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Midad AL-Adab Refereed Quarterly Journal

Midad AL-Adab Refereed Quarterly Journal

Abstract

There are many studies that dealt with the topic of solar radiation in general, but rarely there is a study that dealt with the topic of calculating the transparency of the atmosphere in details , so we dealt with this topic in detail and with some capacity to obtain new and more realistic results that are used in many fields , through using many mathematical models and equations in which the permeability values of the atmosphere were calculated, namely the calculation of the permeability of oxygen gas and carbon dioxide. This research dealt with calculating the permeability values of the atmosphere for gaseous oxygen and carbon dioxide, and calculating the values of direct solar radiation in cloudy weather for Najaf city for the period from (1980-2017), therefore, the research concluded the following: 1-Calculation of the solar irradiance angle and hourly angle, as well as the actual and theoretical brightness hours for the study area. 2-Calculating the optical air mass factor in the study area, since the highest annual registered rate was (4.18). ) 3-Calculation of the permeability value due to oxygen and carbon dioxide in the study area , and the annual rate was about (0.79)% 4-Calculating the values of direct solar radiation in cloudy weather in the study area, as the annual rate registered was around (18.4) MJ / m2 .

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