UCMEO 93001 30712 1730/
30711 61924 82324 0001/ 360// 233// 40877
30711 61915 91945 23505 13363 2213/
99999

PLAIN


SOHO/LASCO  HALO CME July 16, 2023 BACKSIDE

C2 Start Time:      4:42 UT

C3 Start Time:      ​ ****

Type of CME:
Symmetric HALO CME — BACKSIDE
pa1: 000      pa2:  360       Total Width:  360 degrees

Velocity Measurements:

C2:    4 points     1888.1 km/sec @ PA 288.58
C3:    ***
Average through both(C2/C3) fields:      ​*** 


COMMENT: SOHO/LASCO C2 shows a bright full halo CME to the west. The event is first seen in C2  as a bright loop to the west starting at 4:42 UT. It then propagates to a full halo cme by 5:52 UT. Due to the STEREO COR2-A flyby earth special observation program, c3 images were reduced to a cadence of once every 3 hours not allowing accurate time/height data to be gathered.

The CME is associated with widely moving/opening field lines beyond NW limb seen best in GOES SUVI 171/284.
 
 STEREO Beacon Data
 COR2 A, shows a bright CME pointed west.
Preliminary time/height measurements gives a velocity @ 1587.1 km/sec @ PA 250.62        
          
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/2023/230716/

Best Regards,

--James Tabourne

BT



[Images from original message are omitted here]

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