Preliminary spectroradiometric measurements of the solar constant

Spectl'oradiometric measurements of the distribution of direc t solar radiation at Sunspot, New Mexico (altitude 9,200 feet). in June 1955 are d escribed.Detailed spcctral data were obtained within the spectral range of 299 to 535 millimicrons for different air masses.At longer wavelengths radiant-energy evaluations ,rere made only for selectcd points between the water-absorption bands.From these data, supplemented by other measurements and estimates for radiantenergy intensities for very s hort and very long wavelengths, a preliminary spectral integrat ion of the total solar intensity yields a solar constant in general agreement wiLh the best published values.