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Horizontal and sun normal spectral biologically effective ultraviolet irradiances

Parisi, Alfio V. & Kimlin, Michael G. (1999) Horizontal and sun normal spectral biologically effective ultraviolet irradiances. Journal of Photochemistry and Photobiology B: Biology, 53(1-3), pp. 70-74.

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Abstract

The dependence of the spectral biologically effective solar UV irradiance on the orientation of the receiver with respect to the sun has been determined for relatively cloud-free days at a sub-tropical Southern Hemisphere latitude for the solar zenith angle range 35-64 degrees. For the UV and biologically effective irradiances, the sun-normal to horizontal ratio for the total UV ranges from 1.18 +/- 0.05 to 1.27 +/- 0.06. The sun-normal to horizontal ratio for biologically effective irradiance is dependent on the relative effectiveness of the relevant action spectrum in the UV-A waveband. In contrast to the total UV, the diffuse UV and diffuse biologically effective irradiances are reduced in a sun-normal compared with a horizontal orientation by a factor ranging from 0.70 +/- 0.05 to 0.76 +/- 0.03.

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ID Code: 8292
Item Type: Journal Article
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author. Author contact details: m.kimlin@qut.edu.au
Keywords: UV, ultraviolet, sun, solar UV irradiance
DOI: 10.1016/S1011-1344(99)00128-1
ISSN: 1011-1344
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1999 Elsevier
Deposited On: 28 Jun 2007
Last Modified: 11 Aug 2011 02:44

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