Provisional International monthly mean Sunspot Number for
February 2010 : 18.6 (eighteen point six)


Maximum : 39 on 8 // Minimum : 8 on 4, 5

Provisional daily International Sunspot Numbers for February 2010 : 

      1.. 11    6.. 24   11.. 29   16.. 20   21.. 11   26.. 18
      2..  9    7.. 21   12.. 27   17.. 28   22.. 11   27..  9
      3..  9    8.. 39   13.. 28   18.. 15   23.. 10   28..  9
      4..  8    9.. 37   14.. 22   19.. 13   24.. 20
      5..  8   10.. 33   15.. 20   20.. 13   25.. 19

58 cooperating stations on March 1, 11 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2009 :   4.8 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2009 Sep     6     7     2010 Mar     5    23     2010 Sep     3    47
     Oct     6     9          Apr     4    27          Oct     3    51
     Nov     8    11          May     4    30          Nov     4    55
     Dec     7    14          Jun     3    34          Dec     4    58
2010 Jan     6    17          Jul     3    38     2011 Jan     5    62
     Feb     6    20          Aug     3    43          Feb     6    65

SM : SIDC classical method : based on an interpolation of Waldmeier's
standard curves; the estimated error ranges from 7% (first month) to
35% (last month)
CM : Combined method : the combined method is a regression technique
coupling a dynamo-based estimator with Waldmeier's idea of standard
curves, due to K. Denkmayr.
ref. : K. Denkmayr, P. Cugnon, 1997 : "About Sunspot Number Medium-Term
Predictions", in "Solar-Terrestrial Prediction Workshop V", eds.
G. Heckman et al., Hiraiso Solar Terrestrial Research Center, Japan, 103