SOHO/LASCO Halo CME 20260216

Halo Alert: halo-message.20260216b

UCMEO 93001 60217 2145/
60216 61348 81612 0401/ 040// 113// 20414
60216 61224 81306 21810 ///// 1112/
99999

PLAIN

SOHO/LASCO HALO CME February 16, 2026

C2 Start Time: 13:48 UT

C3 Start Time: 15:04 – 17:54 UT

Type of CME:
Partial HALO CME — FRONTSIDE
pa1: 40      pa2: 40       Total Width: 360 degrees

Velocity Measurements:

C2 3 points 404.6 km/sec @ PA 40
C3 4 points 452.7 km/sec @ PA 40
Average through both fields: 414.4 km/sec Acceleration: 24.53 m/sec^2.

COMMENT: A partial HALO event can be seen in LASCO C2/C3 in the Southeast
    quadrant @ 13:48 UT. As reported by NOAA, the CME is associated
    with a C1.0 class filament eruption situated at [S18,E10]. In addition,
    SolarSoft details an eruptive C1.1 EUV CME. SDO/AIA 193 shows opening
    lines associated with the event starting @ 12:24 UT in the Southeast
    quadrant near the central meridian with dimming post-eruption arcades.

STEREO BEACON Data
    COR2 A shows a faint CME in the Eastern hemisphere.
    Preliminary time/height measure shows 3 points - 706.9 km/sec @ 86.97 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/2026/260216b/

Best Regards,

--Taylor Lanier

BT

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