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OK0NAG > SOLAR 03.05.10 11:39l 103 Lines 3791 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
April 2010 : 7.9 (seven point nine)
Maximum : 25 on 4 // Minimum : 0 on 14, 15, 16, 17, 18, 19, 20, 23, 24,
26, 27, 29
Provisional daily International Sunspot Numbers for April 2010 :
1.. 17 6.. 19 11.. 8 16.. 0 21.. 7 26.. 0
2.. 17 7.. 16 12.. 8 17.. 0 22.. 7 27.. 0
3.. 18 8.. 22 13.. 7 18.. 0 23.. 0 28.. 8
4.. 25 9.. 7 14.. 0 19.. 0 24.. 0 29.. 0
5.. 24 10.. 8 15.. 0 20.. 0 25.. 12 30.. 7
66 cooperating stations on May 1, 11 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for October 2009 : 7.0 (+-5%)
SM CM SM CM SM CM
2009 Nov 8 9 2010 May 17 28 2010 Nov 31 55
Dec 9 12 Jun 19 32 Dec 33 58
2010 Jan 11 15 Jul 21 36 2011 Jan 36 62
Feb 13 18 Aug 23 41 Feb 40 65
Mar 14 21 Sep 25 46 Mar 44 67
Apr 16 25 Oct 28 51 Apr 47 69
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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