Free solar-terrestrial data displayed on your web page or site, updated every 3-hours. Also contains solar and radio propagation information applicable to ham radio including solar conditions, space conditions, online propagation tool, online SN to SFI/SFI to SN conversion tool, online Aurora/Auroral activity to latitude conversion tool, and online K-Index to Signal Noise conversion tool.

http://www.hamqsl.com/solar.html