SOHO/LASCO Halo CME 20130522a

COMMENTS: Partial HALO CME results of an eruption located [N13, W61], East of AR 11745
LASCO velocity: 595.3 km/sec at PA303 degrees. Acceleration: 20.41

Halo Alert: halo-message.20130522a

SOHO/LASCO Partial HALO CME 130522a

UCMEO 93001 30523 1450/
30522 60912 81554 1891/ 015// 233// 40595
30522 60645 81033 46113 11745 3112/
99999

PLAIN

SOHO/LASCO observed two (2) halo CMEs on May 22, 2013. The first event
(A) is seen in C2 beginning 09:12 UT with a bright loop with cavity and
core over the West. The event expands with extensions PA 189 - 15 for
a total width of 186 degrees wide. The event continues into the C3
field beginning 09:54-15:54 UT where it leaves the field of view in the
West.

Time/height measurements were marked at 7 points in C2 with speeds of
519.5 Km/sec at pa 303 degrees. The event is marked to 13 points in C3.
Speeds average through both fields to 595.3 Km/sec at PA 303 degrees.
Acceleration 20.41 m/sec^2.

SDO AIA 193 shows an eruption of an area at location [N13, W61] East of
AR 11745. This eruption produces a dimming around the area and a wave
of material in the NW quadrant and across NCH.
304A shows flaring on disk East of AR 11745 and darkening across the
location of the eruption.

STEREO: BEACON data
COR2 A, 08:54-12:24 UT Bright expanding loop over the NE producing
an asymmetric halo.
Preliminary time/height measure gives 705.1 km/sec velocity at LE.
EUVI A 195, 07:25-09:25 UT a CME over the East limb with wave along
the limb in the NE quadrant. A post arcade follows.
COR2 B, 09:54-13:54 UT, a partial halo over the East.
Preliminary time/height measure gives 688.4 km/sec velocity at LE.
EUVI B 195, n/a

The observation of this event is considered 'GOOD'. This CME is determined FRONTSIDED.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2013/130522a/

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 193A Diff
STEREO/COR2 AHEAD

SDO/AIA 304A
STEREO/EUVI AHEAD
STEREO/EUVI AHEAD