UCMEO 93001 11009 1630/
11009 60742 91254 2971/ 296// 123// 40857
11009 60618 80658 10818 12882 1112/
99999

PLAIN


SOHO/LASCO  HALO CME October 09, 2021  

C2 Start Time:  	07:12 UT

C3 Start Time:		07:42 - 12:54 UT (in progress)   

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  297      pa2:  296       Total Width:  360 degrees

Velocity Measurements:

C2	3 points	 0716.5 km/sec @ PA 300
C3	9 points	 0774.9 km/sec @ PA 297  
Average through both fields: 	 0856.9 km/sec  Acceleration: -33.18 m/sec^2.   

COMMENT:   	AIA 193 shows a flare of AR 12882 (long duration) at location [N18, E08] 
			06:18-06:58 UT.  The event produces an EUV wave and a dimming
			toward North and West, followed by a small post loop arcade.  
			

			STEREO Beacon Data
			COR2 A, 07:23 - 09:38 UT; shows a CME from the West.
			Preliminary time/height measure gives 0967.6 km/sec @ 280 degrees.
						
NOAA/GOES reports a M1.6 class X-ray flare of AR12882 06:19/06:38/06:53 UT.		
			
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/2021/211009/


Best Regards,

--Kevin Schenk

BT

[Images from the original alert message are omitted here]