STEREO Weekly Meeting Minutes for 2008-03-18 (Week 12)


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

* Maintenance work will be done at APL on Saturday, March 29, from 10-16 UT.
  Interruptions are expected in the command interface.  Instrument teams should
  send any commands in advance.


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 11

* Station 43 has been taken down for 2 weeks.  This has required a number of
  changes in the DSN schedule.  The Ahead track on day 71 (Mar 11) was switched
  to station 26.  A Behind track on day 74 (Mar 14) was deleted.

* On day 71 (Mar 11), during the station 26 track on Ahead, a JPL router switch
  tripped offline, causing a 25 minute loss of realtime telemetry and
  commanding.

* On day 73 (Mar 13), ranging lock was lost during the Ahead pass on station
  34 because of an equipment problem.  This resulted in a loss of 21 minutes of
  ranging data.

* On day 71 (Mar 11), during the station 34 pass on Behind, the antenna brakes
  were set when the station was switched to commercial power.  The brakes were
  reset within 1 minute.  Some SECCHI data from the previous day was lost.

* The average daily downlink was 6.9 gigabits on Ahead, and 7.8 gigabits on
  Behind.

Week 12

* Some additional track schedule changes have been made because of the station
  43 downtime.  Two extra tracks on Behind were deleted.  Tracks on Ahead have
  been accommodated by swapping stations.

* The 8th momentum dump on Behind is being carried out today (Mar 18) at 21:25.

* The next Canberra pass on Behind will be on Monday, which will be 8 days
  after the previous pass.

* SECCHI had a ground scheduling problem which resulted in two hours of
  observing being missed yesterday (Mar 17), and another two hours of corrupted
  images.

Week 13

* The 12th momentum dump on Ahead is scheduled for Tuesday, Mar 25, at 16:30
  UT.

* A SWAVES software load for both spacecraft is coming up, and may be scheduled
  for this week if ready.  Opportunities exist Wednesday, Thursday, and Friday.

Week 14

* A SECCHI stepped calibration on Ahead is scheduled for Tuesday, April 1, at
  10:35 UT.

* Opportunities for a SWAVES load exist on Tuesday, Wednesday, and Thursday.
  Good times also exist for the following week.

* High gain antenna calibrations will be carried out on both spacecraft on
  April 2, at 15:00 for Ahead, and 20:00 for Behind.  Tracks have been extended
  for this activity.  A power assessment will be delivered by the FDF.

* A fault protection mode will be written to EEPROM on both spacecraft on
  Thursday, April 3.

Week 15

* No unusual activities.

Other

* Expect station 34 to be back online on day 86 (Mar 26).

* The Whole Heliospheric Interval starts Thursday, March 20.  There is now a
  planning calendar available on the WHI website at http://ihy2007.org/WHI/.


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

-------------------------------------------------------------------------------
Scheduled activities for Week 12:

M Mar 17 (077)  
T Mar 18 (078)  Behind: Momentum dump 21:25
W Mar 19 (079)  ICAL001, 14:00 UT
T Mar 20 (080)  Start of Whole Heliosphere Interval Campaign
		JOP 201, Linking Corona to Solar Wind at Ulysses
F Mar 21 (081)  JOP 201, Linking Corona to Solar Wind at Ulysses
S Mar 22 (082)  JOP 201, Linking Corona to Solar Wind at Ulysses
S Mar 23 (083)  JOP 201, Linking Corona to Solar Wind at Ulysses

Notes:
* Whole Heliosphere Interval, Mar 20 - Apr 16

-------------------------------------------------------------------------------
Scheduled activities for Week 13:

M Mar 24 (084)  JOP 201, Linking Corona to Solar Wind at Ulysses
T Mar 25 (085)  Ahead: Momentum dump 16:30 UT
		JOP 201, Linking Corona to Solar Wind at Ulysses
W Mar 26 (086)  JOP 201, Linking Corona to Solar Wind at Ulysses
T Mar 27 (087)  JOP 202, Origin of the Slow Solar Wind
F Mar 28 (088)  JOP 202, Origin of the Slow Solar Wind
S Mar 29 (089)  JOP 202, Origin of the Slow Solar Wind
		JOP 206, Low-latitude coronal holes
S Mar 30 (090)  JOP 202, Origin of the Slow Solar Wind
		JOP 206, Low-latitude coronal holes

Notes:
* Maintenance work will be performed at APL on Saturday, March 29.
* Whole Heliosphere Interval, Mar 20 - Apr 16

-------------------------------------------------------------------------------
Scheduled activities for Week 14:

M Mar 31 (091)  JOP 202, Origin of the Slow Solar Wind
		JOP 194, Activity in Filaments and Filament Cavities
T Apr 01 (092)  Ahead: SECCHI stepped calibration roll 10:35 UT
		JOP 202, Origin of the Slow Solar Wind
		JOP 194, Activity in Filaments and Filament Cavities
W Apr 02 (093)  Both: HGA calibrations, Ahead: 15:00, Behind 20:00 UT
		JOP 202, Origin of the Slow Solar Wind
		JOP 194, Activity in Filaments and Filament Cavities
T Apr 03 (094)  JOP 203, Coronal hole boundaries
F Apr 04 (095)  JOP 203, Coronal hole boundaries
S Apr 05 (096)  JOP 203, Coronal hole boundaries
S Apr 06 (097)  JOP 203, Coronal hole boundaries

Notes:
* Whole Heliosphere Interval, Mar 20 - Apr 16

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

Upcoming events:

2008:

SECCHI Stepped calibration rolls
	Ahead:	Jun 24, Sep 23, Dec 16
	Behind:	May 20, Aug 26, Dec 2

* Dec 2007-May 2008	Ulysses quadrature
      http://stereo-ssc.nascom.nasa.gov/plans/UlyLocation2006-2014_v1.pdf

* Mar 20 - Apr 16	Whole Heliosphere Interval
			http://ihy2007.org/WHI/targeted_plans.shtml
    Mar 20-26		JOP 201, Linking Corona to Solar Wind at Ulysses
    Mar 27-Apr 2	JOP 202, Origin of the Slow Solar Wind
    Apr 3-9		JOP 203, Coronal hole boundaries *or*
    			JOP 206, Low-latitude coronal holes
    Apr 10-16		JOP 204, Energetics and dynamics of quiet Sun
      			Targets of opportunity: JOPs 205, 206, 194

* Apr 21 - May 16	SUMER campaign
* Oct 6			Messenger - Mercury fly-by