what is the difference between Global Solar and total radiation in epw file?

edit

I am working on changing the amount of direct and diffuse solar radiation for my model in epw file. I want to change them in Elements. When I checked I saw three parameters for solar radiation including Normal Solar, Diffuse Solar, and Global Solar. My question is that the Global solar is the total solar? Because I saw the summation of normal and diffuse solar are not equal to the amount of Global Solar in the file. Another question is that by changing the amount of direct and diffuse radiation, Does it have the effect on the amount of outside temperature?