| Summary: | The surface radiatives fluxes of the Ocean and Sea Ice Satellite Application Facility (OSI SAF) consist of two terms: Surface Solar Irradiance (SSI) and Downward Longwave Irradiance (DLI). They are derived from GOES-12 and MSG-1 data at low and mid latitudes and from NOAA-17 data at high latitudes. The products and methods are briefly described. The results over the year 2004, validation against in situ measurements, GOES/MSG and NOAA/MSG comparisons, are presented and analyzed. The SSI and DLI r.m.s. errors significantly differ at hourly resolution, about 70 Wm-2 and 20 Wm-2 respectively, and are nearly the same, 15 Wm-2 at daily resolution. The GOES and MSG results are fully consistent, while the NOAA and MSG results show higher values of the r.m.s. difference. The SSI algorithm coefficients have been revisited in 2005 and the first results obtained in March 2005 are promising.
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