SOHO/LASCO Halo CME 20260216

Halo Alert: halo-message.20260216

UCMEO 93001 60216 2030/
60216 60424 80736 0752/ 075// 333// 41580
60216 60403 80435 20989 ///// 1122/
99999

PLAIN

SOHO/LASCO HALO CME February 16, 2026

C2 Start Time: 04:24 UT

C3 Start Time: 04:54 – 07:54 UT

Type of CME:
Partial HALO CME — BACKSIDE
pa1: 75      pa2: 75       Total Width: 360 degrees

Velocity Measurements:

C2 3 points 1649.4 km/sec @ PA 75
C3 4 points 1463.2 km/sec @ PA 75
Average through both fields: 1580.9 km/sec Acceleration: -75.14 m/sec^2.

COMMENT: A partial, near full HALO event can be seen in LASCO C2/C3 in the
                       Southeast quadrant @ 04:24 UT. As reported by NOAA, the CME is
                       associated with a M2.4 class solar flare located at [S09,E89].
                       SolarSoft reports an eruptive M2.5 solar flare situated at the
                       Southeast limb with a filament liftoff EUV. SDO/AIA 193 shows
                       opening lines associated with the event starting @ 04:03 UT in the
                       Southeast quadrant near the Eastern limb with post-eruption arcades.

STEREO BEACON Data
                     COR2 A shows a very faint full HALO CME from 04:38-07:23 UT.
                     Preliminary time/height measure shows 3 points - 1249.5 km/sec @ 71.80 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/2026/260216/

Best Regards,

--Taylor Lanier

BT

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SOHO/LASCO C2 Diff	SOHO/LASCO C3 Diff	SUVI 195 Angstrom

GOES-19 CCOR-1	SDO AIA 193 Angstrom Diff	STEREO/COR2 AHEAD Diff

SOHO/LASCO C2	SOHO/LASCO C3	GOES-19 SUVI 191 Angstrom