:Issued: 2010 Nov 29 1355 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 517 from 2010 Nov 22
SOLAR CONDITIONS
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During the past week, solar activity was quite low. The GOES X-ray flux was mostly at A-level, with a few isolated B-flares.
On Nov 24, STEREO/COR2 and LASCO observed a CME around 4h24. This eruption however, did not affect the Earth. On the same day, the SDO/AIA 304 movie shows 3 filament eruptions. These were also not geo-effective. Several eruptions at the back of the Sun were observed on Nov 26 and Nov 27.
GEOMAGNETIC CONDITIONS
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Geomagnetic conditions were quiet during the most of the week.
The solar wind speed decreased from 500 km/s on monday Nov 22 to 350 km/s on Nov 27. Late on Nov 27 a shock in all solar wind parameters was observed due to the arrival of a recurrent coronal wind stream. This caused a short period of unsettled geomagnetic conditions: Kp reached a maximum of Kp=4. The solar wind speed increased again to around 500 km/s.
The SIDC all quiet alert remained valid during the whole week
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Nov 22 041 016 75 006 A4.3 0 0
2010 Nov 23 029 012 75 011 A4.8 0 0
2010 Nov 24 012 008 76 008 A5.0 0 0
2010 Nov 25 025 015 78 004 A5.0 0 0
2010 Nov 26 024 014 76 002 A4.6 0 0
2010 Nov 27 024 012 77 018 A4.6 0 0
2010 Nov 28 /// 021 80 010 A6.5 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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