Between 1993 and 2016, BIRA-IASB maintained 6 stations in Belgium for the monitoring of the ground-based solar irradiance, mainly in the UV spectral range.
The proposed data from this network are those obtained with multi-channel filter radiometers (GUV-2511) manufactured by BIOSPHERICAL Inc. The time period is limited to 2011-2015.
It corresponds to measurements of downwelling global solar irradiance at the following wavelengths: 305 nm, 313 nm, 320 nm, 340 nm, 380 nm and 395 nm, as well as Photosynthetically Active Radiation (PAR - 400-700 nm).
A readme file available here describes the format of the data and datafiles.