SOHO/LASCO Halo CME 20170906

Halo Alert: halo-message.20170906

UCMEO 93001 70907 1550/
70906 61224 81630 2271/ 226// 333// 41429
70906 61154 81406 33409 12673 1112/
99999

PLAIN

SOHO/LASCO HALO CME September 06, 2017

C2 Start Time:     12:24 UT

C3 Start Time:        12:30 - 16:30 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 227      pa2: 226       Total Width: 360 degrees

Velocity Measurements:

C2    3 points    1286.1 km/sec @ PA 227
C3    7 points    1474.7 km/sec @ PA 227
Average through both fields:     1428.9 km/sec Acceleration:

COMMENT:       AIA 193 shows an impulsive flare of AR 12673 at location [S09, W34]
                            11:54-14:06 UT. The event produces an EUV wave and a dimming
                            across the disk, followed by a post loop arcade.

                            LASCO shows increased proton flux in the field of view (SEP).

                            STEREO Beacon Data
                           COR2 A, 12:24 - 14:24 UT; shows an asymmetric HALO CME
                            Preliminary time/height measure gives 1382.1 km/sec @ 236 degrees.

NOAA/GOES reports a X9.3 class X-ray flare of AR12673 11:53/12:02/12:10 UT.
NOAA/GOES shows an increase in proton particles with an increase in flux >100 MeV.
                         The flux > 10 MeV increases and remains in solar storm 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/2017/170906/

Best Regards,

--Kevin Schenk

BT