Estudio experimental de la radiación global ultravioleta en San José, Costa Rica
Fecha
1996
Autores
Wright, Jaime
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Editor
Universidad Nacional (Costa Rica)
Resumen
Se midieron las radiaciones ultravioleta global y solar global en San José, Costa Rica (latitud: 9°56´, longitud: 84°54´, altitud: 1.172m) durante el periodo de octubre 1993 a enero 1995 y se analizaron en función de su variación estacional y de la correlación entre ambas. La dependencia entre la radiación ultravioleta y el índice de claridad del cielo también fue investigada, y se encontró una pobre correlación entre el cociente de la radiación ultravioleta y la radiación solar global (Hv/Hg) y el índice de claridad. El coeficiente de correlación entre Hv/Hg y Hg/Ho no fue mayor de 0,25 para cuatro categorías de tipos de cielos, i.e., cielos cubiertos, cielos despejados, así como dos ámbitos intermedios, lo que demuestra que la radiación ultravioleta no solamente está asociada con la claridad del cielo, sino también con otras condiciones de transmisión atmosférica. Un análisis de regresión entre los valores horarios de las radiaciones ultravioleta y global mostró una relación lineal con un coeficiente de determinación mayor del 98%. Esta regresión simple es confiable para la estimación de la radiación ultravioleta a partir de datos de radiación global.
The ultraviolet global radiation and the global solar radiation at San José, Costa Rica (latitude: 9°56´, longitude: 84°54´, altitude: 1.172m.) during the period October 1993 to January 1995 were analyzed with respect to their seasonal variations and their interdependence. The dependence between the ultraviolet radiation and the clearness index of the skies was also investigated. A poor correlation was found between the quotient of the ultraviolet radiation and the global solar radiation (Hv/Hg) and between the global solar radiations and the extraterrestrial solar radiation (Hg/Ho). The correlation coefficient found between Hv/Hg and Hg/Ho was not greater than 0, 25 for four categories of clearness index; i.e., covered skies, clear skies, and two intermediate conditions. This demonstrates that the ultraviolet radiation is not only associated with the clearness of the skies, but also with other atmospheric transmission conditions. A regression analysis between the hourly values of the ultraviolet and global radiation yielded a linear relationship with a determination coefficient greater than 98%. Thus a simple linear regression is reliable for the estimation of the ultraviolet radiation in San José from global solar radiation data.
The ultraviolet global radiation and the global solar radiation at San José, Costa Rica (latitude: 9°56´, longitude: 84°54´, altitude: 1.172m.) during the period October 1993 to January 1995 were analyzed with respect to their seasonal variations and their interdependence. The dependence between the ultraviolet radiation and the clearness index of the skies was also investigated. A poor correlation was found between the quotient of the ultraviolet radiation and the global solar radiation (Hv/Hg) and between the global solar radiations and the extraterrestrial solar radiation (Hg/Ho). The correlation coefficient found between Hv/Hg and Hg/Ho was not greater than 0, 25 for four categories of clearness index; i.e., covered skies, clear skies, and two intermediate conditions. This demonstrates that the ultraviolet radiation is not only associated with the clearness of the skies, but also with other atmospheric transmission conditions. A regression analysis between the hourly values of the ultraviolet and global radiation yielded a linear relationship with a determination coefficient greater than 98%. Thus a simple linear regression is reliable for the estimation of the ultraviolet radiation in San José from global solar radiation data.
Descripción
Palabras clave
RADIACIÓN, GLOBAL, ULTRAVIOLETA, RADIATION, ULTRAVIOLET