Historical reconstruction of UV spectral indices

Solar radiation is one of the major natural drivers of Earth climate changes observed from the Maunder minimum. UV radiation in particular plays a major role in the ozone production/destruction processes and is known to affect the circulation patterns. Here we present reconstructions of the FUV-MUV color index and CaII and MgII core-to-wing indeces from 1749-2015, performed with a semi-epirical approach. We also present a reconstruction of the TSI variability. Our results are compared with reconstructions obtained with models employed in climatological studies.