Glower and McCulloch model

Glover and McCulloch included the latitude effects with the aim to improve the sunshine-based model and produced the correlation which can be applied for latitudes less than 60 degrees.

Solar energyGlobal solar radiation model



Initial contribute: 2021-09-06


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Application-focused categoriesIntegrated-perspectiveGlobal scale
Application-focused categoriesIntegrated-perspectiveRegional scale

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The variation with latitude of the regression parameters a and b in the conventional equation of Angström type

\( Q/QA = a + bn/N \)

between total solar radiation on a horizontal surface (Q) and hours of bright sunshine (n) has been examined. It has been shown that the slope of the relationship b is effectively constant, while the threshold value a is a function of latitude. An empirical relationship leading to the Angstrom equation at each latitud \( 𝜑 \)  over the range 0° - 60° is derived and is shown to give values in reasonable accord with previous experience. It is

\( Q/QA = 0.29 cos 𝜑 + 0.52 n/N \)

Quoted from: J  Glover,  Mcculloch J . The empirical relation between solar radiation and hours of sunshine[J]. Quarterly Journal of the Royal Meteorological Society, 1958, 84(360):172-175.




J. GLOVER , J. S. G. McCULLOCH (2021). Glower and McCulloch model, Model Item, OpenGMS,


Initial contribute : 2021-09-06



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