:Issued: 2010 Dec 07 1914 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 518 from 2010 Nov 29
SOLAR ACTIVITY
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Flaring activity was limited.
A filament near the central meridian in the northern hemisphere erupted late Nov 28.
The CME came into the view of STEREO A COR2 at 23:54UT, Nov 28. The eruption was
directed above the ecliptic. According to EUV-solar disk images and magnetograms,
the flux rope had a WNE magnetic configuration. Such a configuration does not
lead to strong reconnection with the earth magnetic field, in case of arrival.
Another plasma eruption took place on Nov 30, 17:43UT in the east of the
solar disk. Evidence for this eruption was a coronal dimming and an
EUV-wave. The source region had no NOAA or Catania numbering. The CME was
visible in STEREOA/COR2 and HI1 data. It was propagating slightly
above the ecliptic and to the east.
GEOMAGNETIC ACTIVITY
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The geomagnetic conditions were very quiet this week with Kp between 0 and 2.
We could determine in ACE data of Nov 03, around 21:30UT the arrival of a
small shock as the density increased abruptly. The temperature and the speed
of the plasma following this (small) jump, increased also. This feature in
the solar wind data is possibly a glancing blow of one of the two filament
eruptions. But as already mentioned, the magnetic field of the Earth was
not disturbed.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Nov 29 023 016 83 006 A9.2 0 0
2010 Nov 30 042 015 86 004 B1.1 0 0
2010 Dec 01 043 018 87 004 B1.1 0 0
2010 Dec 02 035 020 87 004 B1.1 0 0
2010 Dec 03 /// 023 87 001 B1.2 0 0
2010 Dec 04 052 030 87 002 B1.1 0 0
2010 Dec 05 /// 025 88 002 B1.1 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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