SOHO/LASCO Halo CME 20180503

Halo Alert: halo-message.20180503

UCMEO 93001 805104 1930/
80503 61700 80542 0832/ 082// 323// 40468
80503 61558 81638 ///// 12706 1112/
99999

PLAIN

SOHO/LASCO HALO CME May 03, 2018

C2 Start Time:   17:00 UT

C3 Start Time: 17:42 - 05:42 UT

Type of CME:
Asymmetric HALO CME — BACKSIDE
pa1: 83      pa2: 82       Total Width: 360 degrees

Velocity Measurements:

C2 5 points 680.4 km/sec @ PA 83 degrees
C3 10 points 464.1 km/sec @ PA 84 degrees
Average through both fields:   486.4 km/sec Acceleration: -17.94

COMMENT: STEREO Ahead EUVI 195 shows a flare of AR12706
                       at 15:58-16:38 UT centered at location [N03, E155].
                       The event produces an EUV wave and a dimming over the
                       East hemisphere, followed by a post loop arcade.

    STEREO Beacon Data
                      COR2 A shows a loop event over the East 17:24-21:24 UT.
                    Preliminary time/height measure gives 594.8 km/sec @ 85 degrees.

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/2018/180503/

Best Regards,

--Kevin Schenk

BT

[Images from original message are omitted here]

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