SOHO/LASCO Halo CME 20170917 [B]

Halo Alert: halo-message.20170917b

UCMEO 93001 70919 1430/
70917 61424 82130 3362/ 192// 333// 40799
70917 61345 81745 ///// 12673 1112/
99999

PLAIN

SOHO/LASCO Partial HALO CME September 17 2017

C2 Start Time:     14:24 UT

C3 Start Time:        15:06 - 21:30 UT

Type of CME:
Partial HALO CME — BACKSIDE
pa1: 336      pa2: 192      Total Width: 216 degrees

Velocity Measurements:

C2    5 points    786.6 km/sec @ PA 134
C3    8 points    808 km/sec @ PA 134
Average through both fields:     799.8 km/sec @ PA 134 Acceleration: 1.80 m/sec^2

STEREO-A COR2 14:39-16:39 UT Partial HALO seen in COR2.
    3 points 1060 km/sec @ PA 117 Acceleration:

COMMENT:       STEREO AHEAD 195 BEACON data shows a flare on disk from
            AR 12673 at location [S11, E169] at 13:45 - 17:45 UT.
            A dimming and an EUV wave is seen transitioning from
            the AR in the South East quadrant.

Preliminary UCMEO velocity and position measurements will be delivered first.
Images, movies, and time/height information for this event will be available at:
https://umbra.nascom.nasa.gov/lasco/observations/halo/2017/170917b/

Best Regards

—Nick Padgett

BT

[Images from original message are omitted here]

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