SOHO/LASCO Halo CME 20240511

Halo Alert: halo-message.20240511

UCMEO 93001 40512 0030/
40511 60124 80506 0001/ 360// 232// 41564
40511 60110 80139 31744 13664 1212/
99999

PLAIN

SOHO/LASCO HALO CME May 11, 2024

C2 Start Time: 01:24 - 01:36 UT

C3 Start Time: 01:42 UT

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

Velocity Measurements:

C2:   2 points 1522.5 km/sec @ PA 294.50
C3:   6 points 1546.2 km/sec @ PA 294.73
Average through both(C2/C3) fields: 1564.9 km/sec Acceleration: -57.12 m/sec^2

COMMENT: LASCO C2/C3 shows a full halo CME emerging from the west with a bright leading edge and core. The halo cme propagates outwards with bulk portion ot the west. The halo is associated with a X5.8 flare centered on S17W44(AR 3664). The flare is accompanied by dimming and an EUV wave seen in SDO AIA 193.

LASCO shows extreme proton flux in the field of view. (SEP)
NOAA/GOES reports a X5.8 flare from S17W44(AR 3664) 01:10/01:23/01:39 UT

STEREO Beacon Data COR2 A, preliminary time/height measurements gives a velocity of 1168.7 km/sec at a PA of 261.40. Stereo COR2A shows a halo cme emerging from all sides with a bright leading edge in the west.

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/2024/240511

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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