SOHO/LASCO Halo CME 20260108a

Halo Alert: halo-message.20260108a

UCMEO 93001 60108 2015/
60108 60548 80724 1451/ 145// 323// 30731
60108 60524 80542 21903 14334 1222/
99999

PLAIN

SOHO/LASCO HALO CME January 8, 2026

C2 Start Time: 05:48 UT

C3 Start Time: 6:30 – 8:30 UT

Type of CME:
Partial HALO CME — FRONTSIDE
pa1: 145 pa2: 145 Total Width: 360 degrees

Velocity Measurements:

C2 3 points 740.4 km/sec @ PA 145
C3 4 points 765.5 km/sec @ PA 145
Average through both fields: 731.3 km/sec Acceleration: 30.57 m/sec^2.

COMMENT: A partial HALO event can be seen in LASCO C2/C3 in the Southeast
quadrant @ 05:48. The CME is associated with a C4.4 class solar flare in
AR 14334 [S19,E03] as reported by NOAA. Opening lines associated with the
CME can be viewed in SDO/AIA 193 starting @ 05:24 UT in the Southeast
quadrant.

STEREO BEACON Data
COR2-A shows a narrow CME situated in the Southeast quadrant @ 05:53 UT.
Preliminary time/height measure shows 3 points - 701.8 km/sec @ 149.0 deg.

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/2026/260108a/

Best Regards,

--Taylor Lanier

BT

[Images from the original alert message are omitted here]

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SOHO/LASCO C2 Diff	SOHO/LASCO C3 Diff	SDO AIA 195 angstrom

GOES-19 CCOR1	SDO AIA 195 angstrom Diff	STEREO/COR2 AHEAD Diff

SOHO/LASCO C2	SOHO/LASCO C3	GOES-19 SUVI 195A