The Earths Atmosphere as a Filter

we described the solar resource at the top of the atmosphere. The atmosphere acts as a continuously variable filter for the ETR radiation. The atmosphere has stable components of 78% nitrogen, 21% oxygen, and 1% argon and other noble gases. There are also variable components in the atmosphere, such as water vapor (0% to 2% of the total composition), and gases dumped into the atmosphere by manmade and natural process, such as carbon dioxide, (0.035%), methane, and nitrous oxides.6 

From the discussion above and Figs. 5 to 7, the fluctuations in the solar spectrum at the Earth s surface are dependent on many factors. These variations can be characterized with measurements and models to account for their impact on solar renewable energy technologies. 

4 Utilization of Solar Spectral Regions Spectral Response of Materials 

Why this extended discussion of the solar spectral distribution The primary reason is provided by the example discussing the sensitivity of our eyes, in the previous 

3000K usi and Evening Sunlight Photofloods Photolamps Household 

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