STEREO Weekly Meeting Minutes for 2011-07-05 (Week 27) ANNOUNCEMENTS ------------- * There will be a network outage at APL on Sunday, Jul 10, between 11-23 UT. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 26 (Jun 27-Jul 3) * On day 178 (Jun 27), during the DSS 65 support for Ahead, the support ended 15 minutes early at 0800z to support the THEMIS-B (ARTEMIS) lunar orbit insertion. The SSR pointers were repositioned during the next track. All SSR data were recovered. * On day 179 (Jun 28), during the DSS 15 support for Ahead, monitor data and the command link were lost at 1445 due to a RIONet communication link anomaly between GSFC and JPL. After RIONet link was switched back to the primary side at 1501z, monitor data was received and the command link was reestablished. Later in the support, the turbo decoder lost lock briefly at 2146z. This anomaly resulted in the loss of 16 minutes of monitor and command data and one frame of SSR data. See DR# N107450 for more information. * On day 182 (Jul 1), during the DSS 26 support for Ahead, real-time telemetry was lost beginning at 1450z through 1508z due to a DCD anomaly. This anomaly resulted in the loss of 18 minutes of real-time telemetry. All SSR data were recovered. See DR# N107461 for more information. * On day 184 (Jul 3), during the DSS 43 support for Ahead, initial telemetry acquisition was delayed seven minutes due to rain at Canberra and low elevation. Telemetry lock was established at 1932z after elevation increased and precipitation diminished. This anomaly resulted in the loss of seven minutes of real-time telemetry. All SSR data were recovered. See DR# C108107 for more information. * On day 178 (Jun 27), the IMPACT IDPU on Ahead reported a bit-flip in RAM at approximately 1300z which affected science data collection. At 2030z, real-time commands were sent to correct the anomaly. * On day 178 (Jun 27), the AHEAD S/C switched to routinely using the 160 kbps downlink rate for 34 meter antenna tracks and 480 kbps for 70 meter antenna tracks. * On day 179 (Jun 28), a flight software patch to the IMPACT IDPU on Ahead was conducted to prevent the LET instrument from resetting during high rate particle events. The same patch was applied to Behind on day 181 (Jun 30). Testing on the ground unit led the LET team to discovere a vulnerability in the code at high particle fluxes which duplicated the crashes seen on the flight instrument. The patch corrects this vulnerability. * On day 178 (Jun 27), during the DSS 63 support for Behind, turbo decoder lock was lost briefly beginning at 1930z. This resulted in the loss of one frame of instrument SSR data. A DR has been requested. * On day 181 (Jun 30), during the DSS 63 support for Behind, turbo decoder lock was lost briefly beginning at 1936z. This resulted in the loss of two frames of instrument SSR data. A DR has been requested. * On day 182 (Jul 1), during the DSS 63 support for Behind, real-time telemetry was lost beginning at 1526z through 1730z due to the same DCD anomaly that affected the Ahead pass. The SSR pointers were repositioned and all SSR data was recovered. This anomaly resulted in the loss of 124 minutes of real-time telemetry. See DR# M106390 for more information. * On day 179 (Jun 28), a flight software load to the IMPACT IDPU on Behind was conducted for the PLASTIC instrument flight software update (Version 32A) to provide user control to reduce the overall telemetry rate contributed by the PLASTIC instrument. With this update, PLASTIC can control which ApIDs are to be downlinked and the accumulation period for the Heavy Ion products. IMPACT executed a soft reset of the IDPU, which is shared with PLASTIC, to activate the new flight software loaded at 1930z. IMPACT completed configuring their instruments during the same track by 2100z. The same software update was applied on Ahead during week 24. * On day 180 (Jun 29), PLASTIC completed configuring their instrument on Behind after the IDPU soft reset at 0157z. * On day 180 (Jun 29), the MOC SDS workstation lost connectivity to its disk drive at 0500z. Connectivity was restored 1400z and the daily data products placed on-line by 1700z. * On day 183 (Jul 2), the IMPACT IDPU on Behind experienced an SEU which affected heater control. This was earlier reported to affect SEP operations, which is not correct. Real-time commands were sent to correct the error on day 184 (Jul 3). * The average daily SSR playback volume was 4.7 gigabits for Ahead, and 6.6 gigabits for Behind. Week 27 (Jul 4-10) * Switch over to Space Link Extension (SLE) protocol will take place on Ahead tomorrow (Jul 6) during the DSS 14 track starting at 11:05 UT, and on Behind on Thursday (Jul 7) during the station 65 track starting at 18:00 UT. The date for Behind was changed to be further from the Jul 4 holiday. Both the switches will take place during business hours. * Turbo lock was lost momentarily at 8:12 UT during the station 34 pass for Behind yesterday (Jul 4). This is expected to cause the loss of 1-2 frames of telemetry data. * Network switch replacements at APL are scheduled for Sunday, Jul 10, between 11-23 UT. This will affect all external network connectivity at APL, and no realtime data will be available for passes for both spacecraft. The RIONet will be available for monitoring track operations, but the data won't be available remotely. The instrument teams will not be able to see their telemetry, nor send commands. This will affect the station 26 pass for Ahead, and the station 63 pass for Behind. Data products may be delayed. * Ahead has 480 kbps passes on Tuesday, Jul 5 (D63 and