Solar Irradiance


Data source: For 1976/01/05 to 2003/02/28 Physikalisch Meteorologisches Observatorium Davos, World Radiation Center and for 2003/03/01 to 2020/02/25 University of Colorado Solar Radiation & Climate Experiment. Data are matched using the 2003/03/01 to 2004/02/29 period. (Last modified: 2020/07/01 (The irradiance data terminated on February 25, 2020 but the sunspot data are through June 2020)

Long-Term Sunspot Numbers

Data source:WDC-SILSO, Royal Observatory of Belgium, Brussels Note from SILSO: Since July 1st 2015, the original Sunspot number data are replaced by a new entirely revised data series. On this occasion, the data are presented in a new array of files, containing additional values that were not present in the original series. For proper tracking of those changes, the present version is numbered 2.0. (Data are through June 2020, Last modified: 2020/07/01