:Issued: 2011 Jan 25 0818 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 525 from 2011 Jan 17
SOLAR ACTIVITY
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The most noticeable sunspot group/active region of this week was Cat 98/NOAA AR 1147. On Jan 17,
the group was located on the east of the solar disk. From Jan 21, when the group was located near
the central meridian, an extra bi polar sunspot group Cat 01/NOAA AR 1149 grew. The rising phase
of this area introducing an additional magnetic complexity, involved several C-flares on Jan 21, 22 and 24.
On Jan 24, NOAA AR 1149 has a beta-gamma configuration, while NOAA AR 1147 has an alpha configuration.
The fact that both regions lie in each others vicinity, increases the chances for magnetic interaction leading to
instability and energy releases.
GEOMAGNETIC ACTIVITY
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The geomagnetic conditions were quiet this week. Kp did not exceed the value t-2.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Jan 17 033 018 82 008 A9.0 0 0
2011 Jan 18 036 020 81 006 A5.7 0 0
2011 Jan 19 031 017 81 009 A5.7 0 0
2011 Jan 20 /// 019 82 008 A6.8 0 0
2011 Jan 21 043 022 88 005 B1.1 0 0
2011 Jan 22 041 021 88 004 B1.0 0 0
2011 Jan 23 /// 021 84 002 A7.7 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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