:Issued: 2011 Jun 27 2203 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 547 from 2011 Jun 20
SOLAR ACTIVITY
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Solar activity was rather low during the week, with a moderate flaring
activity. A remarkable long duration event occurred on June 21st in NOAA
AR 1236 near the central meridian. Peaking at 03:25 UT on that day, the
C7.7 flare was associated with a moderately fast CME (800-1000 km/s), which
was observed by the LASCO and COR2 coronagraphs.
GEOMAGNETIC ACTIVITY
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Geomagnetic activity was mostly quiet during the week, with a brief
period of active conditions at planetary levels, on June 22 (18-21UT)
and June 23 (0-6UT), due to a fast solar wind stream linked to a
coronal hole. No obvious geomagnetic impact was noticed due to the
CME of June 21st, despite a favorable position on the disk of
its source region, at the time of the eruption.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Jun 20 061 026 96 008 B2.1 0 0
2011 Jun 21 067 032 95 014 B2.1 0 0
2011 Jun 22 /// 032 93 018 B1.5 0 0
2011 Jun 23 067 038 96 021 B1.7 0 0
2011 Jun 24 075 043 96 018 B1.6 0 0
2011 Jun 25 /// 034 94 /// B1.7 0 0
2011 Jun 26 /// 019 90 /// B1.6 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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