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Spectroradiometric measurements of the distribution of direct solar radiation at Sunspot, New Mexico (altitude 9,200 feet), in June 1955 are described. Detailed spectral data were obtained within the spectral range of 299 to 535 millimicrons for different air masses. At longer wavelengths radiant-energy evaluations were made only for selected points between the water-absorption bands. From these data, supplemented by other measurements and estimates for radiantenergy intensities for very short and very long wavelengths, a preliminary spectral integration of the total solar intensity yields a solar constant in general agreement with the best published values.

Preliminary spectroradiometric measurements of the solar constant