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 Mar 01 09:59 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 2024 : 124.6 (one hundred and twenty-four point six)

Maximum : 167 on 11 // Minimum : 51 on 21

Provisional daily International Sunspot Numbers for February 2024 : 

      1..118    6..157   11..167   16..145   21.. 51   26..137
      2..123    7..150   12..157   17..120   22.. 58   27..120
      3..127    8..165   13..138   18..102   23..106   28..131
      4..137    9..129   14..143   19.. 73   24..111   29..128
      5..157   10..150   15..147   20.. 54   25..115

62 cooperating stations on March 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2023 : 124.0 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2023 Sep   126   124     2024 Mar   129   123     2024 Sep   124   133
     Oct   124   124          Apr   130   122          Oct   122   133
     Nov   116   124          May   131   123          Nov   119   133
     Dec   120   123          Jun   130   126          Dec   117   132
2024 Jan   123   124          Jul   128   129     2025 Jan   115   131
     Feb   126   124          Aug   126   132          Feb   113   129

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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