Spherical UV Irradiance Measurements

The actinic flux (spherical irradiance) is defined as the spectral and diffuse solar radiation, incoming on a sphere. The gauge head is has a special design, so that angular dependence of incident radiation is no longer given. Hence incoming solar radiation is considered equally from all directions, contrary to global irradiance. High-resolution spectral measurements of the actinic UV radiation flux in the wavelength range of 290 to 400 nm are made with a Bentham DM150 spectral radiometer in half-hour intervals in Großenzersdorf since 2007. Contact: S. Simic, D. Rauter