Solar Reflectance The ratio of the reflected solar fNOKIN to the incident solar fNOKIN. Solar Spectrum Radiation originating from the sun, including ultraviolet, visible, and near-infrared radiation. Approximately 99% of solar energy lies between wavelengths of 0.3 to 3.5 micrometers. 1. Ultraviolet (UV) 3% of total energy (responsible for sunburn) 2.
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