SOHO/LASCO Halo CME 20231109

Halo Alert: halo-message.20231109

UCMEO 93001 31010 1700/
31109 61136 81512 0001/ 360// 113// 30591
31109 61053 81137 31004 13480 1212/
99999

PLAIN

SOHO/LASCO HALO CME November 11, 2023

C2 Start Time: 11:36 UT

C3 Start Time: 12:18 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 000    pa2: 360       Total Width: 360 degrees

Velocity Measurements:

C2:   7 points     592.7 km/sec @ PA 325.73
C3:   11 points   592.9 km/sec @ PA 325.75
Average through both(C2/C3) fields: 591.5 km/sec Acceleration: -1.46 m/sec^2

COMMENT: LASCO C2/C3 show a faint full halo that emerges from the NW at approximately 12 UT. In LASCO C2 imagery the CME emerges from the NW at 11:36 UT with large presence in the W with a faint line propagating in the E direction. The source is associated with a C2.6 flare centered around S10W04 near AR 3480 starting at 10:53 UT. In SDO AIA 193 , 131 imagery a piece of filament can be seen erupting from the region as well as dimming.

NOAA/GOES reports a C2.6 flare from AR 13480 10:53/11:18/11:37 UT

STEREO Beacon Data COR2 A, show a faint full halo emerging from all directions beginning at 12:23UT. Preliminary time/height measurements gives a velocity of 491.8 km/sec @ PA 348.66 using 5 points of measurement.

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/2023/231109

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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