The clearness index is a dimensionless number that represents the fraction of extraterrestrial solar radiation that reaches the Earth's surface. It quantifies the atmospheric effects (clouds, aerosols, etc.) on solar radiation. To calculate the clearness index (Kt) from satellite-derived solar irradiance data, you first need to determine the global horizontal irradiance (GHI) at the site. Satellite-derived GHI data is typically obtained from weather satellites that measure reflected solar radiation and atmospheric conditions. This data is then....
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