UVB radiometry and its Monte Carlo simulation

At the ENEA (National Agency for New Technology, Energy and the Environment) research centre of Brasimone (Bologna, Italy) a narrowband multifilter radiometer for 4 wavelengths of UVB radiation has been tested and operated; its use for long duration measurements campaigns of ultraviolet flux at ground level is foreseen, operating the separation of direct and diffuse components of the radiation. Experimental results have been compared with those obtained by means of the PREMAR-2 code, which uses the Monte Carlo method to simulate the transport of radiation in the atmosphere. To this aim, data obtained by using the radiance-transmittance LOWTRAN-7 code have been exploited to build up a library data set of the above code. Comparisons between experimental and computational results on a fine meteorological day, for the diffuse/total radiation ratio on the ground, were found to agree