Solar Influences Data Center (SIDC) / RWC Belgium
Royal Observatory of Belgium
E-mail: Pierre.Cugnon@oma.be
http://sidc.oma.be

SIDC WEEKLY BULLETIN
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WEEK 163 from 2004 Feb 09  

SOLAR ACTIVITY:
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The most active day on the flaring level was Monday February 9. However, the highest flare 
registered was a C9.6 coming from sunspot group 57 (NOAA 0554). From February 10 on, the 
background x-radiation started decreasing slowly to reach finally the top of the A-level on 
Sunday February 15. Only on Feb 10 and Feb 11, some recordable peaks were noticed (in the 
lower B-level).
Space Weather this week was dominated by a coronal hole. The solar wind speed started increasing 
clearly from Feb 11 to reach 700 km/s. Feb 15 peaks up to 800 km/s were measured by ACE. At the 
moment, Feb 16, the solar wind speed is slowly decreasing.


GEOMAGNETISM:
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Geomagnetic activity was dominated by the coronal hole. On Feb 11, we came in the influence sphere 
of it.  The solar wind speed was only just begun to increase, when the K_p index as calculated 
by NOAA, reached the major storm level of 6. Feb 12, once again the minor storm level was reached. 
The rest of the week, active conditions were set with one exception on Sunday Feb 15 when NOAA 
reported K_p=5 for the time interval 9:00-12:00UT. Since the moment of that small peak, we are 
experiencing quiet conditions.
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DAILY INDICES
DATE           RC   10CM   Ak   BKG    M   X
2004 Feb 09   065   118   007   B3.0   0   0
2004 Feb 10   087   117   007   B2.0   0   0
2004 Feb 11   087   114   025   B1.9   0   0
2004 Feb 12   086   112   032   B1.9   0   0
2004 Feb 13   070   108   ///   B1.7   0   0
2004 Feb 14   052   104   025   B1.3   0   0
-1 XXX XX   083   -1   ///   ////   -1   -1
# RC  : Sunspot index from Catania Observatory (Italy)
# 10cm: 10.7 cm  radioflux (DRAO, Canada)
# Ak  : Ak Index Wingst (Germany)
# BKG : Background GOES X-ray level (NOAA, USA)
# M,X : Number of X-ray flares in M and X class, see below (NOAA, USA)
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NOTICEABLE EVENTS
DAY BEGIN MAX  END  LOC   XRAY OP  10CM   TYPE               Cat  NOAA NOTE