Published online by Cambridge University Press: 12 April 2016
The total solar irradiance was observed by Differential Dual Absolute Radiometers (DIARAD) within the SOVA (SOlar VAriablity) experiment during the EURECA-I mission (EUropean REtrievable CArrier; August 1992 – June 1993) and within the SOLCON (SOLar CONstant) experiment during the ATLAS-1 and 2 missions (ATmospheric Laboratory for Applications and Sciences; March 1992 and April 1993). The results from these observations are presented and the metrology aspect addressed through comparison of the simultaneaous measurements with the two DIARADs on EURECA-I and ATLAS-2, respectively.