:Issued: 2010 Apr 12 2053 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 484 from 2010 Apr 05
SOLAR ACTIVITY
--------------
Solar activity was rather low during the week. A halo CME occurred
on April 8, in conjunction with a B3.7 flare, which peaked at 0325 UT.
The source region was NOAA AR 1060, at that time about 20 degrees East
of the central meridian. A southward EUV coronal wave was observed.
GEOMAGNETIC ACTIVITY
--------------------
Geomagnetic activity was dominated from April 5 to 6 by a major
geomagnetic storm (Kp=6), with brief periods of severe storm
conditions (Kp=7) on April 5. Geomagnetic conditions were still
at active levels (Kp=4) on April 7. The source of such disturbances is
a halo CME, which occurred on April 3. A strong interplanetary shock
was observed by the ACE spacecraft at 0756 UT on April 5. In addition,
a fast solar wind stream linked to a coronal hole quickly followed the
arrival of the shock and maintained at active levels an already disturbed
situation. Conditions returned to quiet levels on April 8.
A weak interplanetary shock was observed by the ACE spacecraft on April 11
at 1215 UT, in relation with the halo CME of April 8. A brief period of active
conditions (K=4) was observed at Dourbes station on that day between
18 and 21 UT, while planetary conditions remained at quiet levels.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Apr 05 /// 026 79 050 A4.1 0 0
2010 Apr 06 /// 019 78 039 A3.1 0 0
2010 Apr 07 /// 017 76 024 A3.2 0 0
2010 Apr 08 037 021 76 015 A4.1 0 0
2010 Apr 09 012 007 76 008 A3.5 0 0
2010 Apr 10 011 007 75 003 A4.4 0 0
2010 Apr 11 /// 000 75 018 A2.7 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
#--------------------------------------------------------------------#
# 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 #
#--------------------------------------------------------------------#
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 484 from 2010 Apr 05
SOLAR ACTIVITY
--------------
Solar activity was rather low during the week. A halo CME occurred
on April 8, in conjunction with a B3.7 flare, which peaked at 0325 UT.
The source region was NOAA AR 1060, at that time about 20 degrees East
of the central meridian. A southward EUV coronal wave was observed.
GEOMAGNETIC ACTIVITY
--------------------
Geomagnetic activity was dominated from April 5 to 6 by a major
geomagnetic storm (Kp=6), with brief periods of severe storm
conditions (Kp=7) on April 5. Geomagnetic conditions were still
at active levels (Kp=4) on April 7. The source of such disturbances is
a halo CME, which occurred on April 3. A strong interplanetary shock
was observed by the ACE spacecraft at 0756 UT on April 5. In addition,
a fast solar wind stream linked to a coronal hole quickly followed the
arrival of the shock and maintained at active levels an already disturbed
situation. Conditions returned to quiet levels on April 8.
A weak interplanetary shock was observed by the ACE spacecraft on April 11
at 1215 UT, in relation with the halo CME of April 8. A brief period of active
conditions (K=4) was observed at Dourbes station on that day between
18 and 21 UT, while planetary conditions remained at quiet levels.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Apr 05 /// 026 79 050 A4.1 0 0
2010 Apr 06 /// 019 78 039 A3.1 0 0
2010 Apr 07 /// 017 76 024 A3.2 0 0
2010 Apr 08 037 021 76 015 A4.1 0 0
2010 Apr 09 012 007 76 008 A3.5 0 0
2010 Apr 10 011 007 75 003 A4.4 0 0
2010 Apr 11 /// 000 75 018 A2.7 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)
---------------------------------------------------------------------------
NOTICEABLE EVENTS
DAY BEGIN MAX END LOC XRAY OP TENCM TYPE Cat NOAA NOTE
#--------------------------------------------------------------------#
# 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 #
#--------------------------------------------------------------------#
