INVESTIGATION ON THE SPECTRAL INTENSITY OF ULTRA-VIOLET SKY AND SUN-SKY RADIATION (BETWEEN 297.5 MILLIMICRONS AND 370 MILLIMICRONS) UNDER DIFFERENT CONDITIONS OF CLOUDLESS WEATHER AT 1590 M A.S.L.
PHYSIKALISCH-METEOROLOGISCHES OBSERVATORIUM DAVOS DAVOS-PLATZ (SWITZERLAND)
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The results are presented of extended records of the spectral distribution of ultraviolet solar and sky radiation in the spectral region between 295 millimicrons and 370 millimicrons. The records were obtained with a recording spectrometer consisting of a double monochromator combined with a photomultiplier and a recorder. A diffuser sphere was applied as receiver for the incoming radiation to obtain measurements following the cosine law. Diagrams showing the spectral intensity as a function of wavelength, solar altitude and amount of atmospheric ozone are presented. Up to 330 millimicrons the spectral intensity of ultraviolet sky and global radiation increases rapidly because of diminishing ozone absorption this increase covers between wavelengths of 297.5 millimicrons and 330 millimicrons several orders of magnitude. No considerable change of spectral intensity is observed in the wavelength region between 330 millimicrons and 370 millimicrons. The effect of ozone increase from 0.200 cm to 0.300 cm on the spectral intensity of ultraviolet sky radiation corresponds for 300 millimicrons to a diminuation of intensity by factors varying between 3, 5 and 16, depending on solar altitude. The corresponding variation in the case of global radiation amounts to factors between 8 and 16. Author