Abstract: The National Environmental Satellite, Data and Information Service (NESDIS) has developed an operational procedure to estimate hourly and daily totals of global solar radiation (insolation) from geostationary operational ...

Abstract: The frequency that clear days (0.0 sky cover) occur within each week of the year was determined for 14 North-Central region stations. A remarkably consistent and nearly region-wide feature of a high frequency of clear days ...

Abstract: In 1973 an Eppley Laboratory pyrgeometer was installed on a field site in St. Paul, Minn., to measure atmospheric radiation (Ld). Based on comparisons between measured and calculated Ld for clear nights and low overcast ...