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OK0NAG > SOLAR 01.10.09 11:38l 101 Lines 3703 Bytes #999 (0) @ EU
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#--------------------------------------------------------------------#
# MONTHLY REPORT ON THE INTERNATIONAL SUNSPOT NUMBER #
# from the SIDC (RWC-Belgium) #
#--------------------------------------------------------------------#
Provisional International monthly mean Sunspot Number for
September 2009 : 4.2 (four point two)
Maximum : 20 on 23, 24 // Minimum : 0 on 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20
Provisional daily International Sunspot Numbers for September 2009 :
1.. 8 6.. 0 11.. 0 16.. 0 21.. 8 26.. 9
2.. 0 7.. 0 12.. 0 17.. 0 22.. 12 27.. 7
3.. 0 8.. 0 13.. 0 18.. 0 23.. 20 28.. 10
4.. 0 9.. 0 14.. 0 19.. 0 24.. 20 29.. 9
5.. 0 10.. 0 15.. 0 20.. 0 25.. 17 30.. 7
64 cooperating stations on October 1, 09 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for March 2009 : 2.0 (+-5%)
SM CM SM CM SM CM
2009 Apr 2 3 2009 Oct 15 12 2010 Apr 23 30
May 2 4 Nov 16 14 May 25 32
Jun 2 5 Dec 18 17 Jun 27 35
Jul 12 7 2010 Jan 19 20 Jul 28 39
Aug 13 8 Feb 20 23 Aug 30 43
Sep 14 10 Mar 22 26 Sep 32 47
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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