Subject: SOHO/LASCO Partial HALO CME 091216

UCMEO 93001 91216 2228/
91216 60406 90942 3401/ 120// 112// 40225
91216 60113 80224 43005 11035 1112/ 
99999

PLAIN

SOHO/LASCO C2 observed a wide loop front over the northern hemisphere on
December 16, 2009 04:06 UT.  The approximate position angle range of 340 -
120 degrees.  At this time SOHO is in an inverted roll position so there
is conflict to the edge where it falls behind the pylons in the NW. The
event continues into the C3 field and measured in the last frame at the
time of this writing of 09:42.

Time/height measurements were marked and calculated to velocities of this
event of 225.2 Km/sec at position angle 42 degrees.

The event propagated from AR 11035 at N30W05 as seen in EIT with a flare
from the region at 01:13-02:24 UT.  An EIT wave is produced at all angles
with a north eastern projection but possibly including AR 11034 which is
adjacent of the epicenter to the south.

GOES shows a C5.4 xray flare at 01:02-01:35 UT claiming AR 11035.  This
flare is most probably associated with the flare and CME observed in the
EIT and LASCO fields.

LASCO and EIT images, movies and time/height information for this event is
available on the web at: 

http://umbra.nascom.nasa.gov/lasco/observations/halo/2009/091216/

Best regards,

Kevin Schenk
SOHO Mission
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT