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OK0NAG > SOLAR 01.05.11 11:52l 107 Lines 4039 Bytes #999 (0) @ EU
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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 2011 : 54.4 (fifty-four point four)
Maximum : 91 on 15 // Minimum : 40 on 5, 10, 25
Provisional daily International Sunspot Numbers for April 2011 :
1.. 48 6.. 41 11.. 48 16.. 66 21.. 57 26.. 53
2.. 45 7.. 58 12.. 66 17.. 51 22.. 62 27.. 52
3.. 43 8.. 60 13.. 79 18.. 51 23.. 56 28.. 44
4.. 48 9.. 56 14.. 88 19.. 51 24.. 46 29.. 44
5.. 40 10.. 40 15.. 91 20.. 52 25.. 40 30.. 57
66 cooperating stations on May 1, 10 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for October 2010 : 23.2 (+-5%)
SM CM SM CM SM CM
2010 Nov 26 27 2011 May 50 57 2011 Nov 85 88
Dec 28 32 Jun 56 62 Dec 92 91
2011 Jan 30 38 Jul 61 66 2012 Jan 101 93
Feb 34 43 Aug 67 72 Feb 110 96
Mar 39 47 Sep 73 77 Mar 121 99
Apr 44 52 Oct 79 82 Apr 132 102
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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