SOHO/LASCO Halo CME 20201207

Halo Alert: halo-message.20201207

UCMEO 93001 01208 0215/
01207 61624 82154 1921/ 191// 123// 41241
01207 61548 81709 30825 12790 1112/
99999

PLAIN

SOHO/LASCO   HALO CME DECEMBER 07, 2020

C2 Start Time:     16:24 UT

C3 Start Time:        16:42 - 21:54 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 192      pa2: 191       Total Width: 360 degrees

Velocity Measurements:

C2    3 points    1125.0 km/sec @ PA 192
C3    9 points    1221.3 km/sec @ PA 192
Average through both fields:     1240.8 km/sec Acceleration: -18.54 m/sec^2.

COMMENT: SDO AIA 193 shows a long duration flare from AR 12790
                       15:48-17:09 UT at location [S25, W08] . The flare produces
                        a dimming of the area and a wave that propagates across the disk.

            STEREO Beacon Data
            COR2 A, 15:54 - 17:54 UT; shows a loop CME over the SouthWest.
            Preliminary time/height measure gives 1537.2 km/sec @ 228 degrees.


Preliminary UCMEO velocity and position measurements are delivered first.
Images, movies, and time/height information for this event will soon be available at:

https://umbra.nascom.nasa.gov/lasco/observations/halo/2020/201207/

Best Regards,

--Kevin Schenk

BT

[Images from original message are omitted here]

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