LASCO Activity Report for
August 1, 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

2005/07/29 (Friday)

07:30 UT  SS West	Very faint and diffuse front.

12:06 UT  E Limb	In the gusty outflow, a diffuse and ragged front 
			develops as an asymmetric loop front (brighter to N).
			It fades througout C3.

17:54 UT  SS West	Slow development of a system of faint loop fronts well
			into next day.

18:30 UT  EN East	In the gusty ourflow, a just=appearing brightening
			develops as a not-weel-defined and narrow front (seen 
			in C3 as gusty outflow). GOES reported an impulsive 
			C3.4 X-ray flare on NOAA AR 10792 (N12E69) between 
			17:23 - 17:39 UT with peak emission at 17:32 UT.

20:30 UT  NN West	Extremely faint and diffuse front that fades throughout
			C2.

2005/07/30 (Saturday)

05:57 UT  EN East	Bright loop front just appearing. See next event for
			further details.

06:50 UT  EN East	Big and very bright loop front all above the E-ENE limb,
			almost reaching the end of the C2 FOV, surrounded by
			faint and diffuse extensions that cover the N and S
			Poles. Note that an earlier brightening can already be
			seen on ENE, more precisely at 05:57 UT (more details 
			at the end). The diffuse extensions cover completely 
			the C2 occulting disk by 07:12 UT. Much gusty outflow 
			all above the E Limb afterward. Deflected structures 
			can be seen also by 07:12 UT on SSW. The event is first
			seen in C3 at 07:00 UT on ENE, with the faint extensions
			covering the N and S poles. The bulk of the CME develops
			toward E-ENE. The C3 occulting disk is covered by the
			diffuse extensions by 07:33 UT (signal just above the
			limb on the western hemisphere). The mean plane-of-sky
			speed of the LE of the outermost front of the event at
			several PA is given below (based on C3 data):
			. PA 042: 1620 km/sec
			. PA 075: 1870 km/sec
			. PA 161: 1150 km/sec
			GOES reported a couple of X-ray flares on NOAA AR 10792
			by the time. In particular:
			- a C9.4 X-ray flare (on N11E53) between 05:03 - 05:36 
			UT with peak emission at 05:19 UT, and
			- an X1.3 X-ray flare (on N12E60) between 06:17 - 07:01
			UT with peak emission at 06:35 UT.
			EIT 195 images show a brightening on AR 10792 by 05:19 
			UT followed by a dimming. A much strong brightening on
			the same AR is then seen at 06:44 UT followed by an
			intensity disturbance that extend all across the disk, 
			as well as all above the eastern limb. Therefore, the
		 	brightening first seen in C2 at 05:57 UT is most likely 
			associated to the C9.4 flare, while the X1.3 X-ray 
			flare would be the one associated with the big loop 
			front (06:50 UT) that quickly surpassed the previous
			event and then develops as a full halo. In summary, the
			event has therefore been determined as an asymmetric
			full halo event, frontsided, associated with an X1.3
			X-ray flare on NOAA AR 10792.

17:14 UT  EN East	Very small brghtening just appearing develops as a
			brigh ragged loop front. GOES reported a C8.9 X-ray 
			flare on NOAA AR 10792 (N12E58) between 16:39 - 17:37 UT
			with peak emission at 17:07 UT. Gusty outflow continues.

2005/07/31 (Sunday)

06:06 UT  S West	Very faint loop front. A small ragged front a little 
			bit to S can be seen developing later. They fade 
			throughout C3.

06:06 UT  ES East	Elongated and very diffuse front precedes the development
			of a bright loop front at 06:30 UT.

14:30 UT  E Limb	Diffuse and asymmetric loop front. GOES reported an
			impulsive M1.1 X-ray flare on NOAA AR 10792 (N13E45)
			between 12:15 - 12:33 UT with peak emission at 12:24 UT.

20:30 UT  E Limb	Narrow front in the trailing materila of previous
			event.

2005/08/01 (Monday)

Time of the last C2 image under analyis: 11:06 UT.