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 Nov 01 09:00 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 2022 : 95.4 (ninety-five point four)

Maximum : 165 on 3, 4 // Minimum : 35 on 20

Provisional daily International Sunspot Numbers for October 2022 : 

      1..111    6..162   11..105   16.. 75   21.. 59   26.. 82   31.. 63
      2..131    7..163   12..103   17.. 72   22.. 69   27.. 86
      3..165    8..154   13.. 86   18.. 51   23.. 51   28.. 89
      4..165    9..128   14.. 83   19.. 49   24.. 53   29.. 87
      5..161   10..121   15.. 44   20.. 35   25.. 77   30.. 77

63 cooperating stations on November 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for April 2022 :  73.1 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2022 May    79    77     2022 Nov   108   102     2023 May   142   121
     Jun    84    82          Dec   113   106          Jun   149   121
     Jul    87    87     2023 Jan   118   109          Jul   156   121
     Aug    92    92          Feb   123   113          Aug   163   121
     Sep    98    95          Mar   129   116          Sep   170   120
     Oct   103    98          Apr   135   118          Oct   177   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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