lunedì 9 maggio 2011

SIDC Weekly Bulletin

:Issued: 2011 May 03 1353 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 539 from 2011 Apr 25 

SOLAR ACTIVITY
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Solar activity was low during the whole week. Even though there were
always more than five ARs present on the visible Sun, only C-flares
were observed due to the lack of complexity in the active regions.
The largest flare was a C3.8 from NOAA AR 1203, peaking at 00:26 UT
on April 29. No Earth directed CMEs were seen.

GEOMAGNETIC ACTIVITY
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Geomagnetic activity was quiet during most of the week. On April 29
a fast wind stream from a coronal hole arrived to the Earth and
produced extended periods of active conditions plus a minor
geomagnetic storm on April 30.
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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2011 Apr 25  ///    036  112  004  B3.1  0  0
2011 Apr 26  ///    044  109  003  B2.8  0  0
2011 Apr 27  ///    047  108  002  B2.7  0  0
2011 Apr 28  069    033  110  004  B2.4  0  0
2011 Apr 29  091    037  110  ///  B2.6  0  0
2011 Apr 30  ///    048  110  ///  B3.4  0  0
2011 May 01  ///    042  106  ///  B2.9  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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