HelioClim Solar Radiation
- Sun radiation atlas based on processing of Meteosat data.
- http://www.helioclim.org/index.html

Services for Professionals in Solar Energy and Radiation
- Resource with information and databases on solar radiation and energy. Includes Java based calculators for a range of scientific and industrial domains.
- http://www.soda-is.com/

Solar Radiation Resource Information
- Resource offering data archives, models, calculators and scientific reports.
- http://rredc.nrel.gov/solar/

World Radiation Data Centre
- Archive of world wide solar radiation and radiation balance data, 1964-1993.
- http://wrdc-mgo.nrel.gov/

Solar Data Analysis Center (SDAC)
- Offers data resources, including solar images, solar news, eclipse information, flares, sunspots and overview of NASA's solar physics programs.
- http://umbra.gsfc.nasa.gov/sdac.html

Solar Influence Data Center
- RWC Brussels World Data Center for the Sunspot Index. Features archives, forecasts and information.
- http://sidc.oma.be/

Solar Data Analysis Center
- Features links to data resources. Also includes images, news, eclipse information. Based at NASA Goddard Space Flight Center in Greenbelt, Md.
- http://umbra.nascom.nasa.gov/sdac.html

Solar UV Atlas from HRTS
- A brief presentation of its features.
- http://umbra.nascom.nasa.gov/uv_atlas/atlas.html

The SOHO Archive
- Allows searches from the sources involved in this ESA - NASA project by setting observation period, wavelength, coordinates, objects and instrument.
- http://sohowww.nascom.nasa.gov/data/