:Issued: 2010 Nov 15 1323 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 515 from 2010 Nov 08
SOLAR CONDITIONS
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Solar flaring activity was on B and C flaring level during this week. Two active regions in each others vicinity were responsible for most of this activity: Catania sunspot group 59 (NOAA AR 1121) and group 62 (NOAA AR 1123), which developed strongly on Nov 11 inside the western part of NOAA 1121. At this time GOES X-ray flux showed repeated B and C flares. This must have been related to the magnetic flux emergence as observed in magnetogram movies from HMI/SDO. STEREO images indicated that a halo CME was associated with this activity. This continuous flaring activity remained until noon Nov 13 when solar activity returned to very quiet conditions again.
There were two filament eruptions in the northern hemisphere this week. A filament erupted from the north-east on Aug 8 around 15 UT. The associated CME that is observed in LASCO is not expected to be geoeffective. Another filament erupted early on Nov 13 in the northern hemisphere at central meridian. At first glance the associated CME seems to be directed northward. We expect only a small influence at earth (if there is any influence at all) of this CME.
GEOMAGNETIC CONDITIONS
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Geomagnetic conditions have been quiet with active intervals on Nov 11-12. This could have been due to the arrival of CMEs of past solar activity. The IMF oscillated between +10 and -10 nT and the wind speed reached values of around 500 km/s. At around noon Nov 14 the wind speed increased further to 650 km/s.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Nov 08 066 024 84 004 A9.6 0 0
2010 Nov 09 045 018 84 002 A9.0 0 0
2010 Nov 10 074 036 86 005 A9.9 0 0
2010 Nov 11 074 032 85 020 B1.0 0 0
2010 Nov 12 060 026 85 018 B1.0 0 0
2010 Nov 13 070 046 85 010 B1.0 0 0
2010 Nov 14 /// /// 86 010 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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