ACRIM Composite Total Solar Irradiance Time Series


Author:  Richard C. Willson, Columbia University


            ACRIM composite total solar irradiance (TSI) time series are constructed using an optimum subset of results from a 25-year series of satellite experiments and their overlapping comparisons. A minima-to-minima TSI trend of + 0.04 %/decade is resolved during solar cycles 21 to 23. The ACRIM composites use results from the Nimbus7/ERB, ACRIM 1, 2 and 3 and VIRGO experiments as published by their science teams, without modification.