UCMEO 93001 70911 1739/
70910 61600 81818 2531/ 252// 333// 33288
70910 61545 81651 38808 12673 1112/
99999

PLAIN


SOHO/LASCO  HALO CME September 10, 2017  

C2 Start Time:   16:00 UT

C3 Start Time: 16:06 - 18:18 UT  

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  253      pa2:  252       Total Width:  360 degrees

Velocity Measurements:

C2 1 points  ****.* km/sec @ PA 253
C3 5 points  3212.4 km/sec @ PA 253 
Average through both fields:   3287.6 km/sec  Acceleration:   

COMMENT:   AIA 193 shows a long duration (LDE) impulsive flare event
		      of AR 12673 at location [S08, W88] beginning 15:45 - 16:51 UT.
		      The event produces an EUV wave and a dimming across the disk, 
		      followed by a post loop arcade.
			
			LASCO shows extreme proton flux in the field of view (SEP).

			STEREO Beacon Data
			COR2 A, in progress 16:24 - 16:40 UT; shows an asymmetric HALO CME
			Preliminary time/height measure gives 2630.4 km/sec @ 110 degrees.
						
NOAA/GOES reports a X8.2 class X-ray flare of AR12673 15:35/16:06/16:31 UT.
NOAA/GOES shows a increases in proton particles with flux >100 MeV
			and surpasses solar storm threshold conditions.
			 		
			
Preliminary UCMEO velocity and position measurements will be delivered first. 
Images, movies, and time/height information for this event will be available at: 

http://umbra.nascom.nasa.gov/lasco/observations/halo/2017/170910/


 Best Regards,

--Nick Padgett



BT