SOHO/LASCO Halo CME 20241229b

Halo Alert: halo-message.20241229b

UCMEO 93001 41230 1820/
41229 61812 80154 3491/ 206// 123// 40542
41229 61702 81721 22217 13939 1222/
99999

PLAIN

SOHO/LASCO HALO CME December 29, 2024

C2 Start Time: 18:12 UT

C3 Start Time: 18:54 - 01:54 UT

Type of CME:
Partial HALO CME — FRONTSIDE
pa1: 349    pa2: 206      Total Width: 257 degrees

Velocity Measurements:

C2:   8 points    423.8 km/sec @ PA 162
C3:   10 points 580.2 km/sec @ PA 162
Average through both(C2/C3) fields: 542.3 km/sec Acceleration: 23.51 m/sec^2

COMMENT:      SUVI 195A & 131A data shows a flare from AR 13939
               at location [S17, E22] 17:02 - 17:21 UT followed by a post loop arcade.

              LASCO C2/C3 shows partial halo CME across the East hemisphere.

            STEREO Beacon Data
            COR2 A, shows a loop CME over the East in progress at first frame 19:38 - 22:53 UT.
            Preliminary time/height measure gives 703.4 km/sec @ PA 125.0 degrees.

NOAA/GOES reports a M3.3 class X-ray flare from AR 13939 16:56/17:08/17:20 UT

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/2024/241229b/

Best Regards,

--Kevin Schenk

BT
[Images from original message are omitted here]

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SOHO/LASCO C2 Diff
SOHO/LASCO C3 Diff
SUVI 131 angstrom

STEREO/COR2 BEHIND Diff SUVI 195 angstrom STEREO/COR2 AHEAD Diff

SOHO/LASCO C2 SOHO/LASCO C3