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How to find sunspot data
I use the official
SIDC monthly indexes, available on line from the Royal
Observatory of Belgium. It must be noted that the last
monthly values are premiminary results which can be changed later.
One can find the results of various observation centers, or even from a
diffuse observation network around the world among the
"SONNE" W3 Site.
I would recommend two sites :
- one designed by
on the subject of radio propagation. Lots of useful links on real
time available solar data.
- one designed by Jan Alvestad and the
"DX Listeners club", with
an useful page on solar activity and also a lot of links.