UCMEO 93001 31208
1700/
31207 61300 81742 0002/ 360// 233// 40728
31207 ///// ///// ///// ///// /////
99999
PLAIN
SOHO/LASCO HALO CME December 7, 2023
C2 Start Time: 12:48 - 13:36 UT
C3 Start Time: 13:42 - 13:54 UT
Type of CME:
Asymmetric HALO CME — BACKSIDE
pa1: 000 pa2: 360
Total Width: 360 degrees
Velocity Measurements:
C2: 3 points 813.1 km/sec @ PA 267.50
C3: 12 points 716.7 km/sec @ PA 267.79
Average through both(C2/C3) fields: 728.8 km/sec
Acceleration: -23.73 m/sec^2
COMMENT:
LASCO C2/C3 show an asymmetric halo emerging in all directions
with a bright leading edge to the W. In LASCO C2 imagery a bright core
can be seen emerging from the W as as the halo begins at approximately
13:36 UT. Due to no source being seen on the frontside, the source is
likely a backsided eruption with evidence of field line movement beyond
the NW limb seen in SDO AIA 171 imagery beginning at 13:00 UT.
STEREO
Beacon Data COR2 A, shows a faint
asymetric halo emerging from all
directions, between 13:23 - 13:53UT. The halo propagates outward
in all directions skewed towards the west. Preliminary time/height
measurements gives
a velocity of 749.2 km/sec @ PA 227.50 using 6 points of
measurement.
Preliminary UCMEO velocity and position measurements are delivered
first.
Images, movies, and time/height information for this event will be
available at:
https://umbra.nascom.nasa.gov/lasco/observations/halo/2023/231207
Best Regards,
--James Tabourne
BT
[Images from original message are omitted here]
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