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OK0NAG > SOLAR 01.06.08 11:12l 101 Lines 3653 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
May 2008 : 2.9 (two point nine)
Maximum : 15 on 18 // Minimum : 0 on 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 14,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
Provisional daily International Sunspot Numbers for May 2008 :
1.. 0 6.. 0 11.. 0 16.. 14 21.. 0 26.. 0 31..
0
2.. 0 7.. 0 12.. 0 17.. 12 22.. 0 27.. 0
3.. 0 8.. 0 13.. 8 18.. 15 23.. 0 28.. 0
4.. 7 9.. 0 14.. 0 19.. 11 24.. 0 29.. 0
5.. 8 10.. 0 15.. 9 20.. 7 25.. 0 30.. 0
63 cooperating stations on June 1, 09 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for November 2007 : 5.7 (+-5%)
SM CM SM CM SM CM
2007 Dec 5 4 2008 Jun 3 10 2008 Dec 3 21
2008 Jan 4 5 Jul 2 11 2009 Jan 4 24
Feb 5 6 Aug 2 13 Feb 4 27
Mar 4 7 Sep 2 14 Mar 5 30
Apr 4 8 Oct 2 16 Apr 5 33
May 3 9 Nov 3 19 May 6 36
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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