Effect of altitude on solar UVR and spectral and spatial variations of UV irradiances measured inWagrain, Austria in winter.

Ultraviolet radiation spectral irradiance was measured at different altitudes on horizontal and tilted planes in different azimuth directions on cloudless days in Austria, in March 2010, within the Impact of Climatic and Environmental factors on Personal Ultraviolet Radiation Exposure project framework. The presented results demonstrate variations of the UVB, UVA and biologically effective spectral irradiance measured on inclined and horizontal surfaces with east, west and south azimuth directions of the vertical surface and the angular position of a detector.