STEREO Weekly Meeting Minutes for 2007-02-20 (Week 08)


ANNOUNCEMENTS
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INSTRUMENT AND SPACECRAFT STATUS
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* All subsystems on both spacecraft are nominal.


DISCUSSION AND OPERATIONS CONSTRAINTS
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Week 7

* The scheduled APL network outage occured as planned on Feb 17, and had no
  impact on STEREO operations.

* Two EUVI flat-field off-points occured on the Ahead spacecraft during the
  week:  a SECCHI-driven offpoint on Tuesday, Feb 13, and a spacecraft driven
  off-point on Thursday, Feb 15.

* A time update of about 100 ms was sent to both spacecraft on Friday, Feb 16.

* Station 55 had signal strength problems with the Behind spacecraft on
  Tuesday, Feb 15.  The mode was switched from reverse to normal polarization
  and all data were recovered.  From now on normal polarization will be used
  for both Ahead and Behind spacecraft.

Week 8

* A stepped calibration roll for the SECCHI coronagraphs was performed today on
  Ahead.

* Repeat of SECCHI-driven EUVI flat-field calibration off-point tomorrow on
  Ahead.

* One extra unattended track on Ahead on Friday, Feb 23.

* Additional SECCHI lunar transit practice tomorrow between 15:30 and 19:30 UT,
  partially overlapping a track.  The spacecraft will be slightly off-pointed
  by about 3 arc minutes during this period.

* On Thursday, Feb 22, a momentum dump will be performed on the Behind
  spacecraft at 14:00 UT.  This is expected to last about 5 minutes.  The dump
  will be performed during a track, using the A thruster set on the -X side of
  the spacecraft.  The spacecraft will stay on the HGA during the maneuver, but
  will drop to a telemetry rate of 360 kbps.  Mission operations is predicting
  that momentum dumps will occur every 6 weeks (42 days) on both spacecraft.
  They will generally be targeted for the middle of the week, either Wednesday
  or Thursday.

* The lunar transit, as seen from the Behind spacecraft, will occur on Sunday,
  Feb 25, from 6:56 to 18:57 UT.  There will be a track, from 12:40 to 16:40,
  during the transit, which will be attended, as will the next track starting
  at 13:40 UT on Monday.

Week 9

* There is an HGA calibration maneuver scheduled for the Ahead spacecraft on
  Wednesday, Feb 28.  The calibration is 2 hours long; the total duration of
  the track will be 5 hours.

* A momentum dump of the Ahead spacecraft is scheduled for Thursday, Mar 1.
  The downlink will stay on the HGA at 720 kbps.

* There are six unattended tracks scheduled for Behind during the week.

Week 10

* One track per day on the Ahead spacecraft

* Six additional unattended tracks for Behind.

* Switch to daylight savings time occurs on Sunday, March 11.

Week 11

* SECCHI HI coincident 90/270 degree rolls on Tuesday, March 13.

* SECCHI HI 180 degree rolls on Thursday, March 15.  APL will set up a
  conference call tomorrow morning to discuss these roll maneuvers in more
  detail.

* There is a SUMER/Hinode campaign starting on Tuesday, March 13.  So far,
  nobody has requested SECCHI data during that campaign.  Campaigns which
  desire the availability of SECCHI data should coordinate with Simon Plunkett
  at NRL, even if only synoptic data is requested.

Other

* SECCHI requests that no momentum dumps occur during the two week SECCHI
  campaign May 4-17.

* It was discussed that the switchover to the SPS for DSN schedules should be
  completed now.  The older NSS system is no longer being used.

* Mission Operations is still looking into the question of reallocating the
  SECCHI partitions.


COORDINATED OBSERVATIONS
------------------------

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Scheduled activities for Week 08:

M Feb 19 (050)  
T Feb 20 (051)  Ahead: SECCHI Stepped Cal. Roll, 14:25 UT
W Feb 21 (052)  Ahead: SECCHI-driven EUVI Flat Field Offpoint, 12:15 UT
		Behind: Test of SECCHI lunar transit observations, 15:30 UT
T Feb 22 (053)  Behind: Momentum dump, 14:00 UT
F Feb 23 (054)  
S Feb 24 (055)  
S Feb 25 (056)  Behind: Lunar transit, 06:56-18:57 UT

Notes:
* SECCHI lunar transit test on Feb 21 will off-point from nominal Sun pointing
  by about 3 arc minutes for approximately four hours.

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Scheduled activities for Week 09:

M Feb 26 (057)  
T Feb 27 (058)  
W Feb 28 (059)  Ahead: HGA calibration roll
T Mar 01 (060)  Ahead: Momentum dump, 19:30 UT
F Mar 02 (061)  
S Mar 03 (062)  
S Mar 04 (063)  
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Scheduled activities for Week 10:

M Mar 05 (064)  
T Mar 06 (065)  
W Mar 07 (066)  
T Mar 08 (067)  
F Mar 09 (068)  
S Mar 10 (069)  
S Mar 11 (070)  
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Scheduled activities for Week 11:

M Mar 12 (071)  
T Mar 13 (072)  SECCHI HI coincident 90/270 degree rolls
W Mar 14 (073)  
T Mar 15 (074)  SECCHI HI 180 degree rolls
F Mar 16 (075)  
S Mar 17 (076)  
S Mar 18 (077)  

Notes:
* SUMER/Hinode campaign, Mar 13-Apr 30

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