LASCO Activity Report for
July 13, 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

2005/07/12 (Tuesday)

NOTE:
NOAA AR 10786 continues with C-class X-ray activity along the day. Also a 
couple of M X-ray flares: In particular:

- a C4.2 (N08W58), peak at 02:10 UT, 
- a C2.4 (N13W65), peak at 05:25 UT,
- a C1.5 (N08W61), peak at 06:31 UT,
- a C3.0 (N13W63), peak at 07:00 UT,
- a C8.3 (N09W61), peak at 08:03 UT, 
- a C2.3 (N11W63), peak at 10:03 UT,
- a C3.1 (N11W63), peak at 11:27 UT,
- a C1.5 (N10W63), peak at 12:13 UT,
- a M1.0 (N12W68), peak at 13:06 UT,
- a C2.3 (N13W68), peak at 15:37 UT, 
- a M1.5 (N08W65), peak at 16:24 UT,
- a C4.2 (N10W74), peak at 21:40 UT, 
- a M1.3 (N09W72), peak at 22:52 UT, and
- a C4.0 (N10W77), peak at 23:38 UT.

04:54 UT  WN West	Elongated and diffuse ragged loop-like front in the
			gusty outflow.

05:30 UT  W Limb	Bright and ragged loop front at roughly the PA of the
			southern leg of previous event. Much gusty outflow
			continues.

13:31 UT  WN West	Initially bright ragged front that quickly fades. The 
			slow development of a system of loops follows.

16:54 UT  WN West	Bright loop front that superposes in the LOS with the
			pre-existent slow development of a system of loops. It 
			is immediately followed by another bright front on W. 
			It becomes difficult to separate both fronts in the C2
			FOV. By 19:31 UT, extremely faint extensions can be 
			seen above the N Pole (shock), apparently surrounding 
			the C2 occulting disk shortly afterward. The event is
			first seen in C3 at 17:42 UT, just appearing above the 
			W Limb. During its evolution in C3, the two apparently
			different fronts can be discerned: i) one developing
			slightly toward WNW a little bit ahead (Front #1), and
			ii) another one apparently wider developing toward W
			(Front #2). They both can be seen preceded by a very
	 		faint front ahead. It is not until 22:18 UT that 
			extremely faint extensions can be seen above the N 
			Pole. They are afterward barely discernible. The mean
			plane-of-sky of the LE of Front #1 at PA 292 was ~ 
			525 km/sec, and of Front #2 at PA 294 was 420 km/sec
			(based on C3 data). GOES reported multiple C-class
			(increasing) X-ray activity all along the day, as well 
			as several M-class X-ray flares on NOAA AR 10786. In 
			particular:
			- an M1.0 (N12W69) between 12:47 - 13:25 UT, peaking at
			13:06 UT,
			- a long duration M1.5 (N09W67) between 15:47-18:07 UT,
			peaking at 16:24 UT, and
			- an M1.3 (N09W72) between 22:35 - 23:02 UT, peaking at
			22:52 UT.
			Note that the long duration M1.5 X-ray flare was 
			preceded by an impulsive C2.3 X-ray flare on the same 
			AR (N12W71) between 15:33 - 15:40 UT, with peak emission
			at 15:37 UT. EIT 195 running difference images show a
			small brightening in the northern portion of AR 10786 
			at 15:36 UT followed by a strong brightening at 16:00 UT
			just a little bit to S. An intensity disturbance (wave)
			centered on the AR is seen developing afterward. It can
			clearly be seen traveling across the disk toward E. A
			dimming to N and S of the AR can also be seen. Note that
			it is the shock what could make the LASCO event
			associated to the long duration X-ray flare on AR 10786
			to be geoeffective.

19:54 UT  W Limb	Ragged loop front in the trail of previous event.

23:30 UT  W Limb	Bright and ragged loop front. GOES reported an M1.3
			X-ray falre on NOAA aR 10786 (N09W72) between 22:35 -
			23:02 UT with peak emission at 22:52 UT. Gusty outflow
			continues.

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.

Time of the last C2 image analyzed: 11:54 UT.