LASCO Activity Report for
July 14, 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

2005/07/13 (Wednesday)

NOTE:
High Activity on NOAA AR 10786 continues. 

02:54 UT  WN West	Bright loop front with inner structure preceded by
			a bright and narrow feature. Some very faint extensions
			to N and S. Gusty outflow continues. GOES reported an
			M1.1 X-ray flare on NOAA AR 10786 (N11W82) between 
			02:35 - 03:47 UT with peak emission at 03:16 UT. It was
			preceded by a C4.2 X-ray flare (N11W77) that peaked at
			01:38 UT.

10:30 UT  SS East	Diffuse jet-like front.

12:54 UT  W Limb	Bright ragged loop front. See next event for more
			details.

14:30 UT  WN West	Very bright loop front that partly superposes in the 
			LOS with a previous bright loop front (which was first
			seen at 12:54 UT). "Our" event develops as a big loop
			front with faint extensions toward N and S (shock). 
			The faint extensions surround completely the C2 
			occulting disk by 15:54 UT. Much gusty outflow then 
			on WNW. "Our" event is first seen in C3 at 14:42 UT,
			just appearing above the WNW Limb, still behind the
			previous front mentioned above. By the time of the 
			next frame (15:18 UT), "our" event already surpasses 
			the previous front. The C3 occulting disk appears to be
			completely covered by 16:42 UT by the faint extensions.
			The mean plane-of-sky of the LE at PA 290 was around
			1360 km/sec (based on C3 data), showing practically no
			acceleration. GOES reported three M-class X-ray flares 
			on NOAA AR 10786 on 2005/07/13 by the time this report
			was written. The first one, an M1.1 (on N11W82) peaking
			at 03:16 UT, was not directly related to the LASCO/EIT
			events under analysis in this report. The other two 
			were: 
			i) an impulsive M3.2 (N08W79) between 12:03 - 12:24 UT,
			peaking at 12:19 UT, and 
			ii) a long duration M5.0 (N11W90) between 14:01 - 15:38
			UT, peaking at 14:49 UT. 
			The M3.2 X-ray flare is most likely associated with 
			the front first seen in C2 at 12:54 UT, while the long
			duration M5.0 X-ray flare is the one associated with
			"our" event (event first seen in C2 at 14:30 UT). EIT 
			195 running difference images show a relatively strong
			brightening starting at 12:12 UT and peaking in next
			frame at 12:24 UT on AR 10786, right on the limb (EIT
			counterpart of the M3.2 X-ray flare). A nice CME
			signature moving outward can be seen afterward. By
			12:48 UT, the expansion of a system of loops apparently
			anchored right behind the limb starts to be seen. The
			expansion becomes suddenly accelerated by the time of 
			a strong brightening starting on AR 10786 at 14:24 UT
			(EIT counterpart of the M5.0 X-ray flare). An important
			intensity disturbance traveling across the disk toward
			East can be seen afterward. In summary, the event has
			therefore been classified as a limb event associated 
			with an M5.0 X-ray flare. Its associated shock made it
			appear as a faint an asymmetric full halo event. Note
			that it is the shock the one which could make the event
			partly geoeffective.

NOTE:
GOES reported an impulsive M1.2 X-ray flare on NOAA AR 10786 (N08W82) between
19:02 - 19:13 UT with peak emission at 19:09 UT. No clear signatures of an
associated CME can be discerned in C2, other than strong gusty outflow by the
time on WSW - WNW.

22:06 UT  W Limb	Diffuse front just appearing. It develops toward WSW 
			as a bright and ragged loop front with faint and diffuse
			loop-like extensions toward N. Gusty outflow then
			continues on WSW - WNW. GOES reported another impulsive
			M1.2 X-ray flare on NOAA AR 10786 (N07W86) between 
			21:49 - 21:58 UT with peak emission at 21:54 UT. At 
			22:00 UT,  EIT 195 images show a brightening on AR 10786
			and a CME signature above the WSW Limb. 

2005/07/14 (Thursday)

00:54 UT  SS East	Diffuse jet-like front.

02:54 UT  WS West	Bright and narrow front with faint loop-like extensions
			toward N. GOES recorded a C3.8 X-ray flare on NOAA
			AR 10786 (N08W87) between 01:48 - 01:57 UT with peak
			emission at 01:53 UT.

