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 Aug 01 08:17 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 2021 : 34.4 (thirty-four point four)

Maximum : 75 on 22 // Minimum : 0 on 30

Provisional daily International Sunspot Numbers for July 2021 : 

      1.. 57    6.. 50   11.. 22   16.. 35   21.. 72   26.. 31   31..  2
      2.. 61    7.. 20   12.. 23   17.. 50   22.. 75   27.. 21
      3.. 61    8.. 17   13.. 19   18.. 48   23.. 55   28..  7
      4.. 51    9.. 12   14.. 29   19.. 49   24.. 31   29..  4
      5.. 44   10.. 16   15.. 22   20.. 46   25.. 36   30..  0

69 cooperating stations on August 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for January 2021 :  17.3 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2021 Feb    20    21     2021 Aug    28    54     2022 Feb    39    93
     Mar    21    26          Sep    29    61          Mar    42    97
     Apr    20    31          Oct    32    68          Apr    46   102
     May    22    36          Nov    34    75          May    51   105
     Jun    24    41          Dec    36    82          Jun    56   109
     Jul    25    47     2022 Jan    38    88          Jul    59   112

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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