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PLAIN  


SOHO/LASCO  HALO CME May 8, 2024

C2 Start Time:  5:24 - 5:36 UT

C3 Start Time:  5:54 - 6:06 UT

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

Velocity Measurements:

C2:   7 points    484.4 km/sec @ PA 170.63
C3:   14 points  474.6 km/sec @ PA 170.47
Average through both(C2/C3) fields:  496.1 km/sec  Acceleration: -17.34 m/sec^2

COMMENT:  LASCO C2/C3 shows a full halo CME emerging from all directions faintly with a bright leading edge and core in the W. The CME overlaps with a prior CME in the SW which is associated with a flare from the same active region 3664 with a GOES Class rating of M3.6. The halo CME is associated with a large eruption from AR 3664. The eruption included two flares best seen in SDO AIA 131, the prior M3.5 flare followed by the long duration X1.0 flare which resulted in the full halo CME.

NOAA/GOES reports a X1.0 flare from S22W11 (AR 3664)  04:37/05:09/05:28 UT

STEREO Beacon Data COR2 A, preliminary time/height measurements gives a velocity of 547.3 km/sec at a PA of 162.66. Stereo COR2-A shows a bright full hallo CME emerging from all directions with a bright leading edge in the S.

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/2024/240508



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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