SOHO/LASCO Halo CME 20260108b

Halo Alert: halo-message.20260108b

UCMEO 93001 60109 0100/
60108 61036 81200 0172/ 017// 323// 30787
60108 61039 81039 ///// ///// /////
99999

PLAIN

SOHO/LASCO HALO CME January 8, 2026

C2 Start Time: 10:36 UT

C3 Start Time: 11:06 – 13:30 UT

Type of CME:
Full HALO CME — BACKSIDE
pa1: 17      pa2: 17       Total Width: 360 degrees

Velocity Measurements:

C2 3 points 678.7 km/sec @ PA 17
C3 5 points 667.1 km/sec @ PA 17
Average through both fields: 787.2 km/sec Acceleration: 49.36 m/sec^2.

COMMENT: An asymmetric full HALO event can be seen in LASCO C2/C3 in the Southeast quadrant @ 10:36 UT. SDO/AIA 193 shows faint opening lines near the Southeast hemisphere starting @ 10:39 UT with an event occurring near the Eastern limb on the backside.

STEREO BEACON Data
COR2-A shows an asymmetric, full CME located in the Southwestern quadrant starting @ 10:23 UT. Preliminary time/height measure shows 4 points - 846.7 km/sec @ 14.73 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/2026/260108b/

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 193 Angstrom

GOES-19 CCOR1	SDO/AIA 193 Angstroms	STEREO/COR2 AHEAD

SOHO/LASCO C2	SOHO/LASCO C3	GOES-19 SUVI 131 Angstrom