:Issued: 2011 Sep 05 1319 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 557 from 2011 Aug 29
SOLAR ACTIVITY
==========
Solar activity was low to moderate during the
past week. Most of the week was indeed low in
terms of flaring activity, with only minor C
flares until Sept. 4th, when a M3.2 flare
occurred at 1145 UT (peak time) in
NOAA AR 1286, close to the west limb. Strong
C flares (C8.3 and C9) had occurred the same
day prior to the M flare in the same region.
GEOMAGNETIC ACTIVITY
===============
Geomagnetic activity was low during the week
with only a brief period of unsettled conditions
early on Sept. 3rd at planetary levels (Kp=3) due
to a small coronal hole becoming geoeffective.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Aug 29 /// 037 101 011 B2.9 0 0
2011 Aug 30 /// 061 101 004 B2.4 0 0
2011 Aug 31 /// 084 109 001 B2.6 0 0
2011 Sep 01 142 085 112 003 B2.9 0 0
2011 Sep 02 182 091 115 006 B3.3 0 0
2011 Sep 03 172 095 119 013 B4.9 0 0
2011 Sep 04 /// 070 119 012 B6.3 1 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
04 1121 1145 1150 M3.2 VI/1 1286
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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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