Monthly Ri Report

:Issued: 2025 Mar 01 09:50 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
February 2025 : 154.7 (one hundred and fifty-four point seven)

Maximum : 206 on 16 // Minimum : 94 on 11

Provisional daily International Sunspot Numbers for February 2025 : 

      1..158    6..186   11.. 94   16..206   21..166   26..124
      2..189    7..161   12..104   17..204   22..178   27..130
      3..188    8..134   13..117   18..174   23..187   28..117
      4..176    9..127   14..161   19..133   24..164
      5..164   10..109   15..172   20..140   25..166

63 cooperating stations on March 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2024 : 156.7 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2024 Sep   165   157     2025 Mar   144   142     2025 Sep   132   119
     Oct   166   155          Apr   142   140          Oct   130   119
     Nov   156   153          May   139   136          Nov   129   119
     Dec   153   150          Jun   138   132          Dec   127   118
2025 Jan   150   147          Jul   136   127     2026 Jan   125   118
     Feb   147   144          Aug   134   122          Feb   123   117

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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