Monthly Ri Report

:Issued: 2017 Jun 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
May 2017 : 18.8 (eighteen point eight)

Maximum : 55 on 23 // Minimum : 0 on 9, 10, 13, 14, 15, 30, 31

Provisional daily International Sunspot Numbers for May 2017 : 

      1.. 12    6.. 27   11.. 11   16.. 25   21.. 36   26.. 25   31..  0
      2.. 28    7.. 23   12.. 14   17.. 12   22.. 50   27.. 24
      3.. 18    8.. 11   13..  0   18.. 24   23.. 55   28.. 21
      4.. 17    9..  0   14..  0   19.. 24   24.. 20   29.. 14
      5.. 31   10..  0   15..  0   20.. 30   25.. 31   30..  0

80 cooperating stations on June 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2016 :  29.9 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2016 Dec    30    27     2017 Jun    20    23     2017 Dec    15    30
2017 Jan    26    27          Jul    20    25     2018 Jan    14    29
     Feb    24    25          Aug    19    26          Feb    13    28
     Mar    23    25          Sep    18    27          Mar    12    27
     Apr    22    24          Oct    17    28          Apr    10    23
     May    21    22          Nov    16    29          May     8    22

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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