Analysis Global and Ultraviolet Radiation in Baghdad City, Iraq

Abstract

In present study measurements of global solar radiation and ultraviolet (UVA and UVB) analyzed under different sky conditions. The global solar radiations of Baghdad city during study period highest in the summer are comparatively lower in the winter. The highest daily average solar radiation value of 897 W/m² was measured on June 8, whereas the daily minimum global radiation of 120 W/m² was recorded on December 30. The daily variation of UVA has maximum values in spring and summer days, while minimum values in autumn and winter days. The maximum value found in 13 June was 50.1 W/m², This value refers to a high level of harmful radiation, so it must warn against exposure to the sun at the afternoons during the summer days. The low levels of UVA were found in December, January, February and November. The moderate level of UVA was found in March, April, October and September. The high level of UVA was found in June, July, May and August. UV-B measurement is an indicator of the effect UV radiation on the human skin. The daily variation of UVB has maximum values in spring and summer days, while minimum values in autumn and winter days, where the maximum value found in 21 June was1.65 W/m². Furthermore empirical relationships between global and two component of UV radiation (UVA= 0.043G- 10.13) have correlation coefficients (0.96) and the percentage error (- 0.0179). It was found that there is a good agreement between measured and estimated values of global solar with UVA radiation respectively.

Keywords: Ultraviolet, solar radiation, Atmospheric science, Baghdad, Iraq