Monthly Ri Report

:Issued: 2024 Apr 01 08:22 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
March 2024 : 104.9 (one hundred and four point nine)

Maximum : 167 on 25 // Minimum : 50 on 30

Provisional daily International Sunspot Numbers for March 2024 : 

      1..119    6..101   11.. 75   16.. 63   21..162   26..141   31.. 66
      2.. 97    7.. 97   12.. 84   17.. 74   22..164   27..114
      3..101    8..102   13.. 81   18..119   23..157   28.. 98
      4..109    9.. 95   14.. 70   19..134   24..166   29.. 81
      5..111   10.. 77   15.. 53   20..124   25..167   30.. 50

61 cooperating stations on April 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for September 2023 : 123.8 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2023 Oct   126   124     2024 Apr   124   122     2024 Oct   115   133
     Nov   119   123          May   124   123          Nov   113   133
     Dec   114   123          Jun   123   126          Dec   111   132
2024 Jan   118   124          Jul   121   129     2025 Jan   109   131
     Feb   120   124          Aug   119   132          Feb   107   129
     Mar   123   123          Sep   117   133          Mar   105   130

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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