NGDC Sunspots and 10.7cm Flux, 1749-1992Jun
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This dataset contains daily and monthly sunspot numbers for various periods between 1749 and 1992 and daily and monthly solar flux from 1947. The most current data should be available from the National Geophysical Data Center (NGDC) through their web site. [http://www.ngdc.noaa.gov/ngdc.html]
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