# 17-26-073

global UV index

quantity developed for the public domain, for weather forecasting and climatology, which quantifies the erythemal potential (or sunburning power) of the ambient solar ultraviolet radiation, but could also be applied to other sources

Note 1 to entry: The International Global UV Index, IUV, is defined by the formula:

where Eλ(λ) is the solar spectral irradiance expressed in W⋅m−2⋅nm−1 at wavelength λ, ser(λ) is the erythema spectral weighting function, and ker is a constant equal to 40 m2⋅W−1.

Note 2 to entry: The global UV index has unit one.

Note 3 to entry: This entry was numbered 17-498 in CIE S 017:2011.

Publication date: 2020-12