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:  002      pa2:  180       Total Width:  178 degrees

Velocity Measurements:

C2	11 points	 274.1 km/sec @ PA 112
C3	15 points	 563.2 km/sec @ PA 112  
Average through both fields: 	 470.4 km/sec  Acceleration: 30.15 m/sec^2.   

COMMENT: SDO AIA 304A shows an activated eruptive filament 
	  09:58-13:15 UT centered at location [S45, E18]. 
			
	  STEREO Beacon Data
	  COR2 A, 12:23 - 17:53 UT; shows a loop CME over the SouthWest.
	  Preliminary time/height measure gives 396.6 km/sec @ 222 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/2021/210220/


Best Regards,

--Kevin Schenk

BT