Abstract: Methods to estimate the irradiance of ultraviolet-B (UVB; 280?320 nm) radiation are needed to assess biological effects of changes in atmospheric composition. Measurements of the spatial distribution of sky cloud cover, ...

Abstract: Sky radiance measurements in the wavelength bands of ultraviolet-B (0.28?0.32 ?m), ultraviolet-A (0.32?0.40 ?m), and photosynthetically active radiation (0.40?0.70 ?m) were made under obscured overcast skies in a rural ...