STEREO Weekly Meeting Minutes for 2008-07-08 (Week 28)


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

* None.


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

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


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

Week 27

* The station 25 tranmitter went offline during the Ahead pass on day 182
  (Jun 30), causing several minutes of SECCHI data loss.  It was decided to not
  reestablish the command connection to avoid further data loss.  Thus, there
  was no tracking data for 108 minutes.

* The first of two SECCHI GT-driven off-points were carried out on day 182 (Jun
  30) on both spacecraft.  These off-points are used to flat field the EUVI
  telescope.

* The average daily downlink was 7.5 gigabits on Ahead and 7.8 gigabits on
  Behind.

Week 28

* The second of the SECCHI GT-driven off-points for EUVI calibration was
  carried out yesterday (Jul 7) at 16:15 UT.

* The 8th HGA calibrations are scheduled on both spacecraft tomorrow (Jul 9),
  at 14:00 UT for Ahead, and 17:00 UT for Behind.  HGA roll scripts in case of
  star tracker loss will also be tested.  The tests are split between the
  spacecraft, and will roll by +/- 0.5 on Ahead, and +/- 1.0 degrees on Behind.
  The tests are being combined with the HGA calibrations because they use the
  same DSN configuration.  The HGA calibration will take about an hour, and the
  script testing will take about 30-45 minutes.  There is sufficient time in
  the track to perform both of these activities, and to play back the SSR data.

Week 29

* The 10th momentum dump will be performed on Behind on day 199 (Jul 17) at
  19:45 UT.

Week 30

* Nothing unusual planned.

Other

* Track durations on both spacecraft will increase from 4 to 5 hours on both
  spacecraft on Aug 4.  Ahead is expected to drop to 480 kbps around Aug 11,
  and Behind around Sep 8.  A test track for the 480 kbps is coming up, and
  APL will inform the teams when it is scheduled.

* At the same time the data rate drops to 480 kbps, the double playback of
  insitu instrument data will end, which means that the insitu teams will see
  the same occasional data gaps that SECCHI does now.  Some of the data gaps
  may be filled in by space weather data from the NOAA antenna partners.  At
  present, there are no telemetry or CDF products which merge the space weather
  data from the antenna partners with the playback data from the SSR.

* The data allocations between the instrument teams will change when the rate
  drops to 480 kbps.  This is outlined in the Science Operations Plan at

	http://stereo-ssc.nascom.nasa.gov/publications/stereo_sop.pdf

  The space weather allocation will stay the same.  No changes are made to DFDs
  or other procedures to implement these changes.


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

-------------------------------------------------------------------------------
Scheduled activities for Week 28:

M Jul 07 (189)  Both: SECCHI GT-driven off-point, 16:15 UT
T Jul 08 (190)  
W Jul 09 (191)  HGA calibrations, Ahead: 14:00, Behind: 17:00
T Jul 10 (192)  
F Jul 11 (193)  
S Jul 12 (194)  
S Jul 13 (195)  

-------------------------------------------------------------------------------
Scheduled activities for Week 29:

M Jul 14 (196)  
T Jul 15 (197)  
W Jul 16 (198)  
T Jul 17 (199)  Behind: momentum dump, 19:45
F Jul 18 (200)  
S Jul 19 (201)  
S Jul 20 (202)  

Notes:
* ICAL July 16, 11-14 UT

-------------------------------------------------------------------------------
Scheduled activities for Week 30:

M Jul 21 (203)  
T Jul 22 (204)  
W Jul 23 (205)  
T Jul 24 (206)  
F Jul 25 (207)  
S Jul 26 (208)  
S Jul 27 (209)  

-------------------------------------------------------------------------------

Upcoming events:

2008:

SECCHI Stepped calibration rolls
	Ahead:	Sep 23, Dec 16
	Behind:	Aug 26, Dec 2

ICAL-001: Aug 4-8, Sep 1-5, Oct 6-10, Nov 3-7, Dec 1-5

* Jul 23,30		EIT shutterless
* Aug 1			Total solar eclipse, 9:20-11:20 UT
		http://eclipse.gsfc.nasa.gov/SEmono/TSE2008/TSE2008.html
* Aug 4			Begin 5 hour daily DSN tracks
* Aug 11		Ahead:  Switch downlink rate to 480 kbps
* Sep 8			Behind: Switch downlink rate to 480 kbps
* Oct 6			Messenger - Mercury fly-by
* Nov 1-Dec 15		SUMER campaign