giovedì 21 aprile 2011

SIDC Weekly Bulletin

:Issued: 2011 Apr 20 1329 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 537 from 2011 Apr 11 

SOLAR ACTIVITY
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Six ARs were active in producing mostly C-class flares  during the week (NOAA
ARs 1185, 1186, 1189, 1190, 1191 and 1193). There was an M1.3 flare from AR 1190,
at 17:12 UT on April 15. CMEs occurred every day with only one directed partially
towards the Earth, consequence of a filament eruption in the southeast of the
Sun on April 14 around 23:00 UT.

GEOMAGNETIC ACTIVITY
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A fast solar wind stream arrived to the Earth on April 12 and produced a
minor geomagnetic storm with two three-hour periods of Kp=5.


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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2011 Apr 11  075    043  106  012  B3.0  0  0
2011 Apr 12  092    055  110  023  B3.9  0  0
2011 Apr 13  132    070  118  011  B5.5  0  0
2011 Apr 14  154    082  119  005  B5.8  0  0
2011 Apr 15  ///    082  129  006  B6.2  1  0
2011 Apr 16  ///    064  119  004  B5.5  0  0
2011 Apr 17  ///    049  114  003  B4.1  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
15  1702  1712 1728 N14W19 M1.3 1F 64                                  1190


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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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