2.3.0 spase://GBO/NumericalData/SDIC/Sunspot/PT86400.00S Sunspot Numbers 2019-04-30T18:59:39Z Daily and monthly sunspot numbers spase://SMWG/Person/Ronald.Vanderlinden GeneralContact spase://VSPO/NumericalData/P_SDIC_HDR_SIDC_SUNSPOT_NUMBERS spase://VSPO/NumericalData/SDIC/Sunspot/PT86400.00S spase://SMWG/Repository/SIDC Online Open World Data Center for the Sunspot Index, Royal Observatory of Belgium http://sidc.oma.be/html/sunspot.html Text CALIBRATED ActivityIndex 1700-01-01T00:00:00 -P1M Data are available to end of most recent whole month. PT86400.00S Sun Sun.Photosphere