This plot provides a look at the progression of the NWRA effective smoothed sunspot number (SSNe) for solar cycle 23 and the start of cycle 24. The heavy solid curve is the smoothed SSNe (centered 13-month average), the light solid curve is the monthly average SSNe, and the dotted curve is a sunspot number calculated from the smoothed F10.7 solar flux. The foF2 and 10.7cm solar flux data used in these calculations were obtained from the NOAA Space Weather Prediction Center (SWPC). The heavy dashed line is the official prediction for the maximum smoothed sunspot number provided by the SWPC, predicted to occur during October 2013 (indicated on the plot by an uncertainty bar which shows the uncertainty specified by the SWPC). The light dashed line is a prediction from NASA for the maximum smoothed sunspot number, predicted to be in Fall 2013.
Please note that the SSNe values plotted here were calculated in near real-time from a limited data set. If you are interested in post-analysis SSNe values calculated from a more representative data set, please contact NWRA.
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