LASCO Activity Report for
December 13, 2006 SOHO Science Daily Meeting

Event times are first frame seen in C2 camera unless otherwise noted.
These are preliminary observations for the daily SOHO science discussions.
Final analysis is reported on the Lasco CME list.
An archive of these reports is available.

Points Of Interest

2006/12/12 (Tuesday)

13:12 UT  S East	Elongated feature. It fades throughout C3.

20:28 UT  SS West	Faint and diffuse ragged front followed at 21:28 UT
			by another one, brighter.

2006/12/13 (Wednesday)

00:54 UT  SS West	Another ragged front quickly surpassed by the 
			following event.

02:54 UT  S Pole	Very bright and wide loop front all above the S Pole,
 			preceded by a diffuse front that fully surrounds the
			occulting disk (signal barely above the limb on N,
 			almost at the end of the C2 FOV on the S). An increase
 			of cosmic rays (proton storm) starts to be observed at
 			03:06 UT; by 03:34 UT the images are almost fully
 			degraded by the ongoing proton storm. The event is 
			first seen in C3 at 03:18 UT, all above the S Pole. 
			The bulk of the CME heads toward S (as projected onto
 			the plane of the sky). The C3 occulting disk is fully
			surrounded by 03:42 UT. The mean plane-of-sky speed 
			of the LE (as measured at the edge of the brightest 
			part of the LE) at PA ~ 180 deg was ~ 1440 km/sec. If
 			measured at the outermost edge of the event (i.e., 
			that of the diffuse front ahead of the bulk of the 
			CME) the plane-of-sky speed is ~ 1800 km/sec (both
 			determinations based on C2 and only a couple of C3
 			frames - afterward images too degraded by the ongoing
			proton storm -). GOES recorded a X3.4 X-ray flare on
 			NOAA AR 10930 (S06W23) between 02:14 - 02:57 UT with
 			peak emission at 02:40 UT. EIT 195 images show a 
			sudden increase in brightness on AR 10930 by 02:24 UT. 
			A rather circular wave (and dimming) with epicenter 
			on the AR mentioned can be seen afterwards quickly
 			covering the full disk. In summary, the event has
			therefore been determined as a full halo event,
			frontsided.


Last C2 image available by the time of writing: 13:40 UT.