Surface Solar Energy Data Set 74 monthly-averaged satellite data parameters, global radiation data for 1195 ground sites data tables for a particular location
Solar Radiation Resource Publications This website contains links to various on-line publications that are available on the RReDC http://rredc.nrel.gov/solar/pubs/
S@tel-Light Einstrahlungsdaten für beliebige Standorte in Europa in Form von Zeitreihen, Karten, statistischer Verteilung oder Mittelwerten verschiedener zeitlicher Auflösung http://www.satellight.com/