Monthly Ri Report

Provisional daily, monthly and monthly smoothed sunspot numbers.
Source SIDC (RWC-Belgium)
Frequency Monthly
Format Plain text
Mail header Monthly Ri Report
SIDC code ri

Latest issue

:Issued: 2018 Jul 01 08:15 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
June 2018 : 15.9 (fifteen point nine)

Maximum : 56 on 20 // Minimum : 0 on 4, 5, 8, 9, 10, 11, 28, 29, 30

Provisional daily International Sunspot Numbers for June 2018 : 

      1.. 24    6.. 11   11..  0   16.. 14   21.. 50   26.. 14
      2.. 22    7.. 10   12.. 12   17.. 14   22.. 41   27.. 14
      3.. 13    8..  0   13.. 15   18.. 29   23.. 38   28..  0
      4..  0    9..  0   14.. 15   19.. 34   24.. 19   29..  0
      5..  0   10..  0   15.. 14   20.. 56   25.. 17   30..  0

75 cooperating stations on July 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for December 2017 :  15.1 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Jan    14    13     2018 Jul     2     6     2019 Jan     0     6
     Feb     9    12          Aug     0     6          Feb     0     4
     Mar     9    11          Sep     0     6          Mar     0     6
     Apr     7     8          Oct     0     6          Apr     0     8
     May     6     7          Nov     0     6          May     0    10
     Jun     4     6          Dec     0     6          Jun     0    11

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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