SOHO/LASCO Halo CME 20260330

Halo Alert: halo-message.20260330

UCMEO 93001 60330 1658/
60330 60312 80654 1181/ 117// 333// 41718
60330 60225 80436 24527 14405 1112/
99999

PLAIN

SOHO/LASCO HALO CME March 30, 2026

C2 Start Time:     03:12 UT

C3 Start Time:        03:30 - 06:54 UT

Type of CME:
Asymetric HALO CME — FRONTSIDE
pa1: 118      pa2: 117       Total Width: 360 degrees

Velocity Measurements:

C2    3 points    1617.9 km/sec @ PA 118
C3    11 points    1714.0 km/sec @ PA 118
Average through both fields:     1717.8 km/sec Acceleration: -33.68 m/sec^2.

COMMENT: SDO AIA 193A data shows a long duration flare (LDE) from AR 14405 at
                       location [S27, E45] 02:45 - 04:36 UT.
                       The flare produces a large loop CME expanding over the southeast with
                       large scale disturbance along with a dimming in the SE region below the
                       coronal hole. An EUV wave is seen propagating near globaly. The long
                       duration event finishes with post loop arcade.


     LASCO C2/C3 shows an asymetric full HALO CME over the East.

     STEREO Beacon Data
     COR2 A, shows a bright CME over the expanding from the East - In
     progress at first frame 03:38 - 04:30 UT.
     Preliminary time/height measure shows 3 points - 1718.1 km/sec @113 deg.


NOAA/GOES reports a X1.4 class X-ray flare of AR14405 02:47/03:19/03:44 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/2026/260330/

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 Angstrom Diff	STEREO/COR2 AHEAD Diff

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