Revised historical solar irradiance forcing T. Egorova, W. Schmutz, E. Rozanov, A. I. Shapiro, I. Usoskin, J. Beer, R. V. Tagirov and T. Peter A&A, 615 (2018) A85 Published online: 18 July 2018 DOI: 10.1051/0004-6361/201731199