diffuse skylight

diffuse skylight

[də′fyüs ′skī‚līt]
(astrophysics)
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To illuminate a potential effect of the high diffuse fraction of the skin-damaging radiation under a moderately high Sun (SZA approximately 40[degrees]-60[degrees]), one sometimes hears mention of the fact that it is possible to get a sunburn (erythema) even when not exposed to direct sunlight but rather only to the diffuse skylight.
Measurements of the erythemally effective (sun-burning) direct solar beam, diffuse skylight, and total global ultraviolet irradiance are converted to daily ultraviolet index measurements.
Students performing the activities presented in this paper using measurements expressed in UVI terms get an understanding of how the true global UVI varies depending on where the solar disk is located in the sky and the amount of diffuse skylight that is available at the measurement location.
In Figure 4, the direct solar beam, diffuse skylight and global total UV components are plotted.
These systems, designed for diffuse skylight, are intended to increase overall interior daylight levels with less emphasis on the depth of light redirection.

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