Total Solar Irradiance Observations from the EURECA and ATLAS Experiments

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 CA rrier; 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.