Abstract
For the investigation of radiative properties of clouds using satellite images an objective parameter is required which is independent of conditions of illumination and of recorders. We found a new parameter - the relative brightness - which seems to serve this purpose. Using the relative brightness the daily amount of surface global radiation can be determined easily by linear regression with sufficient accuracy from METEOSAT images. Period between November 1981 and July 1983 was studied and our results are not worse than the ones using more complicated methods.
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