This check-box allows the activation of complex solar models. It is active only for 3D simulations. It takes into account shadowing aspects.
Even if simple solar models based upon black body approach are implemented, the authors advise users to prefer weather data files in which direct and diffuse solar flux are generally present and given hour by hour. The name the optional weather file has to be selected in the window "File Names".
This option is still under progress. Several solar radiation models have been implemented by the two authors of SYRTHES, some of them are in the process of being tested soon.