UCMEO 93001 30808 1530/
30807 62048 80000 0501/ 125// 233// 41874
30807 62030 82104 41288 13386 1112/
99999

PLAIN


SOHO/LASCO  HALO CME August 7, 2023 

C2 Start Time: 20:48 UT

C3 Start Time: 21:18 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  050     pa2:  125       Total Width:  285 degrees

Velocity Measurements:

C2:    1 point     *** km/sec @ PA 294
C3:    8 points   1844.2 km/sec @ PA 294.48
Average through both(C2/C3) fields:  1874.1 km/sec  Acceleration: -17.04 m/sec^2

COMMENT:  LASCO C2/C3 show a fast moving partial halo CME emerging from the west. The CME starts bright then fades into a faint leading edge that propagates westward, with no presence in the east. The event is associated with a X1.5 class solar flare centered on N12W88 (AR 3386), the flare is accompanied by an EUV wave and post-eruptive arcades.

NOAA/GOES reports a X1.5 flare from AR 3386 20:30/20:46/21:04 UT

STEREO Beacon Data
COR2 A, Preliminary time/height measure can not be given at this time due to data gap 19:23 - 4:23 .

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/2023/230807



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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