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SIDC Weekly Bulletin

:Issued: 2010 Apr 21 1611 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 485 from 2010 Apr 12 

SOLAR ACTIVITY
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Solar activity was low during the whole week with no significant flares. The main point to notice is a CME which occurred on April 13. It was linked to a rather spectacular polar crown filament eruption observed by a ground based Halpha coronagraph and different EUV space born telescopes. The CME was partially halo as seen from Earth but in the end, it did not trigger any geomagnetic disturbances.

GEOMAGNETIC ACTIVITY
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Geomagnetic activity was moderate during the week, with a brief period of major storm conditions observed at planetary (Kp=6) and local (K=7 at Dourbes) levels  on April 12. The cause of this was the halo CME of  April 8, whose associated interplanetary shock reached the ACE spacecraft on April 11.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2010 Apr 12   ///    008   75   019   A2.3   0   0
2010 Apr 13   011    007   75   003   A2.0   0   0
2010 Apr 14   011    000   75   012   A1.9   0   0
2010 Apr 15   000    000   75   009   A2.0   0   0
2010 Apr 16   000    000   75   003   A1.9   0   0
2010 Apr 17   ///    000   74   005   A3.4   0   0
2010 Apr 18   ///    000   75   004   A3.7   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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