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OK0NAG > SOLAR 01.11.08 12:08l 101 Lines 3657 Bytes #999 (0) @ EU
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Subj: Monthly Ri Report
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Subject: Monthly Ri Report
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#--------------------------------------------------------------------#
# MONTHLY REPORT ON THE INTERNATIONAL SUNSPOT NUMBER #
# from the SIDC (RWC-Belgium) #
#--------------------------------------------------------------------#
Provisional International monthly mean Sunspot Number for
October 2008 : 2.9 (two point nine)
Maximum : 12 on 16 // Minimum : 0 on 1, 2, 3, 5, 6, 7, 8, 9, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30
Provisional daily International Sunspot Numbers for October 2008 :
1.. 0 6.. 0 11.. 9 16.. 12 21.. 0 26.. 0 31..
9
2.. 0 7.. 0 12.. 11 17.. 8 22.. 0 27.. 0
3.. 0 8.. 0 13.. 9 18.. 0 23.. 0 28.. 0
4.. 7 9.. 0 14.. 9 19.. 0 24.. 0 29.. 0
5.. 0 10.. 7 15.. 8 20.. 0 25.. 0 30.. 0
67 cooperating stations on November 1, 09 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for April 2008 : 3.3 (+-5%)
SM CM SM CM SM CM
2008 May 3 4 2008 Nov 5 10 2009 May 11 22
Jun 3 5 Dec 6 11 Jun 12 24
Jul 2 6 2009 Jan 7 12 Jul 13 27
Aug 3 7 Feb 8 14 Aug 14 30
Sep 4 8 Mar 9 17 Sep 15 32
Oct 5 9 Apr 10 19 Oct 17 35
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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