Yearly mean total sunspot number --------------------------------- Time range: 1700 - 2014 Data 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). ------------------------------------------------------------------------------- TXT ------------------------------------------------------------------------------- Filename: yearssn.dat Format: plain ASCII text Contents: Column 1: Gregorian calendar year (mid-year date) Column 2: Yearly mean total sunspot number. Column 3: Definitive/provisional marker. A blank indicates that the value is definitive. A '*' symbol indicates that the yearly average still contains provisional daily values and is subject to a possible revision. Line format [character position]: - [1-6] Year (decimal) - [8-12] Yearly mean total sunspot number - [14] Definitive/provisional indicator for monthly numbers ------------------------------------------------------------------------------- CSV ------------------------------------------------------------------------------- Filename: ISSN_Y_tot.csv Format: Comma Separated values (adapted for import e.g. in MS Excel) Contents: Column 1: Gregorian calendar year (mid-year date) Column 2: Yearly mean total sunspot number. Column 3: Definitive/provisional marker. '1' indicates that the value is definitive. '0' indicates that the yearly average still contains provisional daily values and is subject to a possible revision.