SOHO/LASCO Halo CME 20230911

Halo Alert: halo-message.20230911

UCMEO 93001 30911 1700/
30911 62236 80212 0002/ 360// 233// 41148
30911 ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO HALO CME September 11, 2023

C2 Start Time: 22:36 UT

C3 Start Time: 22:30 - 23:06UT

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

Velocity Measurements:

C2:   2 points 1416.8 km/sec @ PA 30.10
C3:   10 points   1081.9 km/sec @ PA 30.61
Average through both(C2/C3) fields: 1148.5 km/sec Acceleration: -72.76 m/sec^2

COMMENT: LASCO C2/C3 show a bright fast moving full halo CME. In LASCO C2 imagery the CME emerges from the NE at 22:36 UT and wraps around the W into a full halo CME by 23:24 UT.The halo CME's source is a backsided eruption .

STEREO Beacon Data COR2 A, Due to gaps in data from 21:38 - 03:23 UT, STEREO COR2 A data is not available at this time.

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/2023/230911

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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SOHO/LASCO C2 Diff
SOHO/LASCO C3 Diff

SOHO/LASCO C3 SOHO/LASCO C2 STEREO/COR2 BEHIND

STEREO/COR2 AHEAD Diff
STEREO/COR2 AHEAD