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 Aug 01 08:03 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
July 2022 : 91.4 (ninety-one point four)

Maximum : 152 on 16 // Minimum : 34 on 31

Provisional daily International Sunspot Numbers for July 2022 : 

      1.. 58    6.. 82   11..125   16..152   21..109   26.. 91   31.. 34
      2.. 64    7.. 95   12..114   17..140   22.. 99   27.. 58
      3.. 55    8.. 87   13..117   18..126   23.. 97   28.. 42
      4.. 59    9.. 93   14..123   19..110   24.. 79   29.. 43
      5.. 78   10..106   15..134   20..133   25.. 86   30.. 43

67 cooperating stations on August 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for January 2022 :  60.1 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2022 Feb    66    63     2022 Aug   108    95     2023 Feb   161   117
     Mar    72    68          Sep   115    98          Mar   174   119
     Apr    77    74          Oct   123   102          Apr   186   120
     May    85    79          Nov   131   106          May   198   121
     Jun    93    84          Dec   140   110          Jun   210   121
     Jul   100    90     2023 Jan   150   113          Jul   220   121

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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