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: 2019 Apr 01 08:22 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 2019 : 9.5 (nine point five)

Maximum : 37 on 21 // Minimum : 0 on 1, 2, 3, 4, 13, 15, 16, 17, 25, 26,
27, 28, 29, 30

Provisional daily International Sunspot Numbers for March 2019 : 

      1..  0    6.. 18   11.. 11   16..  0   21.. 37   26..  0   31.. 12
      2..  0    7.. 16   12.. 11   17..  0   22.. 30   27..  0
      3..  0    8.. 11   13..  0   18.. 13   23.. 22   28..  0
      4..  0    9.. 11   14.. 13   19.. 16   24.. 15   29..  0
      5.. 14   10.. 11   15..  0   20.. 33   25..  0   30..  0

70 cooperating stations on April 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for September 2018 :   6.6 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Oct     6     7     2019 Apr     3     4     2019 Oct     1    15
     Nov     5     7          May     2     6          Nov     1    18
     Dec     5     6          Jun     2     8          Dec     1    21
2019 Jan     4     6          Jul     1    10     2020 Jan     2    24
     Feb     4     5          Aug     1    11          Feb     2    27
     Mar     3     5          Sep     1    13          Mar     3    32

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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