UCMEO 93001 11101 1800/
11101 60148 81042 0461/ 314// 333// 40639
11101 60057 80230 34529 12887 1112/
99999

PLAIN


SOHO/LASCO  PARTIAL HALO CME November 01, 2021  

C2 Start Time:  	01:48 UT

C3 Start Time:		02:18 - 10:42 UT   

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  046      pa2:  314       Total Width:  268 degrees

Velocity Measurements:

C2	6 points	 0639.0 km/sec @ PA 242
C3	9 points	 0606.2 km/sec @ PA 242  
Average through both fields: 	 0638.7 km/sec  Acceleration: -8.90 m/sec^2.   

COMMENT:   	AIA 193 shows a long duration flare of AR 12887 at location [S29, W45] 
			00:57-02:30 UT.  The event produces a dimming in the West South
			West along with an EUV wave followed by a bright post loop arcade.  
		

			STEREO Beacon Data - Data Gap: 00:00 - 03:38 UT
			COR2 A, shows a CME in progress from the South West.
			Preliminary time/height measure gives 0577.4 km/sec @ 251 degrees.
						
NOAA/GOES reports a M1.5 class X-ray flare of AR12887 00:57/01:45/02:10 UT.		
			
There is increased SEP (Solar Energetic Particle) seen in the LASCO images.  

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/2021/211101/


Best Regards,

--Kevin Schenk

BT

[Images from the original alert message are omitted here]