Monthly Ri Report

:Issued: 2020 Apr 01 07:50 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
March 2020 : 1.5 (one point five)

Maximum : 15 on 8 // Minimum : 0 on 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13,
14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29

Provisional daily International Sunspot Numbers for March 2020 : 

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

68 cooperating stations on April 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for September 2019 :   3.1 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2019 Oct     2     4     2020 Apr     3    16     2020 Oct     7    38
     Nov     2     6          May     4    19          Nov     8    42
     Dec     2     8          Jun     4    22          Dec     9    46
2020 Jan     2    10          Jul     5    26     2021 Jan    10    51
     Feb     2    12          Aug     5    30          Feb    12    56
     Mar     3    14          Sep     6    34          Mar    13    62

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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