SOHO/LASCO Halo CME 20230807

Halo Alert: halo-message.20230901

UCMEO 93001 30901 2130/
30901 60323 80718 0421/ 165// 233// 21242
30901 60254 80447 41473 13413 2222/
99999

PLAIN

SOHO/LASCO HALO CME September 1, 2023

C2 Start Time: 2:48 - 4:17 UT

C3 Start Time: 3:30 - 4:22UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 42     pa2: 165       Total Width: 237 degrees

Velocity Measurements:

C2:    * points    *** km/sec @ PA ***
C3:   6 points   1242.2 km/sec @ PA 281.42
Average through both(C2/C3) fields: *** km/sec Acceleration: *** m/sec^2

COMMENT: LASCO C2/C3 show a fast moving bright partial halo CME originating in the NW direction. Due to degraded images and the quick movement of the CME, the speed for C2 could not be delivered at this time. The CME is associated with a solar flare centered on N14W73 (AR 13413).

LASCO shows extreme proton flux in the field of view. (SEP)

NOAA/GOES reports a M1.2 flare from AR 13413 02:54/03:51/04:47 UT

STEREO Beacon Data COR2 A, shows a bright partial halo CME in the NW direction beginning at 3:23 UT. Preliminary time/height measurements gives a velocity of 1449.2 km/sec @ PA 285.30 using 4 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/2023/230901

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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