What is Diffuse Horizontal Irradiance?
Diffuse Horizontal Irradiance is the amount of radiation received per unit area by a surface (not subject to any shade or shadow) that does not arrive on a direct path from the sun, but has been scattered by molecules and particles in the atmosphere and comes equally from all directions. If you are interested in more detailed information on the DIF values for any location worldwide, please see our Solar DIF GIS Data Layer, Solar Time-series, and FullView Solar Site Climate Variability Analysis products.