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Table 1 Empirical models to calculate solar radiation from sunshine duration

From: Estimation of solar radiation from cloud cover data of Bangladesh

Models

Regression equations

Source

Linear

\(H/H_0= a + b (S/S_0)\)

Angstrom–Prescott (1924, 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

\(H/H_0 = a + b\cdot \log (S/S_0)\)

Ampratwum and Dorvlo (1990)

Exponential

\(H/H_0 = a\cdot \exp [b\cdot (S/S_0)]\)

Almorox and Hontoria (2004)

Power

\(H/H_0 = a\cdot (S/S_0)^b\)

Sen (2007)