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An operational method has been developed to determine the fields of global radiation at the surface and of cloudiness from the imaging data of the geostationary satellite METEOSAT. In this method results of radiative transfer calculations for clear as well as for cloudy atmospheres are combined on a statistical basis with parameters determined from these measurements. This provides a parametrization of actual cloudiness which suffices in accuracy and which is economical enough to be run on a minicomputer. Hourly data of global radiation measured during June 1979 by 19 pyranometers of the Deutscher Wetterdienst (DWD) radiation network have been compared withthe results derived from METEOSAT data of the same period. The RMS difference for single day values of hourly means reaches a maximum of 90 Wm**-RU2 at noon which is approximately 11 % of the corresponding clear sky irradiance. For the monthly mean value of hourly means the RMS difference reduces to 30 Wm**-2 at noon. This difference is not only due to simplifications of the method but also to errors within the pyranometer measurements and local variations of the radiation field.

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Bibliographic Reference: EUR 9481 EN (1984) MF, 51 P., BFR 120, BLOW-UP COPY BFR 255, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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