SOHO/LASCO Halo CME 20210220

Halo Alert: halo-message.20210220

UCMEO 93001 10221 1415/
10220 61124 82206 0021/ 180// 123// 40470
10220 60958 81315 21845 ///// 2222/
99999

PLAIN

SOHO/LASCO HALO CME February 20, 2021

C2 Start Time:   11:24 UT

C3 Start Time: 13:30 - 22:06 UT

Type of CME:
Asymmetric Partial HALO CME — FRONTSIDE
pa1: 02      pa2: 180       Total Width: 178 degrees

Velocity Measurements:

C2 11 points 274.1 km/sec @ PA 112 degrees
C3 15 points 563.2 km/sec @ PA 112 degrees
Average through both fields:   486.4 km/sec Acceleration: 30.15

COMMENT: SDO AIA 304A shows an activated eruptive filament
                       09:58-13:15 UT centered at location [S45, E18].


    STEREO Beacon Data
                      COR2 A shows a loop event over the South West 12:23-17:53 UT.
                    Preliminary time/height measure gives 396.6 km/sec @ 222 degrees.

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

https://umbra.nascom.nasa.gov/lasco/observations/halo/2021/210220/

Best Regards,

--Kevin Schenk

BT

[Images from original message are omitted here]

________________________________________________
Soho-halo-alert mailing list
Soho-halo-alert@mail.nascom.nasa.gov
https://mail.nascom.nasa.gov/mailman/listinfo/soho-halo-alert