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OK0NAG > SOLAR 02.05.09 09:19l 101 Lines 3707 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
April 2009 : 1.2 (one point two)
Maximum : 8 on 29, 30 // Minimum : 0 on 1, 2, 3, 4, 5, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 27, 28
Provisional daily International Sunspot Numbers for April 2009 :
1.. 0 6.. 7 11.. 0 16.. 0 21.. 7 26.. 0
2.. 0 7.. 0 12.. 0 17.. 0 22.. 7 27.. 0
3.. 0 8.. 0 13.. 0 18.. 0 23.. 0 28.. 0
4.. 0 9.. 0 14.. 0 19.. 0 24.. 0 29.. 8
5.. 0 10.. 0 15.. 0 20.. 0 25.. 0 30.. 8
62 cooperating stations on May 1, 09 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for October 2008 : 1.9 (+-5%)
SM CM SM CM SM CM
2008 Nov 2 2 2009 May 10 8 2009 Nov 17 19
Dec 2 3 Jun 11 9 Dec 18 21
2009 Jan 2 4 Jul 12 10 2010 Jan 19 24
Feb 7 5 Aug 13 12 Feb 21 26
Mar 8 6 Sep 14 14 Mar 22 29
Apr 9 7 Oct 16 17 Apr 24 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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