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Table 3 Angstrom–Prescott method for the six cities

From: Evaluation of global solar radiation from meteorological data in the Sahelian zone of Chad

Abeche \(\frac{H}{{H_{0} }} = 0.4476 + 0.2042\left( {\frac{S}{{S_{0} }}} \right)\) Mongo \(\frac{H}{{H_{0} }} = 0.4603 + 0.1766\left( {\frac{S}{{S_{0} }}} \right)\)
Ati \(\frac{H}{{H_{0} }} = 0.4608 + 0.1758\left( {\frac{S}{{S_{0} }}} \right)\) Moussoro \(\frac{H}{{H_{0} }} = 0.4612 + 0.1749\left( {\frac{S}{{S_{0} }}} \right)\)
N’Djamena \(\frac{H}{{H_{0} }} = 0.3660 + 0.3793\left( {\frac{S}{{S_{0} }}} \right)\) Bokoro \(\frac{H}{{H_{0} }} = 0.4602 + 0.1769\left( {\frac{S}{{S_{0} }}} \right)\)