STEREO Weekly Meeting Minutes for 2007-07-03 (Week 27)


ANNOUNCEMENTS
-------------

* The Ahead SSR playback on Monday, July 9, will be shortened by 40 minutes to
  accommodate the schedule variations for the several DAWN launch windows.  The
  SECCHI team will need to take this into account in their planning.


INSTRUMENT AND SPACECRAFT STATUS
--------------------------------

* All subsystems on both spacecraft are nominal, except that the Ahead
  spececraft is currently operating on IMU #2.

* SECCHI-Behind had a watchdog error on day 182.  This is the second watchdog
  error on Behind.  The SECCHI Configuration Monitor at NRL wasn't running, and
  the watchdog reset wasn't noticed immediately.  The SECCHI team has taken
  steps to ensure that this program is running during every pass.  The SECCHI
  realtime telemetry rate drops by a factor of two after a watchdog reset, and
  the SECCHI team requests that they be notified when this occurs.


DISCUSSION AND OPERATIONS CONSTRAINTS
-------------------------------------

Week 26

* The command link to the Ahead spacecraft was lost temporarily on day 176,
  because of an overload of the transmitter generator.  A SWAVES command was
  delayed, and went up the next day.  The MOC is checking to confirm that the
  command did go up.  SWAVES generally commands 3 days in advance, so this
  delay did not affect them.

* New alignment parameters were uploaded to the G&C on both the Ahead and
  Behind spacecraft on day 176.

* New autonomy rule for GT data was uploaded to the Ahead spacecraft on day
  177.  This new rule is currently uploaded only to RAM.

* PLASTIC flight software was uploaded to Ahead on day 177.

* The current commanding scheme is to send 10 command frames, and then wait to
  check the command counter before continuing on.  Now that the time delay from
  the spacecraft is significantly higher than before, commanding goes slowly.
  The MOC proposes to change this parameter from 10 command frames to 60.

* A test was performed on the Ahead spacecraft on day 178 where the IMU was
  disabled, and the spacecraft used first star-tracker rates, and then Guide
  Telescope data to control pointing.  The test went well.  Effects were
  noticed by the COR1 telescope.  APL will send precise timing information to
  the SECCHI team, so that effects in the data can be correlated with the test.

* The daily average downlink rate was 6.9 gigabits for Ahead and 6.4 gigabits
  for Behind.

* SECCHI-Behind had a watchdog error on day 182.  See above for details

Week 27

* The PLASTIC software upload to Behind was accomplished successfully.

* The normal weekly attended track is occuring today, day 184, because of the
  holiday tomorrow, July 4th.

* There will be a momentum dump on Ahead on Thursday, July 5, at 13:00 UT.

* There are about double the usual number of tracks on Behind this week.

* DAWN launch is scheduled for Saturday, July 8, at 20:39 UT, with contingency
  dates on July 9 and 10.

Week 28

* The SSR playback on Monday is shortened by 40 minutes to accommodate the
  various DAWN launch windows.  The only other possible affect that a DAWN
  launch delay is a 5 minute shift on day 208.  There are no affects at all for
  the Behind spacecraft.

* The tracks on Wednesday, July 11, will be 7 hours long for both spacecraft to
  accommodate the HGA calibrations.

* There is one extra track on Behind in week 28.

Week 29

* Only the minimum requirement of one track per day per spacecraft is
  scheduled.

Other

* The SECCHI team has requested the dates Jan 7-20 for the next high-rate
  telemetry campaign.  APL will pass this request along to DSN.

* The SECCHI team has also requested a test to disable the use of the GT by the
  IMU for 5 minutes.  Because their scheduler is on vacation this week, they
  request that this be scheduled for the second half of next week.  They plan
  on turning on the high rate GT data during this test, which makes it
  preferable to schedule the activity outside of a track.

* SECCHI has also requested a spacecraft-driven off-point on Behind.  It may
  take APL some time to write and test the script to accomplish this.

* JOP 188 started on Sunday, July 1st.  This JOP is to study the composition
  and variability in prominences.  It runs from July 1 to August 5.  The STEREO
  contribution is covered by the regular SECCHI synoptic program.  There is
  also interest is having the four hours of SSR2 (special event) observations
  coincide with observing time in Hawaii.  The SECCHI team cannot change their
  current schedules, but may be able to do this later in the month.

* JOP 194 will run from August 8-18, and will study activity in filament and
  filament cavities.  Again, the major objectives will be met by the SECCHI
  synoptic program, but there is interest in having the four hours of SSR2 data
  coincide with observing time in Hawaii.  The SECCHI team will have to balance
  this request against the possibility that they will have their onboard event
  detection algorithm working, which controls the time period of SSR2 data
  recorded.

* The SSC has incorporated new beacon processing software from the IMPACT and
  PLASTIC teams.  The updated PLASTIC software handles the new beacon telemetry
  format associated with the recent PLASTIC software uploads.  There is also a
  new beacon page plotting solar energetic particle data from IMPACT.


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

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Scheduled activities for Week 27:

M Jul 02 (183)  JOP 188 continues
      	 	Behind: PLASTIC software load
T Jul 03 (184)  Behind: PLASTIC software load (contingency)
W Jul 04 (185)  
T Jul 05 (186)  Ahead: Momentum dump, 13:00 UT
F Jul 06 (187)  
S Jul 07 (188)  
S Jul 08 (189)  

Notes:
* JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5
* DAWN launch scheduled for July 7

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Scheduled activities for Week 28:

M Jul 09 (190)  JOP 188 continues
T Jul 10 (191)  
W Jul 11 (192)  Both: HGA calibrations
T Jul 12 (193)  
F Jul 13 (194)  
S Jul 14 (195)  
S Jul 15 (196)  

Notes:
* JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5

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Scheduled activities for Week 29:

M Jul 16 (197)  JOP 188 continues
T Jul 17 (198)  
W Jul 18 (199)  
T Jul 19 (200)  
F Jul 20 (201)  
S Jul 21 (202)  
S Jul 22 (203)  

Notes:
* JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5

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