SOHO/LASCO Halo CME 20251109

Halo Alert: halo-message.20251109

UCMEO 93001 51109 2140/
51109 60724 81354 0721/ 071// 123// 40998
51109 60700 80809 10327 14274 1122/
99999

PLAIN

SOHO/LASCO HALO CME November 09, 2025

C2 Start Time:     07:24 UT

C3 Start Time:        08:30 - 13:54 UT

Type of CME:
Near Symetric HALO CME — FRONTSIDE
pa1: 072      pa2: 071       Total Width: 360 degrees

Velocity Measurements:

C2    4 points    1122.8 km/sec @ PA 072
C3    7 points    1185.5 km/sec @ PA 072
Average through both fields:     988.2 km/sec Acceleration: 75.75 m/sec^2.

COMMENT: SDO AIA 193A data shows a long duration flare (LDE) from AR 14274 at
    location [N27, E03] 07:00 - 08:09 UT.
    An eruptive filament [N34, E04] activates 06:06 UT and appears to be associated.
    The flare produces a large loop CME expanding to a near symetric HALO CME.
      A EUV wave is seen propagating across the disk. 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 North East 06:53 - 10:38 UT.
     Preliminary time/height measure shows 8 points - 640.7 km/sec @63 deg.


NOAA/GOES reports a X1.7 class X-ray flare of AR14274 07:01/07:35/07:55 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/2025/251109/

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 195 angstrom

SUVI / GOES19 131A	SDO AIA 195 angstrom Diff	STEREO/COR2 AHEAD Diff

SOHO/LASCO C2	SOHO/LASCO C3	SUVI / GOES-19 304A