SOHO/LASCO Halo CME 20190320

Halo Alert: halo-message.20190320

UCMEO 93001 903120 2030/
90320 61148 91618 2161/ 045// 123// 40562
80320 61051 81130 42609 12736 1112/
99999

PLAIN

SOHO/LASCO Partial HALO CME March 20, 2019

C2 Start Time:     1148 UT

C3 Start Time:        12:42 - 16:18 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 216      pa2: 045       Total Width: 189 degrees

Velocity Measurements:

C2    5 points    0554.8 km/sec @ PA 306
C3    4 points    0586.4 km/sec @ PA 306
Average through both fields:     0562.1 km/sec Acceleration: 9.03 m/sec^2.

COMMENT:       AIA 193 shows a flare of AR 12736 at location [N09, W26]
            10:51-11:30 UT. The event produces an EUV wave and a dimming
            in the Northwest quadrant, followed by a small post loop arcade.
            There was an earlier emission in AIA beginning 07:25 UT. It also
            produced minimal EUV wave. There is the possibility of this also
            adding to the CME seen in LASCO.


            STEREO Beacon Data
            COR2 A, 11:39 - 15:39 UT; shows a CME from the West.
            Preliminary time/height measure gives 0620.5 km/sec @ 295 degrees.

NOAA/GOES reports a C4.8 class X-ray flare of AR12736 10:35/11:18/11:34 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/2019/190320/

Best Regards,

--Kevin Schenk

BT

[Images from original message are omitted here]

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