Compute the daily extra-terrestrial radiation at a plane parallel to the earth surface (\(S0\) or \(H0\) depending on the source) following Khorasanizadeh and Mohammadi (2016).
Rad_ext(DOY, Latitude, Gsc = Constants()$Gsc)
| DOY | Ordinal date (integer): day of year from 1st January (day) |
|---|---|
| Latitude | Latitude (deg) |
| Gsc | The solar constant (W m-2), default to |
\(S0\), the daily extra-terrestrial radiation (\(MJ\ m^{-2}\ d^{-1}\))
Khorasanizadeh, H. and K. Mohammadi, Diffuse solar radiation on a horizontal surface: Reviewing and categorizing the empirical models. Renewable and Sustainable Energy Reviews, 2016. 53: p. 338-362.
# Daily extra-terrestrial radiation on january 1st at latitude 35 N : Rad_ext(DOY= 1,Latitude= 35)#> [1] 16.9073