THE RADIATION CHARACTERISTICS OF THE CLOU DLESS ATMOSPHERE IN MOSCOW AND ZVENIGOROD IN JULY - SEPTEMBER 1992

Results of measurements of the surface integral direct solar radiation by actinometer and of the total solar radiation by piranometer in clo udless condition are discussed in this paper. Experimental data of the total solar radiation Q Wt/m2 are approximated by functions a sin(h)b , where h is the height of the sun. Coefficients a and b are calculate d for transmittance of the atmosphere 0.7; 0.65; 0.6; 0.5. The results were compared with simultaneous measurements in Moscow, model calcula tions and statistical data. The aerosol scattering albedo, characteris tic for cloudless atmosphere of Zvenigorod in summer and autumn 1992 i s evaluated by comparison of our data with model. Properties of cloudl ess atmosphere (the transmittance, the Linke's factor, the optical thi ckness) are evaluated using measurements of the surface integral direc t solar radiation. The comparison with statistical data shows the abno rmally high pollution of the atmosphere. The parameterization of fluxe s of total padiation in the cloudless condition is recommended for con ditions of the Zvenigorod experiment.