We determined that the biologically effective solar spectrum remains essentially the same over the times of the day that sunburn may be experienced. The measured spectral irradiance was multiplied wavelength by wavelength by the erythema action spectra. Spectroradiometric measurements were made at ground level over the period of one year (1988-1989) and at different times of the day at latitude 29.5 degrees north. The purpose of the present study was to determine the variation of the biologically effective solar spectrum with the time of the day and the time of the year and to determine the variation of the shortest wavelength that contributes to the sunburn reaction with the time of the day and the time of the year. There have been many measurements of the variation of the solar spectrum with the time of the day and the time of the year, but questions remain as to the variation of the quality of the spectrum and the contribution of the shortest wavelengths of solar terrestrial radiation. In this way we may arrive at the weighted effectiveness of each wavelength of solar radiation to produce a sunburn reaction. Biologically effective solar ultraviolet radiation is defined as the product of the intensity of the solar spectrum and the erythema action spectrum at each wavelength.
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