mercoledì 13 aprile 2011

SIDC Weekly Bulletin

: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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