title: Empirical evaluation of a simple analytical formula for the ultraviolet index.
abstract: This paper focuses on the estimation of the UV Index (UVI) for all sky conditions using a simple analytical parameterization involving three independent variables: the solar zenith angle, the total ozone column and the clearness index. Measurements of the UVI made at Badajoz and Cáceres (Southwestern Spain) from January 2006 to December 2007 are used to estimate optimal fitting parameters for the model formula, while measurements from January to December 2008 are used to show that the formula-based estimations have mean absolute errors lower than 6% and R(2) ca 0.99.
authors.affiliation: Departamento de Física Aplicada, Universidad de Granada, Granada, Spain. mananton@unex.es
authors.forename: Manuel
authors.initials: M
authors.lastname: Antón
authors.forename: Antonio
authors.initials: A
authors.lastname: Serrano
authors.forename: María Luísa
authors.initials: ML
authors.lastname: Cancillo
authors.forename: José Agustín
authors.initials: JA
authors.lastname: García
authors.forename: Sasha
authors.initials: S
authors.lastname: Madronich
mesh_terms: D000465:Algorithms; D006305:Health Status Indicators; D006801:Humans; D013472:Sunlight; D014466:Ultraviolet Rays