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Temporal distribution of solar irradiation on a horizontal surface, extra-terrestrial solar irradiance on a horizontal surface, clearness index, and airmass on 2021/09/05. The number of cloud layers determined by sky images is also shown. The clearness index exceeded unity around 14:30 due to a cloud enhancement event. When the extra-terrestrial solar irradiance was <50 W/m2, the clearness index was set to zero.
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