Monthly Ri Report

:Issued: 2012 Feb 01 2007 UTC
:Product: documentation at http://www.sidc.be/products/ri
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# MONTHLY REPORT ON THE INTERNATIONAL SUNSPOT NUMBER                 #
# from the SIDC (RWC-Belgium)                                        #
#--------------------------------------------------------------------#

Provisional International monthly mean Sunspot Number for
January 2012 : 58.3 (fifty-eight point three)

Maximum : 95 on 16 // Minimum : 28 on 28

Provisional daily International Sunspot Numbers for January 2012 : 

      1.. 44    6.. 70   11.. 39   16.. 95   21.. 69   26.. 30   31.. 46
      2.. 57    7.. 70   12.. 32   17.. 87   22.. 67   27.. 40
      3.. 74    8.. 64   13.. 44   18.. 78   23.. 70   28.. 28
      4.. 78    9.. 49   14.. 73   19.. 65   24.. 53   29.. 35
      5.. 67   10.. 43   15.. 92   20.. 63   25.. 47   30.. 38

68 cooperating stations on February 1, 20 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for July 2011 :  57.2 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2011 Aug    62    61     2012 Feb    98    87     2012 Aug   146   111
     Sep    65    65          Mar   106    91          Sep   152   112
     Oct    73    70          Apr   115    96          Oct   157   113
     Nov    78    74          May   124   101          Nov   161   113
     Dec    84    79          Jun   132   104          Dec   165   114
2012 Jan    90    83          Jul   140   108     2013 Jan   167   115

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

 
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