Subject: SOHO/LASCO Partial HALO CME 120517a
UCMEO 93001 20517 1800/
20517 60148 80530 1701/ 011// 333// 31618
20517 60127 80239 47611 11476 1112/
99999
PLAIN
SOHO/LASCO observed partial HALO CME on May 17, 2012. Event is first
seen in C2 at 01:48 UT as a bright loop with cavity and core in the West.
The approximate width of the CME spans pa 170-11 degrees totaling 201
degrees wide. The event continues into the C3 field beginning 01:54 to
05:30 UT where it leaves the field at 30 Rsun.
Increased proton emission is seen in the lasco white light images.
Time/height measurements were marked to 2 points in C2.
The event is marked to 9 points in C3. Speeds average through both fields
to 1617.9 Km/sec at PA 270 degrees. Acceleration -46.98 m/sec^2.
SDO/AIA 193 shows a long duration flare of AR 11476 located at [N11,W76]
beginning 01:27-02:39 UT. The event produces a wave across the west hemisphere
and dimming southward.
AIA 304 shows an eruptive filament beginning after the flare 02:36-03:12 UT
coming near AR from behind limb.
STEREO: Beacon data
COR2 A, 20:54-02:24 UT data gap. 02:24 UT first frame partial halo east,LE at 6 Rsun.
Preliminary time/height measure gives 1047.5 km/sec velocity at LE.
EUVI A, 20:45-02:25 UT data gap. 02:25 UT in progress, dimming south and westward
from AR 11476 on disk in NE. Filament at disk center on east edge of large coronal
hole erupts 02:25-03:25 UT with post ribbon.
COR2 B, 20:54-05:24 UT data gap. n/a
EUVI B, 21:05-05:25 UT data gap. n/a
NOAA reports a M5.1 Xray flare of AR 11476 01:25-02:14 UT.
An instant increase in proton flux is shown, particles at >100 MeV peaked above
storm level conditions.
The observation of this event is considered '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/2012/120517a/
Best regards,
Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA
BT
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