Subject: SOHO/LASCO HALO CME 120929 BACKSIDED
UCMEO 93001 21001 2230/
20929 60012 80718 0802/ 079// 313// 30611
20928 62256 80026 ///// ///// 1112/
99999
PLAIN
SOHO/LASCO observed a HALO CME on September 29, 2012. Event is first
seen in C2 at 00:12 UT as a faint loop surfacing in the Southwest which
produced a symmetric halo at 00:36 UT. The event continues into
the C3 field beginning 00:42 to 07:18 UT where the event dissipates at 19.5 Rsun.
Time/height measurements were marked to 3 points in C2 with speeds
of 727.8 Km/sec at position angle 84 degrees. The event is marked to 6 points
in C3. Speeds average through both fields to 610.8 Km/sec at PA 80 degrees.
Acceleration 42.73 m/sec^2.
SDO/AIA : n/a
STEREO: BEACON Data
COR2 B, 23:55-00:25 UT data gap. In progress, loop expanding over SE.
Preliminary time/height measure gives 945.3 km/sec velocity at LE.
EUVI B, 17:16-22:26 UT data gap. At 22:56 and 23:06 UT, 2 flares from different regions
in close proximity on the limb in East. Both appear to be associated with the halo.
COR2 A, 16:54-02:54 UT data gap. n/a
EUVI A, 17:15-03:05 UT data gap. n/a
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/2012/120929/
Best regards,
Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA
BT
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