SOHO/LASCO Halo CME 20231214

Halo Alert: halo-message.20231207

UCMEO 93001 31215 0500/
31214 61712 82230 0001/ 360// 233// 30969
31214 61647 81712 40453 13514 1112/
99999

PLAIN

SOHO/LASCO HALO CME December 14, 2023

C2 Start Time: 17:00 - 17:12 UT

C3 Start Time: 16:42 - 16:54 UT

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

Velocity Measurements:

C2:   4 points     1063.4 km/sec @ PA 269.42
C3:   16 points   957.2 km/sec @ PA 269.63
Average through both(C2/C3) fields: 969.5 km/sec Acceleration: -6.33 m/sec^2

COMMENT: LASCO C2/C3 show a bright almost symmetrical halo CME. In LASCO C2, the CME emerges from the W starting at 17:00 -17:12 with bright opening lines and core. The CME propagates in all directions with the bulk portion in the west and wraps around the E by 19:00 UT.The halo CMEs source is a X2.8 flare centered on N04W53 (3514). The source is best seen on SDO AIA 171, 131, and 193 with dimming associated with the eruption towards the SE.

NOAA/GOES reports a X2.8 flare from AR 13514 16:47/17:02/17:12 UT

STEREO Beacon Data COR2 A, shows a asymmetric full halo. Due to gaps in data the beginning of the halo CME is not yet available. Beginning at 18:23 UT, the halo CME can be seen from all directions with bright lines though skewed partially towards the W. Preliminary time/height measurements gives a velocity of 909.2 km/sec @ PA 230.52 using 5 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/2023/231214

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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