3490 20180130135743.0 DATASET-2018-0016 Clette, F. International Sunspot Number 2017 Total, North, South, daily, monthly mean, monthly smoothed, yearly mean sunspot number time series (1700 to present) World Data Center SILSO, Sunspot Index and Long-term Solar Observations , 1 - 12/2017 Dataset released under the open data policy. STCE Lefèvre, L. david.berghmans@observatoire.be http://www.sidc.be/silso/datafiles DATASET