UCMEO 93001 40209
2130/
40209 61335 81742 0001/ 360// 233// 32327
40209 61253 81331 33785 13575 1212/
99999
PLAIN
SOHO/LASCO HALO CME February 9, 2024
C2 Start Time: 12:48 - 13:25 UT
C3 Start Time: 12:54 - 13:42 UT
Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 000 pa2: 360
Total Width: 360 degrees
Velocity Measurements:
C2: 1 points **** km/sec @ PA 227
C3: 6 points 2144.6 km/sec @ PA 227.47
Average through both(C2/C3) fields: 2327.7 km/sec
Acceleration: **** m/sec^2
COMMENT: LASCO C2/C3 show a quick moving full halo CME. The halo
CME emerges
from the SW with bright opening lines that quickly fade away while the
core propagates outwards. The CME wraps around to the NW by 15:18 into
a full halo best seen in C3. Due to the rapid expulsion of the CME only
1 point of measurement could be made from C2. The
halo CME is the result of a X3.4 flare
centered around S37W85(AR 3575) accompanied by an eruption of
filamentary material seen best in SDO AIA 171. The flare is followed by
an EUV wave and post-eruptive arcades.
LASCO shows extreme proton flux in the field of view. (SEP)
NOAA/GOES reports a X3.4 flare from AR 13575 12:53/13:14/13:31 UT
STEREO
Beacon Data COR2 A, Preliminary time/height
at 2 points of measurement gives a velocity of 1495.8 km/s @PA 227.20.
STEREO COR2A shows a halo CME emerging from the SW beginning at
approximately 13:38 UT. The halo CME propagates outwards with bulk
portion toward the SW while simulataneouly wrapping around to the N and
W.
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/2024/240209
Best Regards,
--James Tabourne
BT
[Images from original message are omitted here]
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