4 links
Solar Influence Data Center
sidc.oma.be
RWC Brussels World Data Center for the Sunspot Index. Features archives, forecasts and information.
Solar Radiation Resource Information
rredc.nrel.gov
Resource offering data archives, models, calculators and scientific reports.
The SOHO Archive
sohowww.nascom.nasa.gov
Allows searches from the sources involved in this ESA - NASA project by setting observation period, wavelength, coordinates, objects and instrument.