UCMEO 93001 50226 1920/
50224 62112 80154 2602/ 259// 333// 41029
50124 ///// ///// ///// 13990 /////
99999
PLAIN
SOHO/LASCO HALO CME February 24, 2025
C2 Start Time: 21:12 UT
C3 Start Time: 22:06 - 01:54 UT
Type of CME:
Partial HALO CME — BACKSIDE
pa1: 260 pa2: 259 Total Width: 360 degrees
Velocity Measurements:
C2 6 points 483.5 km/sec @ PA 260
C3 13 points 1146.3 km/sec @ PA 260
Average through both fields: 1029.4 km/sec Acceleration: 96.38 m/sec^2.
COMMENT: AIA 193A data show a flare from AR 14000 at location [N16, W30]
20:27-21:07 UT and noted as a M1.5 class X-ray. This event
is part of the larger event to follow. AIA 193A shows an eruption
from the West limb steming from South 13, beginning 21:50-23:32UT.
This produces a large loop CME with cavity and core expanding to
a full HALO CME over the West limb with a post loop arcade surfacing
up over the limb to finish. The determnination is a CME from the
previous AR13990. This eruption produces a SEP event.
GOES reports 02/25 00:20 UT flux of > 10 MeV protons exceeded 10pfu.
SOHO reports 02/25 03:50 UT flux of > 15.8 MeV proton exceedes 10/-1.
LASCO C2/C3 shows an asymetric full HALO CME over the West.
STEREO Beacon Data
COR2 A, beacon data gap 02/24 20:23 - 03:23 UT
NOAA/GOES reports a M1.5 class X-ray flare of AR14000 20:51/21:01/21:09 UT
NOAA/GOES reports a M3.9 class X-ray flare of AR13990 21:50/23:02/00:19 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/2025/250224b/
Best Regards,
--Kevin Schenk
BT
[Images from the original alert message are omitted here]
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