:Issued: 2011 Feb 04 0736 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 526 from 2011 Jan 24
SOLAR ACTIVITY
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NOAA AR 1149 was the most active region during the week, it produced
several C-class flares: a C1.4 at 06:25 UT on 24 Jan, a C1.2 at
12:05 UT on 27 Jan, a C1.5 at 04:25 UT on 28 Jan and another C1.5
at 10:22 UT on 28 Jan. A stronger, M1.3, flare was also associated
with NOAA AR 1149. It occurred at 01:03 UT on 28 Jan. This flare was
associated with a Type II radio burst, a CME and a proton flux increase.
There were CMEs occurring every day of the week, none of them were
believed to be directed towards the Earth.
GEOMAGNETIC ACTIVITY
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The geomagnetic conditions were quiet to unsettled the whole week.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Jan 24 032 019 83 009 A6.4 0 0
2011 Jan 25 028 018 81 008 A5.7 0 0
2011 Jan 26 /// 016 80 005 A6.1 0 0
2011 Jan 27 /// 014 81 003 A7.2 0 0
2011 Jan 28 015 008 81 006 A9.3 1 0
2011 Jan 29 /// 009 81 005 A6.1 0 0
2011 Jan 30 /// 012 83 001 A5.3 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
28 0044 0103 0110 M1.3 III/1,II/1 01 1149
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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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