:Issued: 2010 Oct 19 1156 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 511 from 2010 Oct 11
SOLAR ACTIVITY
------------
A filament located in the south east of the solar disk erupted late on Oct 10. In SOHO/LASCO images, the CME was seen as a partial CME. In STEREO Ahead/Behind COR2 it is seen from aside. The speed calculated from STEREO Ahead images by the CACTus software, is 297 km/s; from STEREO Behind images, 337 km/s.
Oct 16, AR 1112 was responsible for an M2.9 flare peaking at 19:12UT. The event lasted only for 8 minutes.
In SWAP images, a small coronal dimming is visible. Although the large filament in the vicinity of this active region did not erupt. SOHO/LASCO and STEREO/SECCHI didn't show any evidence of an associated, strong CME.
The first part of a small, horizontal oriented coronal hole (CH) reached the central meridian on Oct 16. Comparing with previous rotation, the CH shrunk in size.
GEOMAGNETIC ACTIVITY
-------------------
Oct 06, a filament erupted. The shock and the CME arrived on Oct 11. The total interplanetary magnetic field (IMF) rose to values between 10 and 15 nT. ACE passed the shock heading the actual CME.
We suspect that ACE passed along a leg of the plasma cloud measuring a negative Bz for a long period.
The Bz was shifting slowly to zero. This negative Bz of the IMF is optical for reconnection and lead to a short minor geomagnetic storm on Oct 11.
ACE data showed a rather sudden enhancement of the magnetic field carried in the solar wind on Oct 15.
The speed jumped at 03UT from 280 km/s to 290 km/s. The density increased slightly. This was possibly thepassage through the shock in front of the CME associated with the filament eruption of late Oct 10.
The IMF stayed turbulent until Oct 17. Probably, ACE passed side away along the shock. This glancing blow lead to one period with active conditions on Oct 17.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Oct 11 /// 008 75 018 A6.4 0 0
2010 Oct 12 /// 008 75 014 A6.5 0 0
2010 Oct 13 035 016 78 004 A6.7 0 0
2010 Oct 14 054 020 80 001 A7.7 0 0
2010 Oct 15 072 026 82 008 A7.9 0 0
2010 Oct 16 /// 031 87 008 A9.6 1 0
2010 Oct 17 /// 037 84 014 B1.0 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
16 1907 1912 1915 S20W26 M2.9 1N 140 V/2,II/3 48 1112
#--------------------------------------------------------------------#
# 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 511 from 2010 Oct 11
SOLAR ACTIVITY
------------
A filament located in the south east of the solar disk erupted late on Oct 10. In SOHO/LASCO images, the CME was seen as a partial CME. In STEREO Ahead/Behind COR2 it is seen from aside. The speed calculated from STEREO Ahead images by the CACTus software, is 297 km/s; from STEREO Behind images, 337 km/s.
Oct 16, AR 1112 was responsible for an M2.9 flare peaking at 19:12UT. The event lasted only for 8 minutes.
In SWAP images, a small coronal dimming is visible. Although the large filament in the vicinity of this active region did not erupt. SOHO/LASCO and STEREO/SECCHI didn't show any evidence of an associated, strong CME.
The first part of a small, horizontal oriented coronal hole (CH) reached the central meridian on Oct 16. Comparing with previous rotation, the CH shrunk in size.
GEOMAGNETIC ACTIVITY
-------------------
Oct 06, a filament erupted. The shock and the CME arrived on Oct 11. The total interplanetary magnetic field (IMF) rose to values between 10 and 15 nT. ACE passed the shock heading the actual CME.
We suspect that ACE passed along a leg of the plasma cloud measuring a negative Bz for a long period.
The Bz was shifting slowly to zero. This negative Bz of the IMF is optical for reconnection and lead to a short minor geomagnetic storm on Oct 11.
ACE data showed a rather sudden enhancement of the magnetic field carried in the solar wind on Oct 15.
The speed jumped at 03UT from 280 km/s to 290 km/s. The density increased slightly. This was possibly thepassage through the shock in front of the CME associated with the filament eruption of late Oct 10.
The IMF stayed turbulent until Oct 17. Probably, ACE passed side away along the shock. This glancing blow lead to one period with active conditions on Oct 17.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2010 Oct 11 /// 008 75 018 A6.4 0 0
2010 Oct 12 /// 008 75 014 A6.5 0 0
2010 Oct 13 035 016 78 004 A6.7 0 0
2010 Oct 14 054 020 80 001 A7.7 0 0
2010 Oct 15 072 026 82 008 A7.9 0 0
2010 Oct 16 /// 031 87 008 A9.6 1 0
2010 Oct 17 /// 037 84 014 B1.0 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
16 1907 1912 1915 S20W26 M2.9 1N 140 V/2,II/3 48 1112
#--------------------------------------------------------------------#
# 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 #
#--------------------------------------------------------------------#
