A new correlation between solar energy radiation and some atmospheric   parameters
  The energy balance for an atmospheric layer near the soil is evaluated. By integrating it over the whole day period a linear relationship between the global daily solar radiation incident on a horizontal surface and the product of the sunshine hours at clear sky with the maximum temperature variation in the day is achieved. The results show a comparable accuracy with some well recognized solar energy models such as the \ang-Prescott one, at least for Mediterranean climatic area. Validation of the result has been performed using old dataset which are almost contemporary and relative to the same sites with the ones used for comparison. 
Antonio Dumas, Andrea Andrisani, Maurizio Bonnici, Mauro Madonia,   Michele Trancossi
physics.ao-ph