giovedì 30 dicembre 2010

SIDC Weekly Bulletin

:Issued: 2010 Dec 29 0751 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 521 from 2010 Dec 20 

SOLAR ACTIVITY
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On Dec 15 however, a plasma structure high in the corona left the Sun.
It was clearly seen in STEREO COR2 images. LASCO on board SOHO
could also capture it but it looked very faint. The CME was not recognized
as a halo in LASCO.
Further, the Sun took a small Christmas holiday: no flares were measured.

GEOMAGNETIC ACTIVITY
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A shock leading the plasma cloud reached ACE on Dec 19. The cloud itself
passed on Dec 20. It was possibly the plasma structure that left the Sun
on Dec 15. The cloud can be recognized by the slowly varying magnetic
field components. Only unsettled conditions were measured on Dec 20.
Further this week, we had also a geomagnetic silence.
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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2010 Dec 20  011    000  78  010  A3.7  0  0
2010 Dec 21  022    000  78  003  A3.5  0  0
2010 Dec 22  013    007  78  ///  A3.3  0  0
2010 Dec 23  ///    008  80  ///  A3.3  0  0
2010 Dec 24  025    008  79  003  A3.4  0  0
2010 Dec 25  ///    013  79  006  A3.5  0  0
2010 Dec 26  ///    016  81  004  A3.5  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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