PPT-What do sunspots tell us about recent and past trends in so

Frédéric Clette amp Laure Lefèvre Royal Observatory of Belgium WDC SILSO ESWW11 Nov 2014 SN and GN recalibration early preview 21112014 ESWW11 Nov 2014

nov 2014 cycle esww11 2014 nov esww11 cycle sunspot solar spots dpd small cycles 2013 spot ratio stara number

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