UCMEO 93001 30731 1630/
30728 61612 81824 2001/ 359// 233// 41860
30728 61539 81616 42787 13376 2223/
99999

PLAIN


SOHO/LASCO  HALO CME July 28, 2023 

C2 Start Time:   16:12 UT

C3 Start Time: 16:54 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  200     pa2:  359       Total Width:  159 degrees

Velocity Measurements:

C2 1 points 
C3 9 points  1860.2 km/sec @ PA 291
Average through both fields: 

COMMENT:  LASCO C2/C3 show a fast moving partial-halo CME emerging from the NW with a bright core then propagating westward with a faint leading edge. SDO AIA 171, 193 show a bright eruption of filamentary material centered at location N27W87 starting around 15:46 in AIA 171.

LASCO shows extreme proton flux in the field of view. (SEP)

NOAA/GOES reports a M4.1 flare from AR 3376 15:39/15:58/16:16 UT

STEREO Beacon Data
COR2 A, shows a bright core CME over the West 15:53 - 18:53 UT.
Preliminary time/height measure gives 2188.5 km/sec @ 312 degrees.

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/2023/230728



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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