SOHO/LASCO Halo CME 20260510

Halo Alert: halo-message.20260510

UCMEO 93001 60512 1650/
60510 61348 81706 2841/ 153// 333// 41488
60510 61318 81357 16521 14436 1112/
99999

PLAIN

SOHO/LASCO HALO CME May 10, 2026

C2 Start Time:     13:48 UT

C3 Start Time:        13:54 - 17:06 UT

Type of CME:
Partial HALO CME — FRONTSIDE
pa1: 284      pa2: 153       Total Width: 229 degrees

Velocity Measurements:

C2    2 points    1679.7 km/sec @ PA 066
C3    9 points    1470.5 km/sec @ PA 066
Average through both fields:     1488.3 km/sec Acceleration: -21.82 m/sec^2.

COMMENT: SDO AIA 193A shows a flare of AR14436 beginning 13:18 - 13:57 UT
    at location [N21, E65] over the East hemisphere. The event produces
    a EUV wave centered in the north East and a dimming of the region
    southward. A post coronal loop arcade follows.

     LASCO C2/C3 shows an asymetric Partial HALO CME over the North and East.

     STEREO Beacon Data
     COR2 A, shows an asymetric HALO CME over the North and East 12:38 - 15:38 UT.
     Preliminary time/height measure shows 4 points - 1665.2 km/sec @64 deg.


NOAA/GOES reports an M5.7 class X-ray flare of AR14436 13:19/13:39/14:02 UT

Preliminary UCMEO velocity and position measurements are delivered first.
Images, movies, and time/height information for this event will available at:

https://umbra.nascom.nasa.gov/lasco/observations/halo/2026/260510/

Best Regards,

--Kevin Schenk

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-CCOR-1	SDO/AIA 193 Angstroms Diff	STEREO/COR2 AHEAD Diff

SOHO/LASCO C2	SOHO/LASCO C3	SDO AIA 171 Angstrom