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 Mar 01 10:23 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 2017 : 26.1 (twenty-six point one)

Maximum : 59 on 28 // Minimum : 11 on 8

Provisional daily International Sunspot Numbers for February 2017 : 

      1.. 47    6.. 13   11.. 22   16.. 19   21.. 26   26.. 38
      2.. 47    7.. 13   12.. 20   17.. 14   22.. 29   27.. 48
      3.. 39    8.. 11   13.. 19   18.. 13   23.. 24   28.. 59
      4.. 17    9.. 20   14.. 16   19.. 25   24.. 27
      5.. 13   10.. 24   15.. 24   20.. 32   25.. 32

74 cooperating stations on March 1, 10 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2016 :  36.0 (+-5%)

            SM    CM                 SM    CM                 SM    CM     

2016 Sep    33    35     2017 Mar    25    34     2017 Sep    20    34
     Oct    31    36          Apr    24    32          Oct    19    33
     Nov    31    37          May    24    31          Nov    19    31
     Dec    29    37          Jun    23    31          Dec    18    30
2017 Jan    28    36          Jul    22    32     2018 Jan    16    29
     Feb    26    35          Aug    21    33          Feb    15    28

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                     #
# Royal Observatory of Belgium                                       #
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