Sun photometry and spectral radiometry at wavelengths less than 360 nm

Details Sun photometry and spectral radiometry at wavelengths less than 360 nm Sun photometry and spectral radiometry at wavelengths less than 360 nm

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32..427s&link_type=abstract

Journal of the Atmospheric Sciences, vol. 32, Feb. 1975, p. 427-436. Research supported by the U.S. Department of Transportatio

Astronomy and Astrophysics

Astronomy

2

Aerosols, Astronomical Photometry, Ozone, Radiometers, Solar Instruments, Ultraviolet Photometry, Absorption Spectra, Irradiance, Light Scattering, Optical Thickness, Photographic Measurement, Spectroheliographs, Spectrophotometry

Scientific paper

Experimental and analytical techniques are reported for extending the useful range of solar photometry and spectral radiometry to ultraviolet wavelengths of less than 360 nm. These entail modifications of the Bouguer-Langley method which allow for the spectral structure in the ozone absorption band, the detailed nature of the extraterrestrial solar flux, and round-earth corrections. The present techniques take advantage of photographic measurements of the solar aureole to provide estimates of the scattered-light contributions when the instrumental solid angle exceeds that subtended by the sun. These results are also used in conjunction with absolute irradiance measurements at the ground level made with a single monochromator equipped with a solar blind photomultiplier and a long-wavelength NiSO4 rejection filter. The comparison of observations with calculations based upon the detailed extraterrestrial spectrum of Arvesen (1969) is used to determine the ozone thickness and the aerosol optical depth.

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