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: 2022 Oct 01 08:33 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
September 2022 : 96.4 (ninety-six point four)

Maximum : 150 on 24 // Minimum : 62 on 1

Provisional daily International Sunspot Numbers for September 2022 : 

      1.. 62    6.. 75   11..129   16.. 92   21.. 83   26..134
      2.. 64    7.. 97   12..141   17.. 85   22..106   27..109
      3.. 69    8.. 97   13..117   18.. 73   23..131   28.. 86
      4.. 72    9..102   14.. 91   19.. 71   24..150   29.. 72
      5.. 84   10..117   15..102   20.. 69   25..134   30.. 76

69 cooperating stations on October 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for March 2022 :  68.9 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2022 Apr    75    73     2022 Oct   108    99     2023 Apr   148   120
     May    79    78          Nov   114   103          May   157   121
     Jun    84    83          Dec   120   107          Jun   165   121
     Jul    91    88     2023 Jan   126   110          Jul   173   121
     Aug    97    93          Feb   132   114          Aug   181   121
     Sep   103    96          Mar   140   118          Sep   189   120

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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