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Selected measurements performed with Multi-Filter Rotating Shadow-band Radiometers under cloudless conditions at an urban tropical site, Sao Paulo, Brazil (23.65 o S, 46.62 o W, 800 m above the mean sea level) are analyzed. Water vapor content (U) values are estimated from the analysis of measurements performed near 940 nm with two bandwidths (10 and 35 nm). Narrow- and wide-band measurements...
Atmospheric turbidity causes attenuation of solar radiation reaching the earth's surface under a cloudless sky. The Ångström turbidity coefficient and the aerosol optical thickness, AOD550, were obtained from 10-minute direct normal solar irradiance measurements recorded in a rural area of Castilla y León region, Spain, from July 2010 to December 2012. During the study period, the diurnal variation...
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