UCMEO 93001 51030 2145/
51030 60424 80648 0452/ 045// 333// 51655
51030 60342 80424 ///// ///// 3112/
99999
 
PLAIN
 
 
SOHO/LASCO HALO CME October 30, 2025  
 
C2 Start Time:  04:24 UT
 
C3 Start Time: 04:54 – 07:24 UT   
 
Type of CME:
Partial HALO CME — BACKSIDE
pa1:  45      pa2:  45       Total Width:  360 degrees
 
Velocity Measurements:
 
C2 4 points 1452.4 km/sec @ PA 45
C3 5 points 1606.5 km/sec @ PA 45  
Average through both fields:  1655.6 km/sec  Acceleration: 
-53.23 m/sec^2.   
 
 
COMMENT: A partial, backside HALO can be seen in LASCO C2/C3 @ 04:24 UT along the Northeast quadrant. This partial HALO event is visible in COR2-A in the Northern hemisphere first appearing @ 04:53 UT. SolarSoft reports the origin of the CME deriving from a prominence eruption behind the Northeast limb N22E88 accompanied by shockwave propagation. The prominence eruption can be seen in GOES-19 SUVI Composite 195 Angstroms with opening lines commencing @ 04:28 UT. The opening lines associated with the prominence eruption begins @ 03:42 UT as shown in SDO AIA 193 near the Northeast 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/2025/251030/
 
 
Best Regards,
 
--Taylor Lanier
 
BT