mercoledì 25 agosto 2010

SIDC Weekly Bulletin

:Issued: 2010 Aug 24 2031 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 503 from 2010 Aug 16 

SOLAR ACTIVITY
-------------

NOAA AR 1098 was the dominant active region during the period. On Aug 18 it was  positioned on the North West
limb and triggered the biggest flare of the period: a C4.5 long duration flare at 05:48. The event was associated
with a coronal mass ejection and an  increase in solar proton fluxes, that however did not pass the event
threshold levels (10 fpu at 10 MeV).

Following this event,  the active region rotated behind the North West limb, an SIDC ALL QUIET ALERT was issued
and indeed, no more flaring activity was observed.

GEOMAGNETIC ACTIVITY
-------------------

Geomagnetic activity was very low during the period and never went higher than the Kp=3 level.



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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2010 Aug 16  062    033  85  008  B1.4  0  0
2010 Aug 17  025    016  81  007  B1.4  0  0
2010 Aug 18  023    014  81  005  B1.3  0  0
2010 Aug 19  011    006  78  004  A6.9  0  0
2010 Aug 20  023    003  77  004  A6.2  0  0
2010 Aug 21  011    000  76  003  A5.6  0  0
2010 Aug 22  ///    000  75  002  A4.9  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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