UCMEO 93001 31129 2300/
31128 62024 80206 0001/ 360// 334// 40519
31128 61907 82007 31603 13500 1112/
99999

PLAIN   


SOHO/LASCO  HALO CME November 28, 2023 

C2 Start Time: 20:24 UT

C3 Start Time: 21:18 - 21:30 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  000    pa2:  360       Total Width:  360 degrees

Velocity Measurements:

C2:   8 points     484.7 km/sec @ PA 203.56
C3:   10 points   533.7 km/sec @ PA 203.63
Average through both(C2/C3) fields:  519.0 km/sec  Acceleration: 10.39 m/sec^2

COMMENT:  LASCO C2/C3 show a slightly asymmetric halo CME. In LASCO C2 imagery the CME emerges from the S slightly in the W direction. The CME has a bright leading edge in the S and propages outwards in all directions.The CME closely overlaps a previous CME that began at 20:12 UT. 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_b



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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