Monthly Ri Report

:Issued: 2019 May 01 08:14 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
April 2019 : 9.1 (nine point one)

Maximum : 24 on 18, 19 // Minimum : 0 on 6, 22, 23, 24, 25, 26, 27, 28, 29,
30

Provisional daily International Sunspot Numbers for April 2019 : 

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

70 cooperating stations on May 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for October 2018 :   6.9 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Nov     6     7     2019 May     3     6     2019 Nov     2    18
     Dec     5     7          Jun     3     8          Dec     2    21
2019 Jan     6     7          Jul     2    10     2020 Jan     2    24
     Feb     5     6          Aug     2    11          Feb     3    27
     Mar     5     5          Sep     2    13          Mar     3    32
     Apr     4     5          Oct     2    15          Apr     3    36

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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