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: 2020 Aug 01 08:12 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 2020 : 6.3 (six point three)

Maximum : 22 on 28, 29, 30, 31 // Minimum : 0 on 2, 3, 8, 9, 10, 11, 12,
13, 14, 16, 17, 18, 19, 20

Provisional daily International Sunspot Numbers for July 2020 : 

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

72 cooperating stations on August 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for January 2020 :   2.2 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2020 Feb     3     3     2020 Aug     5    14     2021 Feb    11    34
     Mar     3     5          Sep     6    16          Mar    13    38
     Apr     3     7          Oct     7    19          Apr    15    42
     May     4     8          Nov     8    23          May    17    46
     Jun     4    10          Dec     9    26          Jun    19    51
     Jul     5    11     2021 Jan    10    30          Jul    21    57

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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