UCMEO 93001 40323 1600/
40323 60125 80718 0001/ 360// 232// 41491
40323 60058 80152 12507 13614 1112/
99999

PLAIN  


SOHO/LASCO  HALO CME March 23, 2024

C2 Start Time:  00:48 - 01:25 UT

C3 Start Time:  01:42 UT

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

Velocity Measurements:

C2:   2 points    1540.5 km/sec @ PA 16.70
C3:   10 points  1466.2 km/sec @ PA 16.68
Average through both(C2/C3) fields:  1491.9 km/sec  Acceleration: -61.78 m/sec^2

COMMENT:  LASCO C2/C3 show a halo CME emerging from the N , with a bright leading edge and core. The CME propagates outwards relatively quickly in all directions before overlapping with a fainter halo CME emerging from the SW, which begins at 2:18 UT.  The CME is associated with a X1.1 class flare centered on N25E07(AR 3614). The flare is accompaanied by a large EUV wave, dimming and post-eruptive arcades seen best in AIA 193.

NOAA/GOES reports a X1.1 flare from S14E15(AR 3615 + 3614)  00:58/01:33/01:52 UT

STEREO Beacon Data COR2 A, due to gaps in data from 03/22/2024 18:23 UT - 03/23/2024  03:23 UT only the end of the halo CME could be captured .Preliminary time/height measurements could not be performed at this time .

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/2024/240323



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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