SOHO/LASCO HALO CME
120512
UCMEO
93001 20516 1920/
20512
60000 80630 1171/ 116// 213// 30962
20511
62318 80051 21516 ///// 2212/
99999
PLAIN
SOHO/LASCO
observed a HALO CME on May 12, 2012. Event is first seen in C2 at
00:00 UT
with a wide faint loop surfacing along the east. The loop expands
with
extensions to a full halo by 00:36 UT. A bright loop with core is
seen
over the
equatorial east area. This is a separate part of the associated
loop system.
The event
continues into the C3 field beginning 00:30-06:30 UT out to the edge of
field
at 30 Rsun
in the SE.
Time/height
measurements were marked at 4 points in C2 with speeds of 922.4 Km/sec
at
position angle 118 degrees. The event is marked to 7 points in
C3. Speeds
average
through both fields to 961.7 Km/sec at PA 118 degrees. Acceleration of
8.13
m/sec^2.
SDO AIA
193 shows activated loops of a region in the SE with sigmoidal
properties
located at
[S16,E15]. Beginning 23:24 UT, a dimming of the area with flaring and
arcade.
AIA 304
shows a filament eruption of the region 23:18-00:51 UT with ejecta from
the
northern edge of the region.
STEREO: HR
data
COR2
B, 23:53-02:24 UT, a loop expanding over the west.
Preliminary
time/height measure gives 1083.4 km/sec velocity at LE.
EUVI B
195, 22:50 UT loops over limb activate and erupt by 23:15-00:10 UT.
EUVI B
304, 23:11-00:31 UT filament material eruption off the west limb.
COR2 A,
23:54-03:24 UT shows an asymmetric halo east.
Preliminary
time/height measure gives 727.7 km/sec velocity at LE.
EUVI A
195, 23:05 UT Activated loops which erupt 23:20-23:55 UT. A 2nd emission
north
beginning 00:55-01:20 UT which seems associated.
EUVI A
304, 23:26-00:56 UT, CME off east limb.
NOAA
reports a flare 23:41-00:01 UT from location [S17,E14]
The
observation of this event is considered 'FAIR'. This CME is determined
FRONTSIDED.
Images and
movies and time/height information for this event is available on the
web at:
http://umbra.nascom.nasa.gov/lasco/observations/halo/2012/120512/
Best
regards,
Kevin
Schenk
Solar
Heliospheric Observatory
EIT and
LASCO Operations
NASA-Goddard
Space Flight Center, USA
BT
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