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OK0NAG > SOLAR 01.03.11 11:53l 106 Lines 4020 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
February 2011 : 29.4 (twenty-nine point four)
Maximum : 53 on 14 // Minimum : 9 on 6, 7
Provisional daily International Sunspot Numbers for February 2011 :
1.. 15 6.. 9 11.. 35 16.. 48 21.. 29 26.. 26
2.. 13 7.. 9 12.. 37 17.. 40 22.. 23 27.. 27
3.. 18 8.. 39 13.. 48 18.. 49 23.. 19 28.. 31
4.. 22 9.. 31 14.. 53 19.. 50 24.. 13
5.. 16 10.. 21 15.. 51 20.. 42 25.. 10
65 cooperating stations on March 1, 10 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2010 : 17.4 (+-5%)
SM CM SM CM SM CM
2010 Sep 18 21 2011 Mar 30 53 2011 Sep 47 82
Oct 20 28 Apr 33 58 Oct 49 85
Nov 21 33 May 35 63 Nov 52 88
Dec 23 39 Jun 38 67 Dec 55 91
2011 Jan 26 44 Jul 41 71 2012 Jan 58 93
Feb 28 49 Aug 44 76 Feb 60 96
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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