Subject: SOHO/LASCO HALO CME 120711 BACKSIDED
UCMEO 93001 20716 1800/
20711 60125 80642 1102/ 109// 113// 30380
20710 62345 80035 ///// ///// 1122/
99999
PLAIN
SOHO/LASCO observed a full HALO CME on July 11, 2012. Event is
first seen in C2 at 01:25 UT as a faint asymmetric halo (east).
The event continues into the C3 field beginning 01:54 to 06:42 UT
as the cme dissipates in C3 at approximately 20 Rsun.
Time/height measurements were marked to 9 points in C2 with speeds
of 344.4 Km/sec at position angle 110 degrees. The event is marked to 5 points
in C3. Speeds average through both fields to 379.6 Km/sec at PA 110 degrees.
Acceleration 36.62 m/sec^2.
SDO/AIA: n/a
STEREO: Beacon data
COR2 A, 22:24-01:24 UT data gap. 01:24-04:39 UT as a bright loop expanding
over west hemisphere.
Preliminary time/height measure gives 645.6 km/sec velocity at LE.
EUVI A, 22:15-01:15 UT data gap. n/a.
COR2 B, 00:54-04:39 UT, expanding burst over the east hemisphere.
Preliminary time/height measure gives 468.5 km/sec velocity at LE.
EUVI B, 23:45-00:35 UT, a cme on SE limb with wave.
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/2012/120711
Best regards,
Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA
BT
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