|Data collected at 5:20:03 AM   Thursday 29-Feb-24 (UTC - 0800)
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The blue "Maximum Irradiance" curve is the solar radiation expected at this location on this date with a clear sky. It is the amount of solar radiation hitting this location measured above the atmosphere minus the expected losses through the atmosphere. The blue-green "Typical Irradiance" curve uses the monthly clearness index for Eugene to produce the amount of solar radiation expected on this date. Extraterrestrial solar radiation is calculated using solpos.c which is distributed by the National Renewable Energy Laboratory.
For more on irradiance go to the UO Solar Radiation Monitoring Laboratory.