Monthly Ri Report

:Issued: 2018 Sep 01 08:41 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
August 2018 : 8.8 (eight point eight)

Maximum : 33 on 25 // Minimum : 0 on 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
29, 30, 31

Provisional daily International Sunspot Numbers for August 2018 : 

      1.. 12    6..  0   11..  0   16.. 13   21.. 16   26.. 28   31..  0
      2.. 11    7..  0   12..  0   17.. 12   22.. 12   27.. 13
      3..  0    8..  0   13..  0   18.. 11   23.. 15   28.. 12
      4..  0    9..  0   14.. 12   19.. 14   24.. 29   29..  0
      5..  0   10..  0   15.. 13   20.. 16   25.. 33   30..  0

67 cooperating stations on September 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for February 2018 :  12.6 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Mar     8    12     2018 Sep     2     6     2019 Mar     0     4
     Apr     9    11          Oct     1     5          Apr     0     5
     May     9     8          Nov     0     4          May     0     7
     Jun     7     7          Dec     0     4          Jun     0     9
     Jul     5     7     2019 Jan     0     4          Jul     0    11
     Aug     3     6          Feb     0     4          Aug     0    13

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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