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 Jan 01 09:33 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 2017 : 8.2 (eight point two)

Maximum : 30 on 24 // Minimum : 0 on 1, 2, 3, 4, 5, 8, 9, 13, 14, 15, 16, 
                                     17, 18, 28, 29, 30

Provisional daily International Sunspot Numbers for December 2017 : 

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

71 cooperating stations on January 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for June 2017 :  22.3 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2017 Jul    22    21     2018 Jan    17    12     2018 Jul     8     7
     Aug    22    20          Feb    16    11          Aug     7     7
     Sep    21    17          Mar    15    10          Sep     5     6
     Oct    20    16          Apr    13     9          Oct     4     6
     Nov    20    16          May    12     8          Nov     3     5
     Dec    19    16          Jun    10     8          Dec     3     4

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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