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 Mar 01 09:16 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
February 2019 : 0.8 (zero point eight)

Maximum : 12 on 13 // Minimum : 0 on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28

Provisional daily International Sunspot Numbers for February 2019 : 

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

70 cooperating stations on March 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2018 :   6.8 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2018 Sep     7     5     2019 Mar     3     4     2019 Sep     1    15
     Oct     5     3          Apr     2     5          Oct     1    18
     Nov     5     4          May     2     7          Nov     1    21
     Dec     5     4          Jun     1     9          Dec     1    24
2019 Jan     4     4          Jul     1    11     2020 Jan     2    28
     Feb     3     4          Aug     1    13          Feb     2    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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