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Table 2 Regression equations to estimate solar radiation from sunshine duration for Bangladesh

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

#

Annual models

Equations

R 2

1

Linear

\(H/H_0=0.4256 (S/S_0)+ 0.2199\)

0.8888

2

Quad.

\(H/H_0=0.749(S/S_0)^2- 0.3752(S/S_0)+ 0.417\)

0.8920

3

Cubic

\(H/H_0=3.1987(S/S_0)^3- 4.4223(S/S_0)^2+2.3158(S/S_0)- 0.0306\)

0.8899

4

Expo.

\(H/H_0=0.2673\exp [0.9422(S/S_0)]\)

0.8913

5

Log.

\(H/H_0=0.2152\ln (S/S_0) +0.5916\)

0.8729

6

Power

\(H/H_0 = 0.6093(S/S_0)^{0.478}\)

0.8804