04:54 UT  WS West	Another bright and narrow front with faint loop-like
			extensions toward N. GOES recorded an M1.0 X-ray flare 
			on NOAA AR 10786 (N10W86) between 03:02 - 03:28 UT with
			peak emission at 03:23 UT.

05:54 UT  WS West	Another bright and narrow front (brighter and slightly
			bigger than the previous ones) with faint loop-like
			extensions toward N. GOES recorded a C2.2 X-ray flare
			on NOAA AR 10786 (N07W89) between 05:23 - 05:31 UT
			with peak emission at 05:23 UT.

06:30 UT  WN West	Bright and ragged loop front that apparently comprises
			two fronts: i) one developing toward W (Front [1]), and
			ii) another one, a little bit "elongated", developing 
			slightly toward WNW (Front [2]). They are followed at
			07:54 UT by another bright and ragged loop front (Front
			[3]) that is first seen when it is already half way to
			the end of the C2 FOV. It develops apparently faster 
			than the other two fronts. The events in the C3 FOV 
			show up as one wide loop front developing toward W 
			first seen at 07:42 UT (Front [1]) immediately followed
			by the Front [3] at 08:18 UT. Afterward it becomes
			difficult to separate both events. Also by 08:18 UT
			starts to be discernible the Front [3] on WNW (roughly 
			at a PA that matches that of the northern leg of the 
			wide loop front). This loop on WNW can be tracked 
			running behind the complex front [1]-[3], though later
			seems to be pushed from behind by the following event
			(see next entry --> 10:30 UT). The mean plane-of-sky
			speed of the LE of the complex Front [1]-[3] at PA 274
			was ~ 737 km/sec. GOES reported an M9.1 X-ray flare on
			NOAA AR 10786 (N07W89) that peak at 07:25 UT during a
			long duration X-ray event that started at 05:57 and was
			reported to finish at 07:29 UT. EIT 195 running 
			difference images show a brightening right on the W 
			limb at 06:12 UT followed by a much stronger brightening
			at 07:26 UT. An faint intensity disturbance can be seen
			traveling on the disk toward E.
			
10:30 UT  WN West	Extremely small brightening just appearing that develops
			as an extremely bright, big, and wide loop front by the
			time of the next C2 frame (10:54 UT), the LE already
			reaching the end of the C2 FOV on W. Faint and diffuse
			extensions develop to N. By 11:30 UT, the C2 occulting
			disk is completely covered. The event is first seen in 
			C3 at 11:18 UT, the LE on W already at ~ 10.2 solar
			radii. It appears very bright on W with diffuse
			extensions spanning all above the N Pole. The C3
			occulting disk is covered by 12:42 UT. By that time, 
			the LE on W is already at ~ 21 solar radii. Note 
			that this event develops in the aftermath of a 
			previous big and complex event associated with an M9.1
			X-ray flare (peak at 07:25 UT) that was first seen in 
			C2 at 06:30 UT (see previous entry). The mean plane-
			of-sky speed of the event under analysis in this 
			report at PA 280 was ~ 2280 km/sec (based on only the
			first two C3 frames). After the first two frames, the
			event gets close to the LE of previous event and
			therefore starts to slow down (it becomes more difficult
			to precise the location of the LE). If considered all 
			the C3 frames available at the time of writing, the 
			mean plane-of-sky speed becomes ~ 1430 km/sec at PA 277, 
			showing a marked deceleration. GOES reported a long
			duration X1.2 X-ray flare on NOAA AR 10786 (N10W89) 
			between 10:16 - 11:29 UT with peak emission at 10:55 UT.
			The high energy proton fluxes (>10 Mev) that started to
			gradually increase by ~ 16:00 UT on 2005/07/13 (~ two
			hours after the M5.0 X-ray flare) suffered another
			increase about 1 hour after the peak of the X1.2 X-ray
			flare, most likely associated with the interaction of 
			the CME event under analysis in this report with the
			previous one already under development. EIT 195 running
			difference images show a strong brightening starting at 
			10:24 UT immediately followed by the signature of a big
			CME developing all above the western limb jointly with 
			an intensity disturbance traveling across the disk 
			toward E. In summary, the event has therefore been
			classified as a limb event associated with an X1.2 X-ray
			flare. Its associated shock made it appear as an
			asymmetric full halo event. Note that it is the shock 
			the one which could be partly geoeffective. The
			development of "our" CME event is profoundly affected 
			by the CME event associated to the M9.1 X-ray event. 
			Therefore, it is a complex event what will be dealing
			with at the time of the shock arrival at Earth.

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