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OK0NAG > SOLAR    01.04.08 14:00l 101 Lines 3641 Bytes #999 (0) @ EU
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Subj: Monthly Ri Report
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Subject: Monthly Ri Report
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:Issued: 2008 Apr 01 0938 UTC
:Product: documentation at http://www.sidc.be/products/ri
#--------------------------------------------------------------------#

# MONTHLY REPORT ON THE INTERNATIONAL SUNSPOT NUMBER                 #

# from the SIDC (RWC-Belgium)                                        #

#--------------------------------------------------------------------#


Provisional International monthly mean Sunspot Number for
March 2008 : 9.3 (nine point three)

Maximum : 36 on 26 // Minimum : 0 on 1, 2, 4, 5, 7, 8, 9, 11, 12, 13, 14, 
18, 19, 20, 21, 22, 23

Provisional daily International Sunspot Numbers for March 2008 : 

      1..  0    6..  8   11..  0   16..  7   21..  0   26.. 36   31.. 25

      2..  0    7..  0   12..  0   17..  7   22..  0   27.. 35
      3..  7    8..  0   13..  0   18..  0   23..  0   28.. 34
      4..  0    9..  0   14..  0   19..  0   24.. 19   29.. 30
      5..  0   10..  9   15..  7   20..  0   25.. 32   30.. 31

60 cooperating stations on April 1, 09 UT

Predictions of the monthly smoothed Sunspot Number using the last
provisional value, calculated for September 2007 :   5.9 (+-5%)

            SM    CM                 SM    CM                 SM    CM 
    

2007 Oct     6     6     2008 Apr     3     8     2008 Oct     3    19

     Nov     5     4          May     2    10          Nov     4    21

     Dec     4     4          Jun     2    11          Dec     4    24

2008 Jan     4     5          Jul     2    12     2009 Jan     5    27

     Feb     3     7          Aug     3    14          Feb     5    30

     Mar     3     7          Sep     3    16          Mar     6    33


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

 
#--------------------------------------------------------------------#

# Solar Influences Data analysis Center - RWC Belgium                #

# Royal Observatory of Belgium                                       #

# Fax : 32 (0) 2 373 0 224                                           #

# Tel.: 32 (0) 2 373 0 491                                           #

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