UCMEO 93001 51029 2355/
51029 60012 80224 0252/ 025// 333// 40963
51029 62342 80015 ///// ///// /////
99999
 
PLAIN
 
 
SOHO/LASCO HALO CME October 29, 2025  
 
C2 Start Time:  00:12 UT
 
C3 Start Time: 00:30 – 03:30 UT   
 
Type of CME:
Partial HALO CME — BACKSIDE
pa1:  25      pa2:  25       Total Width:  360 degrees
 
Velocity Measurements:
 
C2 4 points 1004.8 km/sec @ PA 25
C3 7 points 990.9 km/sec @ PA 25  
Average through both fields:  963.7 km/sec  Acceleration: 
-4.29 m/sec^2.   
 
 
COMMENT: LASCO C2/C3 shows a partial halo found in the NE quadrant starting @ 00:12 UT. 
COR2 A displays the partial halo spread across the Northern hemisphere starting at 
00:38 UT. SDO AIA 193A shows an emission of solar plasma starting @ 23:42 UT along 
with CME-associated opening lines along the NE limb. Additionally, opening lines 
appear in GOES-19 SUVI Composite 195 Angstroms starting @ 23:48, and plasma emission 
can be seen in GOES-19 SUVI Composite 171 Angstroms @ 00:13 UT found near the NE limb.
 
 
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/2025/251029/
 
 
Best Regards,
 
--Taylor Lanier
 
BT