temporal variability, doses, as well as dependence on solar elevation, cloudiness, column ozone and aerosols. All conclusions are sitespecific, based on measurements carried out at Tõravere, Estonia, since 2004. Special attention is paid to the influence of cloudiness as the main factor modifying solar radiation, including the UV region.
Clear sky, totally cloudy and broken cloudiness conditions are intercompared as well as different cloud types. UV doses in overcast days are about 1/3 from the clear weather ones and cloudiness showed wavelength dependence with more radiation passing the clouds at the shorter end of UVA than at the longer end – cloud modification factor in case of overcast sky at 332 nm is 0.38 and at 386 nm 0.36, respectively.
Aun, M., 2017. Dependence of UV radiation on climate factors. Reconstruction of UV doses in Estonia for past years (Doctoral dissertation).
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Categories: Solar & Photovoltaics