The Construction of a Long-Term Total Solar Irradiance Record and Its Uncertainties

Authors: S. Dewitte, D. Crommelynck
Affiliation: Royal Meteorological Institute of Belgium

The following 'long term' total solar irradiance measurements are now available: TIM/SORCE since 1993, ACRIM3 since 2000, DIARAD/VIRGO and PMO6/VIRGO since 1996, ACRIM2 from 1991 to 2001, ERBS since 1984, ACRIM1 from 1980 to 1989, and ERB/NIMBUS7 from 1978 to 1994.

In addition 'point' measurements of the SOLCON radiometer on the space shuttle are available in 1992,1993,1994,1998 and 2003.

We investigate how these measurements can be combined into a long-term record of total solar irradiance and what the uncertainty of this record is.