SOHO/LASCO Halo CME 20140225

COMMENTS: Asymmetric HALO CME resulting from a X4.9 class X-ray flare of AR 11990 located [S12, E82].
LASCO velocity: 1827.3 km/sec at PA101 degrees. Acceleration: -----

Halo Alert: halo-message.20140225

Subject: SOHO/LASCO HALO CME 140225

UCMEO 93001 40225 1330/
40225 70125 80354 1011/ 100// 31827
40225 60042 80106 28212 11990 1112/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on February 25, 2014. Event is first
seen in C2 at 01:25 UT in progress in first frame with the leading edge
of the CME out of the field of view. The event expands with extensions to
a full halo by 01:48 UT. The event continues into the C3 field beginning 01:30
to 03:54 UT at 30Rsun. Increased proton flux is evident in the Lasco images.

The event is measured in the C3 field at 7 points with speeds od 1827.3 km/sec
at position 101 degrees.

SDO/AIA 193 shows a flare 00:42-01:06 UT at location [S12, E82 ]
from AR11990 near the East limb with emission. A global dimming and wave
is seen across the disk.

STEREO: BEACON Data
COR2 A, 00:00-05:45 UT data gap.
Update: 01:24-03:24 UT. Asymmetric HALO over the West. Increased proton flux.
Preliminary time/height measure gives 2014.3 km/sec velocity at LE.
EUVI A, 00:00-05:30 UT data gap.
COR2 B, 00:55 UT begins a bright loop over the West. Only 1 frame before gap.
Update: 01:24-03:24 UT. Asymmetric Halo over the West. Increased proton flux.
Preliminary time/height measure gives 2047.5 km/sec velocity at LE.
EUVI B, 00:46 shows a flare over the West limb. Only frame before gap.
Update: 00:46-01:11UT. Bright flare from AR over West limb. Dimming and wave
across the West hemisphere.

NOAA reports a X4.9 class Xray flare 00:39/00:49/01:03 UT from AR 11990
at location [S12, E82]. An increase of proton flux is reported >=100 MeV
levels with flux 10 Mev levels at storm conditions.

The observation of this event is 'FAIR'. This CME is determined a FRONTSIDED event.

Images and movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2014/140225/

Best regards,

Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT

SOHO/LASCO C2 Diff
SOHO/LASCO C3 Diff
SDO/AIA 193A

STEREO/COR2 BEHIND
SDO/AIA 193 Diff
STEREO/COR2 AHEAD

STEREO/EUVI BEHIND
STEREO/EUVI BEHIND
SDO/AIA 304A

STEREO/EUVI AHEAD
STEREO/EUVI AHEAD

SOHO/LASCO C2

SOHO/LASCO C3

Time/Height Velocities and Plots

C2/C3

Click on Links below for additional information.

MPEG Movies

LASCO Software IDL Save Files (.mvi)

Please, send questions and comments to Kevin Schenk

SOHO/LASCO C2 Diff	SOHO/LASCO C3 Diff	SDO/AIA 193A

STEREO/COR2 BEHIND	SDO/AIA 193 Diff	STEREO/COR2 AHEAD

STEREO/EUVI BEHIND	STEREO/EUVI BEHIND	SDO/AIA 304A

STEREO/EUVI AHEAD	STEREO/EUVI AHEAD