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: 2024 Nov 01 09:44 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
October 2024 : 166.3 (one hundred and sixty-six point three)

Maximum : 246 on 27, 28 // Minimum : 109 on 15

Provisional daily International Sunspot Numbers for October 2024 : 

      1..212    6..169   11..136   16..119   21..162   26..220   31..213
      2..210    7..163   12..126   17..141   22..119   27..246
      3..209    8..142   13..137   18..137   23..122   28..246
      4..211    9..141   14..136   19..133   24..136   29..224
      5..182   10..141   15..109   20..132   25..178   30..206

63 cooperating stations on November 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for April 2024 : 144.4 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2024 May   152   147     2024 Nov   162   145     2025 May   145   128
     Jun   159   148          Dec   159   143          Jun   143   126
     Jul   174   150     2025 Jan   155   139          Jul   141   123
     Aug   171   150          Feb   152   136          Aug   139   120
     Sep   168   150          Mar   150   134          Sep   137   119
     Oct   165   148          Apr   147   132          Oct   135   119

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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