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: 2019 Jan 01 09:31 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
December 2018 : 3.1 (three point one)

Maximum : 20 on 6 // Minimum : 0 on 1, 2, 3, 4, 9, 10, 12, 13, 16, 17, 18, 
          19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

Provisional daily International Sunspot Numbers for December 2018 : 

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

67 cooperating stations on January 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for June 2018 :   7.3 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Jul     7     5     2019 Jan     3     4     2019 Jul     0    13
     Aug     7     4          Feb     2     4          Aug     0    16
     Sep     6     4          Mar     2     5          Sep     0    18
     Oct     5     3          Apr     1     7          Oct     0    21
     Nov     4     3          May     1     9          Nov     1    25
     Dec     3     4          Jun     1    11          Dec     1    28

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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