Total Solar Irradiance absolute level from DIARAD/SOVIM, preliminary results

Physics

Scientific paper

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1622 Earth System Modeling (1225), 1640 Remote Sensing (1855), 1650 Solar Variability (7537), 1694 Instruments And Techniques, 3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

The Total Solar Irradiance is the primary source of energy reaching the Earth-atmosphere system. While Its variability has been successfully studied over various time scales, its absolute value remains an open issue. Since 1978 different radiometers have successively and sometimes simultaneously addressed this problem. Current measurements from DIARAD/VIRGO, PMO06/VIRGO and ACRIM3 radiometers agree well together but differ from TIM/SORCE by about 5 W m-2. This difference is higher than the sum of the claimed individual absolute accuracies of the instruments. In this context the SOLAR payload on the International Space Station embarks the SOVIM package. We give the first results of the differential absolute radiometer (DIARAD) inside SOVIM. We discuss its associated uncertainties and present some design modifications to improve the absolute accuracy.

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