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OK0NAG > SOLAR    01.02.18 12:52l 112 Lines 4039 Bytes #999 (0) @ EU
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Subj: Monthly SILSO report: International Sunspot Number and forecasts
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Subject: Monthly SILSO report: International Sunspot Number and forecasts
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:Issued: 2018 Feb 01 09:40 UTC
:Product: documentation at http://www.sidc.be/products/ri 
#-------------------------------------------------------------#
# MONTHLY TABLE OF THE INTERNATIONAL TOTAL SUNSPOT NUMBER     #
# AND 12-MONTH PREDICTIONS from the World Data Center SILSO   #
#-------------------------------------------------------------#

Provisional International monthly mean Sunspot Number for
January 2018 : 6.7 (six point seven)

Maximum : 22 on 10 // Minimum : 0 on 1, 2, 3, 12, 13, 20, 21, 22, 23, 

                                     24, 25, 26, 27, 28, 29

Provisional daily International Sunspot Numbers for January 2018 : 

      1..  0    6.. 11   11.. 12   16.. 16   21..  0   26..  0   31.. 12

      2..  0    7.. 11   12..  0   17.. 15   22..  0   27..  0
      3..  0    8.. 13   13..  0   18.. 12   23..  0   28..  0
      4.. 12    9.. 16   14.. 11   19.. 11   24..  0   29..  0
      5.. 11   10.. 22   15.. 12   20..  0   25..  0   30.. 11

71 cooperating stations on February 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for July 2017 :  21.0 (+-5%)

            SM    CM                 SM    CM                 SM    CM 
    

2017 Aug    20    18     2018 Feb    15    10     2018 Aug     6     7

     Sep    19    15          Mar    14     9          Sep     4     6

     Oct    19    15          Apr    12     8          Oct     3     6

     Nov    19    15          May    11     8          Nov     2     5

     Dec    18    14          Jun     9     7          Dec     2     4

2018 Jan    16    11          Jul     7     7     2019 Jan     1     4


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




#--------------------------------------------------------------------#

# World Data Center SILSO                                            #

# Sunspot Index and Long-term Solar Observations                     #

# Royal Observatory of Belgium                                       #

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# Please do not reply directly to this message                       #

# For more information, contact: silso.info@oma.be                   #

# or visit first our Web site at: http://www.sidc.be/silso           # 
 
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