SOHO/LASCO Halo CME 20260108c

Halo Alert: halo-message.20260108c

UCMEO 93001 60109 1815/
60108 61648 81836 1671/ 167// 323// 40682
60108 61618 81730 21903 14334 1112/
99999

PLAIN

SOHO/LASCO HALO CME January 8, 2026

C2 Start Time: 16:48 UT

C3 Start Time: 17:30 – 20:06 UT

Type of CME:
Partial HALO CME — FRONTSIDE
pa1: 167      pa2: 167       Total Width: 360 degrees

Velocity Measurements:

C2 3 points 638.9 km/sec @ PA 167
C3 5 points 677.7 km/sec @ PA 167
Average through both fields: 682.5 km/sec Acceleration: 4.87 m/sec^2.

        COMMENT: A partial HALO event can be seen in LASCO C2/C3 in the Southeast
                  quadrant @ 16:48. As reported by NOAA, the CME is associated with a C5.6
                  class solar flare in AR 14334 [S19,E03]. SolarSoft reports an eruptive C5.5
                  solar flare associated with a long duration event situated in the central meridian
                  that merged with a 2nd NOAA named event C5.7. SDO/AIA 193 shows opening
                  lines associated with the event starting @ 16:18 UT in the Southeast quadrant
                  near the meridian along with dimming, post-eruption arcades and sigmoidal
                  EUV waves.

        STEREO BEACON Data
                 Due to data gaps from 16:23-02:53 UT, Preliminary time/height measurements
                  could not be performed at this 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/2026/260108c/

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