UCMEO 93001 30724 1820/
30723 61505 82130 0111/ 190// 313// 30680
30723 61412 91447 42927 13376 1221/
99999

PLAIN


SOHO/LASCO  HALO CME July 23, 2023 FRONTSIDE

C2 Start Time:      15:05 UT

C3 Start Time:      ​15:21 UT  

Type of CME:
Assymmetric HALO CME — FRONTSIDE
pa1: 011      pa2:  190       Total Width:  179 degrees

Velocity Measurements:

C2:    4 points      678.9 km/sec @ PA 288.52
C3:  16 points      677.2 km/sec @ PA 288.41      
Average through both(C2/C3) fields:  680.5 km/sec  Acceleration: -4.47 mk/sec^2.

COMMENT: LASCO C2 and STEREO COR2 A both show a faint partial-halo originating in the NW. The CME has a bright core with cavity with a faint leading edge. LASCO C3 provides a better view of the CME as it propagates westward. 

The partial-Halo CME is associated with a flare of GOES Class C5.2 centered around N29W27 (AR 3372) as seen most clearly on SDO AIA 94, and also 193. The flare is followed by post-eruption arcades.

STEREO Beacon Data COR2 A, shows the CME in the NW direction starting at 14:53 UT. Preliminary time/height measurements gives a velocity of 863.9 km/sec @ PA 315.59 using 8 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/2023/230723/

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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