ON CALCULATION OF OPTICAL-THICKNESS OF EX TENDED LOW AND MIDDLE CLOUDS USING MEASUREMENTS OF SOLAR-RADIATION IN 3 SOLAR SPECTRUM RANGES ON EARTH SURFACE WITHOUT SNOW COVER

Simple formulae were obtained to calculate optical thickness of extend ed low and middle clouds using measurements of visible, ultraviolet an d integral solar radiation. These formulae can be used for broad varie ty of aerosol optical parameters, water vapor amount, height of clouds , ozone amount and surface albedo without snow cover. Solar radiation measurements have been made during the field experiment in Zvenigorod on September 1992. Optical thicknesses of stratocumulus clouds obtaine d in three spectral intervals show a good agreement with each other.