UCMEO 93001 31129
1830/
31128 62012 80206 0001/ 360// 334// 30564
31128 61907 82007 31603 13500 1112/
99999
PLAIN
SOHO/LASCO HALO CME November 28, 2023
C2 Start Time: 20:12 UT
C3 Start Time: 20:54 - 21:18 UT
Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 000 pa2: 360
Total Width: 360 degrees
Velocity Measurements:
C2: 6 points 562.4 km/sec @ PA 252.48
C3: 11 points 554.0 km/sec @ PA 252.80
Average through both(C2/C3) fields: 564.3 km/sec
Acceleration: 1.72 m/sec^2
COMMENT:
LASCO C2/C3 show an asymmetric halo CME. In LASCO C2
imagery the CME emerges from the SW at 20:12 UT, propagating westward
with a bright leading edge in the W and faint leading edges in all
directions. The CME propagates westward while being overlapped by
a seperate CME beginning at 20:48 UT in the S. The source is
an eruption centered on S16W03(AR 3500) associated with a M3.4 flare
beginning at 19:07 UT and a M9.8 flare starting at 19:35 UT. The
flares are accompanied by a EUV wave, and dimming best seen in
SDO AIA 193. In SDO AIA 171 ,193 post eruptive arcades can be seen.
NOAA/GOES reports a M3.4 flare from AR 13500 19:07/19:32/19:35 UT
NOAA/GOES reports a M9.8 flare from AR 13500 19:35/19:50/20:07 UT
STEREO
Beacon Data COR2 A, due to gaps in data the beginning of the CME is not
available in COR2 imagery at this time. Preliminary time/height
measurements could not be performed.
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/2023/231128
Best Regards,
--James Tabourne
BT
[Images from original message are omitted here]
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