SOHO/LASCO HALO CME 110602ab

UCMEO 93001 11206 1640/
10602 60724 81442 1081/ 107// 323// 40842
10602 60627 80654 21419 11227 1112/
99999

PLAIN

SOHO/LASCO observed two (2) HALO CMEs on June 2, 2011.  Event is
first seen in C2 at 07:24 UT as a LE loop front over the southeast.
A second loop is seen shortly after in same area beginning 08:12 UT.
The event is a full halo by 08:36 UT.  Event continues into the C3 
field beginning 08:30 to 14:42 UT to 30 Rsun.

Time/height measurements were marked at 4 points in C2 with speeds of 991.5 Km/sec
at position angle 109 degrees. The event is marked to 11 points in C3.  Speeds
average through both fields to 841.7 Km/sec at PA 108 degrees. Acceleration of
-40.95 m/sec^2. 

AIA 193 shows a flare of AR 11227 06:27-06:54 UT located at [S19, E14] with wave
propagating east and north.  A second flare of AR 11227 beginning 07:21-07:42
produces a wave over the east hemisphere on disk.
STEREO: Beacon data
COR2 B,  08:24-10:54 UT a burst expanding over the west. 
Preliminary time/height measure gives 1083.0 km/sec velocity at LE.
EUVI B, 06:28-06:50 UT CME with wave from AR near west limb in south.
COR2 A, 08:08-10:54 UT impulsive burst overtaking cme at 07:08 UT in east field.
Preliminary time/height measure gives 1096.0 km/sec velocity at LE.
EUVI A, 07:38-08:05 UT, cme over east limb.


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/2011/110602ab/

Best regards,

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

BT