UCMEO 93001 30807 1750/
30805 62212 80142 0201/ 193// 333// 41670
30805 62145 82240 41177 13386 1112/
99999

PLAIN


SOHO/LASCO  HALO CME August 5, 2023 

C2 Start Time: 22:12 UT

C3 Start Time: 22:30 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  020     pa2:  193       Total Width:  173 degrees

Velocity Measurements:

C2:    3 points   1629.2 km/sec @ PA 285.87
C3:    8 points   1646.8 km/sec @ PA 285.64
Average through both(C2/C3) fields:  1670.1 km/sec  Acceleration: -39.69 m/sec^2

COMMENT:  LASCO C2/C3 show a partial halo CME visible in the west. The CME starts bright but quickly fades into a faint leading edge with cavity and core that propagates westward. The event is associated with a X1.6 class solar flare centered on N11W77 (AR 3386), the flare is accompanied by an EUV wave and post-eruptive arcades.

NOAA/GOES reports a X1.6 flare from AR 3386 21:45/22:21/22:40 UT

STEREO Beacon Data
COR2 A, show only the last few frames of the halo CME as there was a
gap in data when it began 19:38 - 23:53.
Preliminary time/height measure can not be given at this time due to data gap.

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/2023/230805_B



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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