sabato 8 gennaio 2011

SIDC Weekly Bulletin

:Issued: 2011 Jan 03 2211 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 522 from 2010 Dec 27 

SOLAR ACTIVITY
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Solar activity was fairly low during the last week. On December 31 the X-ray flux background level increased from A level to B level.
The GOES spacecraft observed a C1.3 flare on this day around 4:20 UT, occurring in NOAA AR 11138. In the following days, several B-flares were observed originating from NOAA AR 11140. The strongest of these were a B9.2 flare at 19:34 UT on December 31 and a a B8.3 flare reaching its maximum at 21:59 UT on January 1. In the beginning of the week, there were two active regions on the disk: NOAA 11136 and 11137. This number of active regions increased up to six active regions on January 2.
Several CME's were observed by SOHO/LASCO and STEREO/COR1-2, e.g. on December 28 and 29. None of these were directed towards the Earth. A small filament in the north-east quadrant erupted yesterday around 15:19 UT as observed in the SWAP images. 

GEOMAGNETIC ACTIVITY
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In the morning of December 28, a shock was observed in all solar wind parameters by the ACE spacecraft. This was due to the
arrival of the CME observed on December 23 and caused minor storm conditions in the early afternoon. Kp reached a maximum value of 5 for one 3h period. Afterwards, geomagnetic conditions returned to a quiet level for the rest of the week.

The SIDC all quiet alert was valid during the whole week, except for the brief storm period on December 28.

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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2010 Dec 27  027    010  80  002  A3.6  0  0
2010 Dec 28  ///    012  81  010  A4.5  0  0
2010 Dec 29  027    016  83  005  A5.5  0  0
2010 Dec 30  024    008  83  005  A6.5  0  0
2010 Dec 31  ///    025  91  004  A8.9  0  0
2011 Jan 01  ///    ///  -1  006  B1.0  0  0
2011 Jan 02  ///    031  91  006  A8.8  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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