:Issued: 2011 Apr 12 1830 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 536 from 2011 Apr 04
SOLAR ACTIVITY
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Solar activity was rather moderate during the week,
with only a handset of C-class flares. The strongest
one was a C1.9 flare in NOAA AR 1185, occurring on
April 6th, 1807 UT (peak time).
GEOMAGNETIC ACTIVITY
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Geomagnetic activity remained low during most of the
week with the exception of April 6th, when isolated
minor storm conditions (kp=6 and 5 between 1200 and
1800 UT) were observed at planetary levels in
response to a sudden jump in the interplanetary
magnetic field B_t and B_z values. The origin is
probably a sudden and temporary sector boundary
crossing.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Apr 04 068 044 113 008 B3.3 0 0
2011 Apr 05 056 037 109 007 B2.8 0 0
2011 Apr 06 057 035 117 028 B3.1 0 0
2011 Apr 07 096 056 112 005 B3.1 0 0
2011 Apr 08 /// 054 109 016 B2.6 0 0
2011 Apr 09 106 052 105 006 B2.9 0 0
2011 Apr 10 /// 036 105 003 B2.2 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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