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Sustainable Energy Research

Table 2 Value of \(\psi_{i,j}\) according to the number of the month (J) and the climate zone (I)

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

I

J

1

2

3

4

5

6

7

8

9

10

11

12

1

 

1.28

1.38

1.54

1.77

2.05

2.30

2.48

2.41

2.36

1.73

1.38

1.17

2

 

1.46

1.77

2.05

2.15

2.05

2.05

2.10

2.17

2.14

1.96

1.60

1.43

3

 

1.60

1.81

2.00

2.17

2.25

2.26

2.24

2.20

2.10

1.92

1.74

1.60

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