UCMEO 93001 11102 1922/
11102 60248 80654 0181/ 017// 333// 41629
11102 60136 80339 10114 12891 1112/
99999

PLAIN


SOHO/LASCO  HALO CME November 02, 2021  

C2 Start Time:  	02:48 UT

C3 Start Time:		03:06 - 06:54 UT   

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  018      pa2:  017       Total Width:  360 degrees

Velocity Measurements:

C2	3 points	 1074.8 km/sec @ PA 018
C3	9 points	 1548.6 km/sec @ PA 018  
Average through both fields: 	 1629.4 km/sec  Acceleration: -38.43 m/sec^2.   

COMMENT:   	AIA 193 shows a flare of AR 12891 at location [N14, E01] 02:45-03:39 UT.
			This event produces a dimming across the disk with an EUV wave
			followed by a bright post loop arcade. 
		AIA 304 shows a cooler loop elevated at approximately 00:39 UT and ribbon
			flaring of the filament adjacent and East of AR 12891 beginning 
			01:36 UT.  This emission is part of the CME seen in LASCO. 
		

			STEREO Beacon Data - Data Gap: 00:38 - 03:38 UT
			COR2 A, shows a CME in progress over the West.
			Preliminary time/height measure gives 0521.7 km/sec @ 318 degrees.
						
NOAA/GOES reports a M1.7 class X-ray flare of AR12891 01:20/03:01/03:50 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/2021/211102/


Best Regards,

--Kevin Schenk

BT

[Images from the original alert message are omitted here]