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OK0NAG > SOLAR 01.06.09 13:23l 103 Lines 3755 Bytes #999 (0) @ EU
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Subj: 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
May 2009 : 2.9 (two point nine)
Maximum : 11 on 31 // Minimum : 0 on 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12,
20, 21, 24, 25, 26, 27, 28, 29, 30
Provisional daily International Sunspot Numbers for May 2009 :
1.. 0 6.. 0 11.. 0 16.. 8 21.. 0 26.. 0 31.. 11
2.. 0 7.. 0 12.. 0 17.. 9 22.. 8 27.. 0
3.. 0 8.. 0 13.. 7 18.. 8 23.. 8 28.. 0
4.. 7 9.. 0 14.. 9 19.. 7 24.. 0 29.. 0
5.. 0 10.. 0 15.. 8 20.. 0 25.. 0 30.. 0
63 cooperating stations on June 1, 11 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2008 : 1.8 (+-5%)
SM CM SM CM SM CM
2008 Dec 2 2 2009 Jun 11 8 2009 Dec 18 19
2009 Jan 2 3 Jul 12 9 2010 Jan 19 21
Feb 2 4 Aug 13 10 Feb 20 23
Mar 8 5 Sep 14 12 Mar 22 26
Apr 9 6 Oct 15 14 Apr 23 28
May 10 7 Nov 17 17 May 25 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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