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: 2017 Sep 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
August 2017 : 33.1 (thirty-three point one)

Maximum : 74 on 31 // Minimum : 12 on 13

Provisional daily International Sunspot Numbers for August 2017 : 

      1.. 13    6.. 13   11.. 13   16.. 32   21.. 66   26.. 49   31.. 74
      2.. 13    7.. 13   12.. 13   17.. 45   22.. 64   27.. 38
      3.. 14    8.. 13   13.. 12   18.. 46   23.. 69   28.. 23
      4.. 14    9.. 13   14.. 13   19.. 50   24.. 55   29.. 41
      5.. 13   10.. 15   15.. 22   20.. 60   25.. 54   30.. 53

81 cooperating stations on September 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for February 2017 :  26.6 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2017 Mar    23    23     2017 Sep    20    23     2018 Mar    13    27
     Apr    23    22          Oct    19    24          Apr    12    23
     May    23    20          Nov    18    24          May    10    22
     Jun    22    20          Dec    17    24          Jun     8    21
     Jul    21    22     2018 Jan    16    25          Jul     6    20
     Aug    20    23          Feb    15    27          Aug     5    19

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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