SOHO/LASCO Halo CME 20170917 [A]

Halo Alert: halo-message.20170917a

UCMEO 93001 70918 1920/
70917 61200 81506 0742/ 073// 333// 41436
70917 61135 81255 ///// 12673 1112/
99999

PLAIN

SOHO/LASCO HALO CME September 17 2017

C2 Start Time:     12:00 UT

C3 Start Time:        12:18 - 15:06 UT

Type of CME:
Symmetric HALO CME — BACKSIDE
pa1: 74      pa2: 73       Total Width: 360 degrees

Velocity Measurements:

C2    3 points    1599 km/sec @ PA 74
C3    8 points    1408.4 km/sec @ PA 74
Average through both fields:     1436 km/sec @ PA 74 Acceleration: -33.11 m/sec^2

STEREO-A COR2 12:24-14:24 UT Full HALO seen in COR2.
    04 points 1423.5 km/sec @ PA 95 Acceleration:

COMMENT:       STEREO AHEAD 195 BEACON data shows a flare on disk from
            AR 12673 at location [S11, E169] at 11:35 - 12:55 UT.
            A dimming and an EUV wave is seen transitioning from
            the East across the disk.

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/2017/170917/

Best Regards

—Nick Padgett

BT

[Images from original message are omitted here]

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