Global Radiation Solar radiation, direct and diffuse, received from a solid angle of 2p steradians on a horizontal surface. Source: World Meteorological Organization, Meteoterm Originally from the CUAHSI HIS VariableNameCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=VariableNameCV. ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables.