Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Average diurnal course of global and derived diffuse radiation at ECSF met station (1998–2005). b The diffuse fraction from six decomposition functions is also shown as a function of the clearness index (bottom). For abbreviations, see text
