Subject: SOHO/LASCO HALO CME 110607

UCMEO 93001 10607 1730/
10607 60649 91231 2521/ 251// 233// 40996
10607 60619 80648 35322 11226 1112/
99999

PLAIN

SOHO/LASCO observed a full HALO CME on June 07, 2011.  Event is first seen in
C2 at 06:49 UT as a bright loop over the west hemisphere already to 3.3 Rsun.
The impulsive front expands to a full halo by 07:33.  The event continues
into the C3 field beginning 06:56 to 12:31 UT out to the edge of view at 30 Rsun
which was also the last frame before entering a DSN gap period. This event has a 
considerable amount of proton emission seen in the white light images.

Time/height measurements were marked to 3 points in C2 with speeds of 1062.1 Km/sec
at position angle 268 degrees. The event is marked to 13 points in C3 where it
slightly decelerates.  Speeds average through both fields to 996.1 Km/sec at
PA 258 degrees.  Acceleration -12.65 m/sec^s.


SDO/AIA shows a flare of AR 11226  in the SW quadrant [S22, W53]
beginning 06:19-06:48 UT with a dimming and wave across the South. The
flare triggered a large filament adjacent to the AR on the west to erupt.
NOAA reports a long duration M2.5 Xray flare beginning at 06:16-06:59 UT.
The proton flux in the 10 and 50 MeV range are above "storm levels".
STEREO COR2 A & B sees large CMEs with scattered material beginning 06:54 UT.
EUVI A 195 shows AR 11226 in the south east with a flare at 06:25-06:45 UT
with bright impulsive ejecta.


This is most probably the cause of the full HALO event seen in LASCO.
   
The observation of this event is considered 'GOOD'. This CME is determined a FRONTSIDED event.

Images and movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2011/110607/

Best regards,

Kevin Schenk
Solar Heliospheric Observatory (SOHO)
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT