SOHO/LASCO Halo CME 20130514ab

Halo Alert: halo-message.20130514ab

Subject: SOHO/LASCO HALO CME 130514ab

UCMEO 93001 30514 2030/
30514 60124 80418 0702/ 069// 233// 42072
30514 60005 80145 19312 11748 1112/
99999

PLAIN

SOHO/LASCO observed two (2) HALO CMEs in close succession on May 14, 2013.
Event (A) is first seen in C2 at 01:25 UT as a bright loop in progress
at first frame with LE at 5.2Rsun. The front expands with extensions
to a full HALO CME by 02:24 UT. The event continues into the C3
field beginning 01:30 to 04:18 UT leaving the C3 field of view at 30Rsun in
the East hemisphere. The second event (B) begins 02:00 UT with loop
edge over the East. The event expands to a partial HALO 280 degrees in width.

Event (A):
Time/height measurements were marked to 7 points in C3 only, with speeds of 2071.7 Km/sec
with acceleration -45.26 m/sec^2.

Event (B):
Time/height measurements were marked to 4 points in C2 with speeds of 694.3 Km/sec
at position angle 91 degrees. The event is marked to 5 points in C3. Speeds average
through both fields to 996.4 Km/sec at PA 89 degrees. Acceleration 48.18 m/sec^2.

SDO/AIA 193A shows a flare on the East limb at N12 00:09-01:54 and 02:06-02:24 UT.
A dimming and wave is seen over the east hemisphere and North Pole area.

STEREO: BEACON Data
COR2 B, 01:24-02:39 UT, asymmetric HALO over the West.
Preliminary time/height measure gives 1728.6 km/sec velocity at LE.
EUVI B, 00:05-01:55 UT a flare of AR 11748 near the limb in the NW at
location [N12, E93]. A second brightening of the AR is seen 02:05-02:45 UT.
The flare(s) produced a wave and dimming of the West with post arcade.

COR2 A, 15:54-02:54 UT data gap. At 02:54 UT a CME in progress with LE
already out of the field of view.
EUVI A, n/a

NOAA reports a X3.2 class X-ray flare from AR 11748 00:00/01:11/01:20 UT.
This flare appears to be associated with the flare seen on the limb in the East.

The observation of this event is considered 'GOOD'. This CME is determined a
FARSIDE LIMB event.
There is associated material seen on disk in the East hemisphere.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2013/130514ab/

Best regards,

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

BT

SOHO/LASCO C2 Diff (A)	SOHO/LASCO C2 Diff (B)	SOHO/LASCO C3 Diff

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

SDO/AIA 193A	STEREO/EUVI BEHIND	STEREO/EUVI BEHIND

Time/Height Velocities and Plots

C2/C3

Click on Links below for additional information.

Halo Alert: halo-message.20130514ab

MPEG Movies

LASCO Software IDL Save Files (.mvi)