SOHO/LASCO Halo CME 20230620

Halo Alert: halo-message.20230620

UCMEO 93001 30621 1757/
30620 61712 82112 3521/ 200// 232// 40636
30620 61642 81735 21773 13341 1212/
99999

PLAIN

SOHO/LASCO HALO CME June 20, 2023 FRONTSIDE

C2 Start Time:      17:12 UT

C3 Start Time:      17:42 UT

Type of CME:
Assymmetric HALO CME — FRONTSIDE
pa1: 352      pa2: 200       Total Width: 208 degrees

Velocity Measurements:

C2:    4 points     1046.4 km/sec @ PA 95.00
C3:    16 points   620.1 km/sec @ PA 95.40
STEREO COR-2: 8 points 636.6 km/s @ PA: 113.44

Average through both(C2/C3) fields:      662.7 km/sec Acceleration: -27.53 m/sec^2.

COMMENT: LASCO C2/C3 shows a bright leading edge with core moving in the SE direction propagating into a partial HALO CME.

The partial-Halo is associated with a flare of GOES Class X1.1 (AR 13341) centered at location [S15, E65] followed by dimming in the NW direction. A post-erupt arcade follows the CME.

STEREO Beacon Data COR2 A, shows the CME in the SE direction starting at 17:23 UT. Preliminary time/height measurements gives a velocity of 636.6 km/sec @ PA 113.44 using 8 points of measurement.

Preliminary UCMEO velocity and position measurements will be delivered first.

Best Regards,

--James Tabourne

BT

[Images from original message are omitted here]

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