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OK0NAG > SOLAR 01.05.08 10:01l 100 Lines 3637 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
April 2008 : 2.9 (two point nine)
Maximum : 16 on 1 // Minimum : 0 on 5, 6, 7, 8, 9, 10, 11, 12, 15, 16,
17, 18, 20, 21, 25, 26, 27, 28, 29, 30
Provisional daily International Sunspot Numbers for April 2008 :
1.. 16 6.. 0 11.. 0 16.. 0 21.. 0 26.. 0
2.. 9 7.. 0 12.. 0 17.. 0 22.. 8 27.. 0
3.. 9 8.. 0 13.. 7 18.. 0 23.. 8 28.. 0
4.. 7 9.. 0 14.. 7 19.. 8 24.. 7 29.. 0
5.. 0 10.. 0 15.. 0 20.. 0 25.. 0 30.. 0
64 cooperating stations on May 1, 08 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for October 2007 : 6.0 (+-5%)
SM CM SM CM SM CM
2007 Nov 5 5 2008 May 3 8 2008 Nov 3 19
Dec 4 3 Jun 2 9 Dec 4 21
2008 Jan 5 4 Jul 2 11 2009 Jan 4 24
Feb 4 5 Aug 2 12 Feb 5 27
Mar 4 6 Sep 3 14 Mar 5 30
Apr 3 7 Oct 3 16 Apr 6 33
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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