The Effect of Atmospheric Transmittance of UVB Solar Irradiance to Broadband Solar Radiation at Different Climate Sites

International Journal of Applied Physics
© 2022 by SSRG - IJAP Journal
Volume 9 Issue 3
Year of Publication : 2022
Authors : Samy A. Khalil

How to Cite?

Samy A. Khalil, "The Effect of Atmospheric Transmittance of UVB Solar Irradiance to Broadband Solar Radiation at Different Climate Sites," SSRG International Journal of Applied Physics, vol. 9,  no. 3, pp. 1-18, 2022. Crossref,


In the present research, the continuous measurements of global solar radiation (G) and UVB solar radiation are taken in different climate sites during the period time from 1986 to 2020 for all weather conditions. The differences between measured and calculated UVB solar energy values vary from 1% to 2.2%. The average hourly UVB radiation intensity ratio to the current study's total global solar radiation was 0.294%. In contrast, the ratio of UVBext. to the corresponding Gext., UVBext./Gext., was 1.563%, demonstrating the much greater degree of attenuation of UVB relative to global solar radiation. The UVB transmission through the climate can be evaluated during the current investigation, where the typical hourly estimations of UVB transmission are declining due to the air as a daytime component. The change in the monthly average of hourly UVB/G% may be caused by the increase and decrease of both G and UVB's monthly average hourly values. The monthly average mean UVB/G varies from 0.15% in January to 0.30% in June. The average hourly UVB/G% was also lower in the afternoon compared to the morning. The effect of aerosols on the fluctuation in air transparency may have contributed to the lower UVB/G% levels in the afternoon. The average values of UVB solar energy reduction throughout this research were 92.21%, 90%, 90.2%, and 90.1 for Hurghada, El-Kharga, Dammam, and Hail, respectively, in the present study. Inversely, the relationship between UVI levels and solar zenith angle (SZA) at all selected locations. The monthly mean values of RAF under clear skies were equal to 1.058, 1.003, 1.027, and 1.087 for Hurghada, El-Kharga, Dammam, and Hail sites in the present research. The monthly mean values under clear skies, UVB values rise by 1.058%, 1.003%, 1.027%, and 1.087% if the slant ozone value at all examined sites decreases by 1%. Ozone variations at high angles result in non-linear UVB transmission.


Atmospheric transmittance, Solar energy, Solar zenith angle, UVB solar energy.


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