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OK0NAG > SOLAR 01.09.11 12:42l 108 Lines 4045 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
August 2011 : 50.6 (fifty point six)
Maximum : 96 on 31 // Minimum : 0 on 14
Provisional daily International Sunspot Numbers for August 2011 :
1.. 82 6.. 61 11.. 29 16.. 24 21.. 56 26.. 66 31.. 96
2.. 73 7.. 61 12.. 22 17.. 39 22.. 71 27.. 59
3.. 62 8.. 54 13.. 14 18.. 45 23.. 75 28.. 49
4.. 71 9.. 47 14.. 0 19.. 46 24.. 54 29.. 43
5.. 68 10.. 28 15.. 9 20.. 45 25.. 50 30.. 69
71 cooperating stations on September 1, 10 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for February 2011 : 33.4 (+-5%)
SM CM SM CM SM CM
2011 Mar 35 36 2011 Sep 66 67 2012 Mar 102 99
Apr 39 41 Oct 71 72 Apr 111 102
May 45 46 Nov 76 78 May 120 105
Jun 50 50 Dec 81 83 Jun 129 107
Jul 56 55 2012 Jan 87 88 Jul 136 109
Aug 61 61 Feb 94 93 Aug 143 111
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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