Monthly Ri Report

:Issued: 2024 Jun 01 08:08 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 2024 : 171.7 (one hundred and seventy-one point seven)

Maximum : 243 on 13 // Minimum : 112 on 25

Provisional daily International Sunspot Numbers for May 2024 : 

      1..116    6..202   11..170   16..211   21..177   26..128   31..155
      2..144    7..193   12..200   17..200   22..164   27..142
      3..160    8..173   13..243   18..179   23..144   28..163
      4..183    9..180   14..203   19..183   24..142   29..169
      5..183   10..173   15..210   20..155   25..112   30..165

62 cooperating stations on June 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2023 : 127.8 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2023 Dec   122   129     2024 Jun   127   129     2024 Dec   114   132
2024 Jan   120   129          Jul   125   132     2025 Jan   112   131
     Feb   124   129          Aug   123   134          Feb   110   129
     Mar   126   127          Sep   121   135          Mar   108   130
     Apr   127   126          Oct   119   135          Apr   106   130
     May   128   127          Nov   117   133          May   104   128

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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