Monthly Ri Report

:Issued: 2018 Jun 01 08:34 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
May 2018 : 13.2 (thirteen point two)

Maximum : 36 on 27 // Minimum : 0 on 1, 2, 3, 14, 15, 16, 17, 18, 19, 20

Provisional daily International Sunspot Numbers for May 2018 : 

      1..  0    6.. 15   11.. 11   16..  0   21.. 11   26.. 27   31.. 22
      2..  0    7.. 14   12.. 13   17..  0   22.. 13   27.. 36
      3..  0    8.. 20   13.. 12   18..  0   23.. 28   28.. 19
      4.. 13    9.. 23   14..  0   19..  0   24.. 35   29.. 23
      5.. 14   10.. 11   15..  0   20..  0   25.. 30   30.. 20

70 cooperating stations on June 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2017 :  15.4 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2017 Dec    15    14     2018 Jun     1     6     2018 Dec     0     5
2018 Jan    11    12          Jul     0     6     2019 Jan     0     4
     Feb     8    12          Aug     0     6          Feb     0     4
     Mar     7     9          Sep     0     6          Mar     0     4
     Apr     5     8          Oct     0     6          Apr     0     5
     May     3     7          Nov     0     6          May     0     7

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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