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SIDC Weekly Bulletin

:Issued: 2011 Dec 13 0756 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity            #
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WEEK 571 from 2011 Dec 05 

SOLAR ACTIVITY
————–
Solar activity was low with only a few C flares (GOES X-ray
background at B level). There were up to 10 active regions
present on the solar disk early in the week. The main active
region was Catania#66 (NOAA 11363), of type Dki with a Beta-
Gamma magnetic configuration. This region decayed over the
second half of the week.
No low-latitude coronal hole was seen on the solar disk. The only
noteworthy event was the eruption of a large filament in the NE
quadrant of the solar disk on Dec.11, around 6:00UT.

GEOMAGNETIC ACTIVITY
——————–
During the first 4 days of the week, the solar wind speed
remained below 400 km/s with a weak interplanetary magnetic
field. This led to very quiet geomagnetic conditions.
On Dec.9, the entrance in a new heliospheric sector brought a
slight increase of the interplanetary magnetic field and of
solar wind speed (450 km/s). This induced unsettled conditions
during the last 3 days of the week.

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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2011 Dec 05  226    098  158  003  B5.2  0  0
2011 Dec 06  ///    102  151  001  B4.7  0  0
2011 Dec 07  ///    087  149  001  B4.5  0  0
2011 Dec 08  ///    109  145  003  B4.4  0  0
2011 Dec 09  ///    078  144  004  B3.8  0  0
2011 Dec 10  ///    070  140  012  B4.2  0  0
2011 Dec 11  ///    065  134  008  B4.7  0  0
# RC  : Sunspot index (Wolf Number) from Catania Observatory (Italy)
# EISN : Estimated International Sunspot Number
# 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 TENCM TYPE                      Cat NOAA NOTE

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# 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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