Before revision:  Here we show that the evolution and strength of the recent\perc  SARS-Cov-2 pandemics, might have been modulated by the intensity of UV-B/A Solar radiation hitting different regions of Earthduring the diffusion of the outbreak .
After revision:  Here we combine our measurements of the action spectrum of Covid-19 in response to UV light, Solar irradiation measurements on Earth during the SARS-CoV-2 pandemics, worldwide recorded Covid-19 mortality data and our 'Solar-Pump' diffusive model of epidemics to show that (a) UV-B/A photons have a powerful virucidal effect on the single-stranded RNA virus Covid-19 and that (b) the Solar radiation that reaches temperate regions of the Earth at noon during summers, is sufficient to inactivate 63\perc SARS-Cov-2 pandemics, might have been modulated by the intensity of UV-B/A Solar radiation hitting different regions of Earthduring the diffusion of the outbreak .