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 Jun 01 09:01 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
May 2019 : 10.1 (ten point one)

Maximum : 27 on 11 // Minimum : 0 on 1, 2, 3, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 30, 31

Provisional daily International Sunspot Numbers for May 2019 : 

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

67 cooperating stations on June 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2018 :   6.7 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Dec     6     7     2019 Jun     4     6     2019 Dec     3    18
2019 Jan     6     7          Jul     3     8     2020 Jan     3    21
     Feb     6     6          Aug     3    10          Feb     3    24
     Mar     6     6          Sep     3    11          Mar     3    27
     Apr     5     5          Oct     3    13          Apr     3    31
     May     4     5          Nov     3    15          May     4    36

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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