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Table 2 Empirical models to calculate solar radiation from sunshine duration

From: Global solar radiation estimation from commonly available meteorological data for Bangladesh

Models Regression equations Source
Linear \(H{/}H_0= a + b (S{/}S_0)\) Angstrom (1924), Prescott (1940)
Quadratic \(H{/}H_0 = a + b (S{/}S_0) + c (S{/}S_0)^2\) Akinoglu and Ecevit (1990)
Third-degree \(H{/}H_0 = a + b (S{/}S_0) + c (S{/}S_0)^2 + d (S{/}S_0)^3\) Ertekin and Yaldiz (2000)
Logarithmic \(H{/}H_0 = a + b \times \log (S{/}S_0)\) Ampratwum and Dorvlo (1990)
Exponential \(H{/}H_0 = a \times \exp [b(S{/}S_0)]\) Almorox and Hontoria (2004)
Power \(H{/}H_0 = a(S{/}S_0)^{\mathrm{b}}\) Sen (2007)