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 Jan 01 09:32 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
December 2020 : 21.8 (twenty-one point eight)

Maximum : 50 on 1 // Minimum : 0 on 19, 20

Provisional daily International Sunspot Numbers for December 2020 : 

      1.. 50    6.. 22   11.. 11   16.. 13   21.. 11   26.. 32   31.. 32
      2.. 46    7.. 20   12.. 11   17.. 12   22.. 11   27.. 31
      3.. 43    8.. 13   13.. 11   18..  7   23.. 23   28.. 29
      4.. 39    9.. 13   14.. 13   19..  0   24.. 27   29.. 30
      5.. 36   10.. 12   15.. 19   20..  0   25.. 29   30.. 29

68 cooperating stations on January 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for June 2020 :   7.8 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2020 Jul     9    10     2021 Jan    21    34     2021 Jul    34    72
     Aug    10    13          Feb    23    39          Aug    36    78
     Sep    13    17          Mar    26    45          Sep    39    85
     Oct    15    21          Apr    27    50          Oct    41    92
     Nov    17    25          May    30    56          Nov    44    98
     Dec    19    30          Jun    32    64          Dec    46   105

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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