SOHO/LASCO Halo CME 20171018

Halo Alert: halo-message.20180212

UCMEO 93001 80212 2130/
80212 60125 80818 2561/ 255// 213// 40519
80212 60015 80130 31409 12699 1112/
99999

PLAIN

SOHO/LASCO HALO CME February 12, 2018

C2 Start Time:     01:25 UT

C3 Start Time:        02:06 - 08:18 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 256      pa2: 225       Total Width: 360 degrees

Velocity Measurements:

C2    3 points    0540.7 km/sec @ PA 256
C3    10 points    0507.0 km/sec @ PA 256
Average through both fields:     0518.5 km/sec Acceleration: -9.79 m/sec^2.

COMMENT:       AIA 193 shows a flare of AR 12699 at location [S09, W14]
         00:15-01:30 UT. The event produces an EUV wave and a dimming
        in the Southwest quadrant, followed by a post loop arcade.


    STEREO Beacon Data
    COR2 A, 01:24 - 04:39 UT; shows a CME over the Southwest quadrant.
    Preliminary time/height measure gives 0453.7 km/sec @ 249 degrees.

NOAA/GOES reports a C1.5 class X-ray flare of AR12699 00:15/01:35/03:21 UT.

Preliminary UCMEO velocity and position measurements are delivered first.
Images, movies, and time/height information for this event will be available at:

https://umbra.nascom.nasa.gov/lasco/observations/halo/2018/180212

Best Regards,

--Kevin Schenk

BT

[Images from original message are omitted here]

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