LASCO Activity Report for
June 6, 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

* Telemetry Keyhole (SOHO will stay in TM Submode 5 during the Keyhole): 
  2005/06/05 - 2005/06/25: 26 m
  2005/06/09 - 2005/06/20: 34 m

* 2005/05/06 - 2005/06/24: EIT Bakeout (==> No EIT CME Watch).

* 2005/05/05: End of MEDOC Campaign.

* Mercury exited the C2 FOV on 2005/06/04 @ ~ 16:32 UT (to the left).

* Mercury entered the C2 FOV on 2005/06/02 @ 00:32 UT (from the right).

* 2005/05/30 - 2005/06/03 between 06:00 - 09:00 UT:  
  C2 Plumes Study: "Microflares, Jets and Macrospicules in and Around PCH".
  During this time: C2 orange/clear subfield images at a 5 min cadence.  
  FOV 14x16 LOCS block region over the South Pole.
  --> No LASCO CME watch during the time of the run.

* 2005/05/28 - 2005/06/05: LASCO Extra PBs for 3D CME Study.
			   During this time (for the CME watch): 
			   - only 1 C2 Orange/Clear per hour;
			   - only 1 C3 Clear/Clear per hour; and
			   - No EIT CME Watch (only synoptic: 4 EIT 195 per day).

* Medoc Campaign started on May 16. Since then SOHO is in Telemetry submode 5.

2005/06/03 (Friday)

	  W Limb	Since late on previous day, slow development of a system
			of faint loops.

01:32 UT  ES East	Very elongated loop-like front. It fades throughout C3.

04:32 UT  ES East	Diffuse loop-like brightening (some signatures already 
			in previous frame, by 03:32 UT). Inpection of the C2
			Orange/-60 deg sequence shows the diffuse front first
			appearing at 04:09 UT, followed by a brighter ragged
			loop front at 05:09 UT (though by 04:49 UT some
			brightening can already be seen). In this sequence, this
			loop front appears much brighter above the E limb.
			Signatures of the event are gone after the data gap. 
			GOES reported on NOAA AR 10772 the following events:
			- a C3.1 X-ray flare (S17E21) between 01:53 - 02:38 UT
			with peak emission at 02:24 UT, and
			- an M1.3 X-ray flare (S17E22) between 04:03 - 04:16 UT
			with peak emission at 04:11 UT.

	06:00 - 09:00 UT	C2 Plumes study. NO LASCO CME watch images. 
				(see on top "Points of Interest").

10:49 UT  EN East	(Time of C2 Orange/-60 deg): Faint and diffuse ragged
			loop front. The front is completely surpassed by a very
			bright and big loop front by 12:49 UT (time at which
			this big loop front is first seen, its LE being already
			at the end of the C2 FOV). See next event for details.

13:32 UT  E Limb 	Bright and wide ragged loop front on the E Limb, 
			already past the end of the FOV. Extra polarization
			brightness images (for a 3D CME study under way) were
	 		being taken during the time of the event. Therefore,
			according to the different C2 sets, the time of first
			appearance is as follows (Filter/Polarizer):
			- C2 Orange/+60 deg: 12:45 UT.
			- C2 Orange/0 deg:   12:47 UT.
			- C2 Orange/-60 deg: 12:49 UT.
			- C2 Orange/Clear:   13:32 UT. 
			Faint extensions above the N and S Pole can be seen by
			the time, which seem to surround the C2 occulting disk 
			by 15:32 UT -barely above the W Limb- (C2 image at 
			12:32 UT non-existent). As for C3, the time of first
			appearance is as follows:
			- C3 Clear/Clear: 12:38 UT. The faint extensions seem 
			  to surround the C3 occulting disk by 13:38 UT.
			- C3 Orange/-60 deg: 12:54 UT.
			- C3 Orange/+60 deg: 12:56 UT.
			The mean plane-of-sky speed of the LE of the event was 
			~ 1660 km/sec at PA 72 (as measured on C3 Clear/Clear
			data, only 3 frames - in the 4th frame the LE is out 
			of the C3 FOV- ). GOES reported high activity on NOAA 
			AR 10772 during the present and past 2 days (including 
			an impulsive M1.3 X-ray flare at S17E22 that peaked on
			06/03 at 04:11 UT). However, the most likely X-ray 
			event associated to the event observed by LASCO was
			apparently not related to that AR but to an M1.0 X-ray
			flare that occurred on N15E90 between 11:51 - 12:45 UT
			with peak emission at 12:26 UT. The event has therefore
			been determined as a very asymmetric (and extremely
			faint) Full Halo Event, most likely associated with an
			energetic E limb event (M-class X-ray flare). Please 
			note that it is the associated shock the one which 
			gives the appearance of a full halo to the event and
			hence the one that could have a component extending
			toward Earth.

19:32 UT  EN East	Ragged front in the aftermath of previous event. Gusty
			outflow into next day.

2005/06/04 (Saturday)

NOTE: 	Multiple C-class X-ray flares on NOAA AR 10722 during the day (peaks
      	at 00:39 -S17E08-, 00:55 -S18E08-, 01:50 -S18E07-, 06:43 -S18E05-, 
	08:48 -S18E04-, 11:40 -S18E02-, and 16:56 UT -S17W01-).
 
01:32 UT  S Pole	Ragged front developing slightly toward ESE. Some faint
			ragged extension by 02:32 UT on SE. It fades throughout
			C3. Gusty outflow afterward all along the day (rotating
			toward WSW as it develops).

10:32 UT  EN East	Loop front that fades throughout C2.

14:32 UT  W Limb	Bright ragged loop front. A couple of faint and 
			expanding loop fronts follow by 17:32 and 21:32 UT.
			They all fade throughout C3. Gusty outflow in the form
			of faint expanding loop-like fronts well into next day.

20:32 UT  E Limb	Jet-like front.

2005/06/05 (Sunday)

00:32 UT  ES East	Bright and asymmetric loop front already past the end 
			of the C2 FOV. It fades throughout C3.

01:32 UT  EN East	Faint and diffuse (and slightly asymmetric) loop front.

06:32 UT  E Limb	Bright thin fan-like front (fast) developing slightly
			toward ENE. It fades close to the inner edge of C3.

12:32 UT  E Limb	Another fast front (little bit bigger that the previous
			one at 06:32 UT) developing slightly toward ENE. It 
			also fades close to the inner edge of C3.

14:32 UT  ES East	Bright loop front. GOES reported a C3.5 X-ray flare
			on NOAA AR 10776 (S08E80) between 13:04 - 14:08 UT
			with peak emission at 13:50 UT.

17:32 UT  S West	Initially bright elongated loop front. Very faint in C3.
			It fades cloe to the inner edge.

2005/06/06 (Monday)

05:06 UT  E Limb	Bright loop front.

	05:50 - 12:50 UT 	Temporary Data Gap.

Time of the last C2 image analyzed: 14:06 UT.