LASCO Activity Report for
June 27, 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

* First EIT 195 full res image after bakeout and calibrations: 
  2005/06/25 @ 01:40 UT.

* LASCO is in Telemetry Submode 6 since 2005/06/23 @ ~ 15:30 UT.

* 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

* During the KEYHOLE, LASCO will be in synoptic improved program (12 min 
  cadence C2, 30 min cadence C3), with little loss of telemetry throughout 
  due to the advanced recorder setup.

* 2005/05/06 - 2005/06/24: EIT Bakeout (==> No EIT CME Watch).
  EIT performed the long pre-bake calset (06/06 15:58-21:45 UT) and went 
  to heaters on at 21:52 UT. EIT will be in bake till June 24 @ 10:00 UT 
  and should resume imaging by (06/24) 20:00 UT.
 

2005/06/24 (Friday)

	
00:00 UT  N East	Very faint and diffuse jet-like front that quickly 
			fades.

	07:24 - 14:00 UT	Temporary Data Gap.

	17:48 - 19:53 UT	Temporary Data Gap.

19:53 UT  NN West	Elongated jet-like front developing toward NW.

20:54 UT  E Limb	Big ragged loop front. It fades throughout C3.

2005/06/25 (Saturday)

06:54 UT  EN East	Loop-front apparently seen alnmost edge-on preceding 
			halo event (see next entry).

08:06 UT  S Pole	Very faint and diffuse front all above the S Pole. By
	  (HALO)	08:30 UT, a bright 'folded-like' feature can be seen
			rising on ENE, and a faint loop-like front developing 
			on W. By 09:06 UT, the C2 occulting disk is completely
			covered.  The halo event was first seen in the C3 FOV 
			at 08:42 UT, above the E - SE limb. The C3 occulting 
			disk is fully covered by 09:42 UT (emission brighter 
			on ENE). The mean plane-of-sky of the LE at several PA 
			is given below (based on C3 data):
			. PA 024: 357 km/sec
			. PA 068: 429 km/sec
			. PA 119: 880 km/sec (LE very diffuse)
			. PA 159: 604 km/sec
			. PA 265: 581 km/sec
			showing in all cases practically no acceleration. GOES
			reported no significant X-ray activity by the time.
			However, it did report i) a C1.3, and ii) a B 4.3 X-ray
			flares on NOAA AR 10780 (around S09W33) with peak
			emissions at 03:46 UT and 04:04 UT, respectively. EIT 
			195 images show a relatively strong brightening on AR
			10780 peaking at 03:48 UT. By 04:12 UT, some material
			seems to be ejected toward SW. Also by that time, a 
			faint intensity disturbance can be seen on the south-
			east quadrant (on a quiet region of the Sun), apparently
			developing jointly with the event above the AR 10780. 
			On the other hand, running difference images of EIT 195
			show a very faint intensity disturbance above the E 
			Limb at around 08:00 UT, extending toward S as it
			develops. Also, another one above the SW limb by 
			08:12 UT. Therefore, despite the frontsided activity
			observed on both AR 10780 and the quiet region on the
			southeastern quadrant (they seems to occur too early 
			to be associated with the LASCO event), the event seems
			to be backsided (based on the faint signatures observed
			by the right time on the EIT running difference images).
			In summary, the event has therefore been determined as 
			a full halo event, apparently backsided.

09:54 UT  E Limb	Slow system of loops starts to be seen on E in the
			aftermath of previous halo event. It develops as an
			expanding twisted structure (towards ENE). Gusty outflow
			follows.
	

2005/06/26 (Sunday)

	
07:31 UT  N East	Bright loop-like front just appearing. It develops as 
	  (HALO)	a slightly asymmetric expanding loop front toward N
			(brighter on NE). By 08:06 UT, very faint extensions 
			all above the S Pole make the event to look like a 
			full halo event. The event was first seen in the C3 
			FOV at 08:18 UT, just appearing above the NE limb. The
			'bulk' of the CME develops toward N, spanning all the 
			way from the E limb, N Pole, up to the W Limb. By 
			09:42 UT, very faint extensions can be seen above the 
			S Pole. The mean plane-of-sky of the LE at several PA 
			is given below (based on C3 data):
			. PA 008: 475 km/sec
			. PA 048: 450 km/sec
			. PA 274: 444 km/sec 
			showing in all cases a very slight deceleration. EIT 
			195 running difference images show signatures of a
			backsided CME starting at 07:36 UT above the E Limb. 
			An intensity disturbance traveling toward N all above 
			the NE limb can be seen afterward. GOES reported a 
			B5.0 X-ray flare on N15E83 between 07:06 - 07:59 UT 
			with peak emission at 07:36 UT, apparently associated
			with the signatures observed in EIT. In summary, and
			based on the appearance of the event in EIT running
			difference images (jointly with the lack of activity 
			on the disk) the event has therefore been determined 
			as an asymmetric full halo event, most likely backsided.
			Outflow follows on ENE.

14:30 UT  E Limb	Bright and narrow front. By 14:54 UT, a very faint
			expanding front with the southern leg at roughly the
			PA of this narrow front develops toward N.

2005/06/27 (Monday)

	
	04:06 - 06:30 UT	Temporary Data Gap.

06:30 UT  E Limb	Bright ragged loop front already under development after
			previous short data gap.

NOTE: 
Multiple B-class X-ray flares and one C2.8 X-ray flare during the day from
a yet unnambered region on E (at about N14E85 in average).

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