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OK0NAG > SOLAR 01.03.09 12:40l 100 Lines 3640 Bytes #999 (0) @ EU
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Subj: Monthly Ri Report
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Date: Sun, 1 Mar 2009 10:34:34 GMT
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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 2009 : 1.4 (one point four)
Maximum : 8 on 11, 24, 25 // Minimum : 0 on 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 26, 27, 28
Provisional daily International Sunspot Numbers for February 2009 :
1.. 0 6.. 0 11.. 8 16.. 0 21.. 0 26.. 0
2.. 0 7.. 0 12.. 7 17.. 0 22.. 0 27.. 0
3.. 0 8.. 0 13.. 7 18.. 0 23.. 0 28.. 0
4.. 0 9.. 0 14.. 0 19.. 0 24.. 8
5.. 0 10.. 0 15.. 0 20.. 0 25.. 8
58 cooperating stations on March 1, 10 UT
Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for August 2008 : 2.7 (+-5%)
SM CM SM CM SM CM
2008 Sep 2 3 2009 Mar 8 8 2009 Sep 15 19
Oct 2 4 Apr 9 9 Oct 16 21
Nov 2 5 May 10 11 Nov 17 24
Dec 6 6 Jun 11 12 Dec 18 26
2009 Jan 6 6 Jul 12 15 2010 Jan 20 29
Feb 7 7 Aug 13 17 Feb 21 32
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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