File name: TSI_1610-2020_1400.jpg Original Resolution: 1400 × 553 File Size: 118 KB (MIME Type: image/jpeg) Date Published: August 27, 2021 Download file View image caption Total solar irradiance estimated from sunspot observations since 1610. NOAA Climate.gov image, based on the NOAA TSI Climate Data Record (Coddington et al., 2016).