Direct and total irradiance: Measurement, calculation and comparison with Lowtran 6 and Lowtran 7 predictions

The Lowtran code is used to determine solar transmission, direct solar irradiance and total radiance. In this paper results of comparisons between Lowtran 6 and Lowtran 7, the second including multiple scattering, are presented. These simulations are also compared with measurements of global irradiance carried out with a radiometer UV, in the range (295÷385) nm.