lunedì 9 agosto 2010

SIDC Weekly Bulletin

:Issued: 2010 Aug 09 1240 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 501 from 2010 Aug 02 

SOLAR ACTIVITY
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Solar activity was rather low most of the week, until the appearance on the east limb of NOAA AR 1093 which produced a C1.3 flare on Aug. 5th (peak time 21:35 UT) and a M1 flare on Aug. 7 (peak time 18:24 UT), associated with a metric type II burst, an EUV coronal wave and a halo CME. A weak SEP event (< 5pfu at 10 MeV) occurred on Aug. 3rd from 15 UT till Aug. 4th 6UT. The source region was probably located to the north-west of NOAA AR 1092. Up to five active regions (with sunspots) were visible at the same time on the solar disk (Aug. 7).

GEOMAGNETIC ACTIVITY
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Geomagnetic activity was dominated by a period of active to minor storm conditions related to the complex solar event of Aug. 1st involving two CMEs . A first shock, arrived at the Earth on Aug. 3rd just before 17:00 UT and triggered 12 hours of minor storm conditions at planetary levels (Kp of 5 and 6). The 2nd CME probably arrived on Aug. 4th around 10:00 UT when a signature of a magnetic cloud was detected by the ACE spacecraft. Active to minor storms conditions were still observed until Aug. 5th (03:00 UT).

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DAILY INDICES
DATE          RC  EISN  10CM  Ak  BKG    M  X
2010 Aug 02  034    014  79  007  B1.0  0  0
2010 Aug 03  020    009  81  025  B1.0  0  0
2010 Aug 04  040    019  81  047  B1.0  0  0
2010 Aug 05  062    032  83  009  B1.1  0  0
2010 Aug 06  058    033  82  008  B1.2  0  0
2010 Aug 07  062    029  91  005  B1.0  1  0
2010 Aug 08  ///    ///  83  006  A9.9  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
07  1755  1824 1847 N11E34 M1.0 2F 100  II/2                      12  1093


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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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