Subject: SOHO/LASCO HALO CME 110607b BACKSIDED

UCMEO 93001 10610 1730/
10607 61845 80047 3122/ 311// 113// 30909
10607 61823 81848 ///// 11224 4222/
99999

PLAIN

SOHO/LASCO observed a full symmetric HALO CME on June 07, 2011.  Event is first seen in
C2 at 18:45 UT as a faint loop surrounding the occulter at first frame.
The event continues into the C3 field beginning 19:39 to 00:47 UT out to 22.3 Rsun
where the event dissipates from view.

Time/height measurements were marked to 4 points in C2 with speeds of 951.7 Km/sec
at position angle 319 degrees. The event is marked to 7 points in C3 where it
slightly decelerates.  Speeds average through both fields to 909.6 Km/sec at
PA 312 degrees.  Acceleration -40.98 m/sec^s.


STEREO COR2 A shows an expanding CME in the NW begining 19:09 UT as does COR2 B
in it's NE field.
EUVI A 195 shows AR (previously 11224?) on the limb in the NW with a CME at 18:23 UT.
This is most probably the cause of the HALO event seen in LASCO.

The observation of this event is considered 'FAIR'. This CME is determined a BACKSIDED 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/2011/110607b/

Best regards,

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

BT