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: 2021 Sep 01 09:06 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
August 2021 : 22.4 (twenty-two point four)

Maximum : 75 on 28 // Minimum : 0 on 7, 8, 10

Provisional daily International Sunspot Numbers for August 2021 : 

      1..  8    6..  9   11.. 19   16.. 20   21.. 17   26.. 48   31.. 40
      2.. 13    7..  0   12..  8   17.. 15   22.. 19   27.. 70
      3.. 17    8..  0   13.. 10   18.. 13   23.. 17   28.. 75
      4.. 17    9..  7   14.. 20   19.. 22   24.. 21   29.. 51
      5.. 24   10..  0   15.. 23   20.. 13   25.. 35   30.. 43

69 cooperating stations on September 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for February 2021 :  19.1 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2021 Mar    22    23     2021 Sep    31    53     2022 Mar    44    86
     Apr    21    28          Oct    33    59          Apr    48    90
     May    23    33          Nov    35    65          May    52    94
     Jun    25    37          Dec    38    71          Jun    57    98
     Jul    27    41     2022 Jan    40    77          Jul    61   101
     Aug    29    47          Feb    41    82          Aug    64   104

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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# Sunspot Index and Long-term Solar Observations                     #
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