LASCO Activity Report for
July 7, 2005 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

On 2005/07/06, SOHO Telemetry Submode was changed to Submode 5 (support for
VAULT -Sounding Rocket Launch on 2005/07/07). Telemetry Submode will be
changed back to Submode 6 on 2005/07/08, exact time still to be confirmed.

During TM Submode 5, EIT CME watch in half-res (512x512).

2005/07/06 (Wednesday)

	
00:30 UT  E Limb	Small blob-like feature precedes a bright and ragged
			loop front. It fades throughout C3. Gusty outflow on 
			ENE.  

00:30 UT  W Limb	Slow development of a faint and asymmetric loop front.
			It fades throughout C3.

11:30 UT  WS West	Very faint front. Difficult to give an exact time of
			first appearance. It fades thorughout C3.

21:26 UT  N Pole	Very faint and diffuse wide front. It develops as a
			system of wide and expanding loop fronts, the 
			subsequent expanding fronts mainly appearing above 
			the NNE limb until around 05:26 UT on 07/07. The 
			event is first seen in C3 at 01:42 UT (on 07/07) 
			above the NNE limb. By 09:42 UT, the whole event 
			spans in C3 ~ 200 deg (from PA 275 - 115, though 
			the limit on W is not well defined). The mean plane-
			of-sky speed of the LE at PA 028 was ~ 275 km/sec 
			(based on C3 data). GOES reported multiple C-class
			(impulsive) X-ray activity on NOAA AR 10786 all along
			07/06. In particular, after 17:00 UT we have:
			- a C5.9 (N09E14) peaking at 17:49 UT,
			- a C1.4 (N10E14) peaking at 18:46 UT,
			- a C1.0 (N10E12) peaking at 20:22 UT, and
			- a C1.0 (N09E12) peaking at 21:24 UT.
			EIT 195 images show a relatively strong brightening 
			on AR 10786 at 17:48 UT, and some minor brightenings
			later that roughly match the time of the X-ray spikes.
			Some time after the brightening at 17:48 UT (i.e.,
			starting at ~ 19:48 UT), a slight dimming region can 
			be seen developing rather far to the ESE of AR 10786. 
			In summary, the event has therefore been determined as 
			a Partial Halo Event. However, despite the frontsided
			activity observed, I don't find it conclusive to
			catalog the LASCO event as frontsided. Therefore,  
			there exist the possibility that the event may have 
			been backsided.

2005/07/07 (Thursday)

04:06 UT  EN East	Slow development of a system of loops along streamer.
			The event superposes in the LOS with the Partial Halo
			under development reported to start at 21:26 UT on
			previous day.	

12:06 UT  E Limb	Very faint and diffuse loop front.

Time of the last C2 image analyzed: 12:30 UT.