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  • Yearly mean total sunspot number

    Yearly time series (1700–2014). It was last modified on 1 Nov 2016 at 17:20.

    • Units: Sunspots
    • Dimensions:
    • Description:

      Yearly mean total sunspot number obtained by taking a simple arithmetic mean of the daily total sunspot number over all days of each year. (NB: in early years in particular before 1749, the means are computed on only a fraction of the days in each year because on many days, no observation is available).

    • Last updated: 1 Nov 2016
    • Citing: WDC-SILSO, Royal Observatory of Belgium, Brussels
    • Access: Public
    • Price: Free