STEREO Weekly Meeting Minutes for 2009-03-24 (Week 13) ANNOUNCEMENTS ------------- * APL is gathering instrument input (estimated activities, duration, command support, etc) for the planned G&C software load. APL has an internal review for this system reset on April 15th and would like the instrument information by April 13th. See details below. * The APL email outage is this Saturday, March 28th, 7 AM to 3 PM EDT. (11 - 19 UT) INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spacecraft is currently operating on IMU #2. * On day 080, several hours before BOT, DSS 55 was declared red since the antenna elevation brakes could not be released. This resulted in the loss of all TT&C services for the duration of the track. The SECCHI SSR1 partition reached 100% at 080-17:46:10Z till 081-06:16:14Z. (See DR# M105281 for more information.) * On day 078, the day 080 DSS 15 track was moved 25 minutes later and the station was switched to DSS 24 to avoid possible RF interference for Behind. * For Behind, IMU2 continues to be used as the G&C gyro sensor. While IMU1 is nominal, IMU2 is being used to characterize its performance. * The average daily SSR playback volume for Ahead was 6.2 Gbits during this week. * The average daily SSR playback volume for Behind was 5.9 Gbits during this week. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 12 * On day 077 (Mar 18), the first SECCHI HI 180 degree roll on Behind to observe the L5 libration point was executed successfully. * SECCHI planned to carry out tests of a new observing campaign Mar 17 on both spacecraft. Because of some commanding errors, observations on Behind stopped at 04:00 UT, and resumed at 00:00 UT. * DSN recommended in the previous week that SSR playback be delayed by 50 minutes during the station 15 pass on Behind on Friday (Mar 20), because of expected RF interference. * Behind is still operating on IMU #2 for testing. It is performing nominally. The switch back to IMU #1 is planned for Apr 8. * The average daily SSR playback was 5.9 gigabits on Ahead, and 6.2 gigabits on Behind. Week 13 * The 20th momentum dump occurred on Ahead on Mar 25, at 14:30 UT. * (Note change) The EIT shutterless campaign (combined with JOP 216) was originally supposed to run March 27 and April 2. Because of a DSN problem, this has been changed to a single run on April 1. * SWAVES plans to do a memory load on both spacecraft. They require 2 hours of solid commanding, followed by a period of sporadic commanding. Week 14 * (Note change) The EIT shutterless campaign (combined with JOP 216) was originally supposed to run March 27 and April 2. Because of a DSN problem, this has been changed to a single run on April 1. Week 15 * The next HI 180 degree roll maneuvers are scheduled for Apr 8 on both spacecraft, starting at 03:50 for Ahead, and 07:50 for Behind. Scheduling is mainly driven by the system momentum. * The next SECCHI stepped calibration roll on Behind is scheduled for Tuesday, Apr 7, starting on 01:40 UT. This is the perihelion roll, which was pushed back because of the extra roll that occurred in March. Week 16 * A SUMER campaign is scheduled for Apr 15-29. * (Note change) The SUMI sounding rocket launch originally scheduled for Apr 16 is now postponed until July. Other * A new launch date for the HERSCHEL sounding rocket has not yet been announced. * APL is gathering system requirements(estimated activities, duration, command support, etc) from the instrument teams for the planned G&C upgrades, when the instruments will be powered down and back up again. The upgrades are still in the process of being approved. APL has an internal review for this system reset on April 15th and would like the instrument information by April 13th. The activity is tentatively scheduled to occur on Behind on May 12, when a 70 meter track is scheduled. The upgrade is being performed first on Behind, because it has two working IMUs. It was expressed that Behind is most important scientifically, because of its use for space weather forecasting. * The G&C upgrades for Ahead would be scheduled later, in the June/July timeframe. * The dates for switching switching telemetry rates have been pushed back. The switch to 360 kbps is now scheduled for August/September. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 23 (082) T Mar 24 (083) W Mar 25 (084) Ahead: momentum dump, 14:30 UT T Mar 26 (085) F Mar 27 (086) S Mar 28 (087) S Mar 29 (088) ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Mar 30 (089) T Mar 31 (090) W Apr 01 (091) JOP 80, EIT shutterless, 16-19 UT JOP 216, Oscillations in Polar Plumes, 12-16 UT T Apr 02 (092) F Apr 03 (093) S Apr 04 (094) S Apr 05 (095) Notes: * JOP 216, Multi-wavelength Observations of Oscillations in Polar Plumes Target is south pole/southern coronal hole ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 06 (096) T Apr 07 (097) Behind: SECCHI stepped calibration roll W Apr 08 (098) Both: SECCHI HI 180 degree rolls, Ahead: 03:50, Behind: 07:50 Behind: Switch back to IMU #1 T Apr 09 (099) F Apr 10 (100) S Apr 11 (101) S Apr 12 (102) ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 13 (103) T Apr 14 (104) W Apr 15 (105) Start of SUMER campaign T Apr 16 (106) F Apr 17 (107) S Apr 18 (108) S Apr 19 (109) Notes: * Apr 15-29 SUMER campaign, JOPS 178,195,207,210,214,215,217,218,219 http://www.mps.mpg.de/services/campaignplanner/planning/campaign-200904/ Contact Davina Innes-Markiewicz for access ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: Apr 6-10, May 11-22, Jun 15-19, Jul 13-17, Aug 17-21 SECCHI Stepped calibration rolls Ahead: Jun 9, Sep 2, Nov 24 Behind: Jun 16, Sep 22, Dec 22 * Mar/Apr (TBD) ICAL14, Herschel sounding rocket launch http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf * Apr 15-29 SUMER campaign, JOPS 178,195,207,210,214,215,217,218,219 http://www.mps.mpg.de/services/campaignplanner/planning/campaign-200904/ Contact Davina Innes-Markiewicz for access * Jun 1-Jul 10 Sunrise 5-day balloon flight http://star.mpae.gwdg.de/Sunrise/project/publicat/SPIE_2004.pdf * Jul 1 Both: HGA calibration * Jul 22 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009.html * Jul 28 (TBC) SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * Aug 10 Both: Begin 6 hour daily DSN tracks * Aug 17 Ahead: Switch downlink rate to 360 kbps * Sep 8 Behind: Switch downlink rate to 360 kbps * Sep 10 Ahead at L4 Lagrange point * Sep 29 Messenger - Mercury fly-by * Oct 26 Behind at L5 Lagrange point * Nov 1-Dec 15 SUMER campaign (TBC) * Nov 30 Behind: Begin 7 hour daily DSN tracks * Dec 7 Behind: Switch downlink rate to 240 kbps 2010: SECCHI Stepped calibration rolls Ahead: Feb 23, May 18, Aug 10, Nov 2 Behind: Apr 6, Jul 13, Oct 12 * Jan 6 Both: HGA calibration * Apr 19 Ahead: Begin 7 hour daily DSN tracks * Apr 26 Ahead: Switch downlink rate to 240 kbps * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Sep 7 Both: Begin 8 hour daily DSN tracks * Sep 13 Both: Switch downlink rate to 160 kbps * Nov 15 Behind: Switch downlink rate to 120 kbps 2011: * Jan 12 Both: HGA calibration * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul 13 Both: HGA calibration * Aug DAWN - Vesta arrival * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 11 Both: HGA calibration * May DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug Both: Switch downlink rate to 30 kbps 2013: 2014: 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission