UCMEO 93001 30717 2140/
30714 61903 82123 0001/ 360// 113// 20700
30714 61834 91923 21612 13370 1224/
99999

PLAIN


SOHO/LASCO  HALO CME July 14, 2023 FRONTSIDE

C2 Start Time:      19:03 UT

C3 Start Time:      ​ ****  

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

Velocity Measurements:

C2:    9 points     700.6 km/sec @ PA 213.31 Acceleration: -76.96 mk/sec^2.
C3:    ***
Average through both(C2/C3) fields:      ​*** 

COMMENT: LASCO C2 shows a very faint halo CME originating in the southern region, then expanding north into a full halo 20:06 UT. The CME is associated with a flare centered on S16E12 (AR 13370) starting around 18:34 UT as seen on SDO AIA 94,131.

NOAA/GOES reports a C8.8 flare from AR 3370 18:18/18:44/19:23 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.
 
STEREO Beacon Data COR2 A, shows the CME very faintly in the SW direction before data gap begins at  20:38 UT. Due to gaps in data, velocity and position measurements could not be completed at the time.         
          
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/2023/230714

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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