D14), Wednesday, Jul 6 (D63 and D14), Thursday, Jul 7 (D14), and Friday, Jul 8 (D63). There are 13 passes during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Tuesday, Jul 5 (D63), Friday, Jul 8 (D43), and Sunday, Jul 10 (D63). There are 12 passes during the week, and overall coverage is nominal. Week 28 (Jul 11-17) * Behind will switch to the 160 kbps rate for 34 meter stations, and 480 kbps for 70 meter stations, starting with the station 55 pass on Jul 13. * Both spacecraft will have the 14th HGA calibration on Jul 13, with Ahead starting at 15:00 UT, and Behind starting at 16:00 UT. Preparation for the maneuvers will start about an hour in advance, and the procedure will take about 1-1.5 hours to complete. The spacecraft will be rolled by 0.5 degrees in each direction. * Behind will have the 33rd momentum dump on Tuesday, Jul 12, starting at 19:30 UT. * Ahead will have the 39th momentum dump on Thursday, Jul 14, starting at 15:00 UT. * Ahead has 480 kbps passes on Tuesday, Jul 12, and Saturday, Jul 16, both using station 43. There are 10 passes during the week, and overall coverage is 3.6 hours above nominal. * Behind has 720 kbps passes on Tuesday, Jul 12 (D43 and D63), and 480 kbps passes on Thursday, Jul 14 (D43), Friday, Jul 15 (D43 and D63), and Sunday, Jul 17 (D43). There are 15 passes during the week, and overall coverage is 4.1 hours above nominal. Week 29 (Jul 18-24) * The test of the 135 degree roll to observe comet Elenin from Behind is scheduled for Friday, July 22 between 12-14 UT. The MOC would like feedback from SECCHI within a week of the test. The rolls to observe comet will take place between Aug 1-12. * Ahead has 480 kbps passes on Monday, Jul 18, Tuesday, Jul 19, Wednesday, Jul 20, and Thursday, Jul 21, all using station 14. There are 8 passes during the week, and overall coverage is nominal. * Behind has 480 kbps passes on Thursday, Jul 21, Friday, Jul 22, and Saturday, Jul 23, all using station 63. There are 13 passes during the week, and overall coverage is 3 hours above nominal. Week 30 (Jul 25-31) * The 18th SECCHI stepped calibration roll on Ahead is scheduled for Tuesday, day 207 (Jul 26), starting at 7:15 UT. This is the midpoint roll. System momentum is expected to be about 6 N-m-s. * The SECCHI stepped calibration roll on Behind has been moved ahead a week, because of the comet Elenin observations, and is also scheduled for Jul 26, starting at 9:00 UT. This is also the midpoint roll. * Ahead has 480 kbps passes on Monday, Jul 25, Tuesday, Jul 26, and Wednesday, Jul 27, all using station 63. There are 13 passes during the week, and overall coverage is 1.2 hours above nominal. * Behind has 480 kbps passes on Friday, Jul 29, using stations 14 and 43. There are 14 passes during the week, and overall coverage is 6.5 hours above nominal. Week 31 (Aug 1-7) * The launch window for JUNO opens at 15:26 on Aug 5. This is the first of several upcoming launches that will impact the STEREO schedule. If JUNO doesn't launch the first day, the Ahead pass on Saturday, Aug 6, may be reduced by 50 minutes. * The 135 degree rolls on Behind to observe comet Elenin will start on Aug 1. The rolls will be between 8-10 UT each day, except for Aug 5 and Aug 12, when the rolls will be between 10-12 UT. * Ahead has 480 kbps passes on Monday, Aug 1 (D14), Tuesday, Aug 2 (D14), Wednesday, Aug 3 (D63), and Thursday, Aug 4 (D43). There are 9 passes during the week, and overall coverage is nominal. * Behind has 480 kbps passes on Thursday, Aug 4 (D14), and Friday, Aug 5 (D43). There are 13 passes during the week, and overall coverage is nominal. Week 32 (Aug 8-14) * The 135 degree rolls on Behind to observe comet Elenin will continue through Aug 12. * Ahead has 480 kbps passes on Friday, Aug 12 (D14), Saturday, Aug 13 (D63), and Sunday, Aug 14 (D14). There are 10 passes during the week, and overall coverage is nominal. * Behind has 480 kbps passes on Tuesday, Aug 9 (D14 and D63), and Thursday, Aug 11 (D63). There are 14 passes during the week, and overall coverage is nominal. Week 33 (Aug 15-21) * Ahead has 480 kbps passes on Monday, Aug 15 (D63), Tuesday, Aug 16 (D14), Wednesday, Aug 17 (D14), Thursday, Aug 18 (D14), and Friday, Aug 19 (D14). There are 8 passes during the week, and overall coverage is nominal. * Behind has 480 kbps passes on Tuesday, Aug 16, Thursday, Aug 18, Friday, Aug 19, and Sunday, Aug 21, all using station 14. There are 15 passes during the week, and overall coverage is 8.1 hours above nominal. Week 34 (Aug 22-28) * Ahead has 480 kbps passes on Monday, Aug 22 (D63), Wednesday, Aug 24 (D14), Friday, Aug 26 (D63), Saturday, Aug 27 (D14), and Sunday, Aug 28 (D14). There are 11 passes during the week, and overall coverage is nominal. * Behind has a 480 kbps pass on Monday, Aug 22 using station 43. There are 14 passes during the week, and overall coverage is 5.6 hours above nominal. * Momentum dumps are expected to be scheduled sometime during the week on both spacecraft. Other * FDF would like to get a copy of the telemetry from an upcoming ESA station test in CCSDS format for testing. They would prefer that the data be routed directly to the FDF. The testing has not yet been scheduled. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 04 (185) Independence day T Jul 05 (186) Ahead: 480 kbps downlink on stations 63 and 14 Behind: 720 kbps downlink on station 63 W Jul 06 (187) Ahead: 480 kbps downlink on stations 63 and 14 T Jul 07 (188) Ahead: 480 kbps downlink on station 14 F Jul 08 (189) Ahead: 480 kbps downlink on station 63 Behind: 720 kbps downlink on station 43 S Jul 09 (190) S Jul 10 (191) Behind: 720 kbps downlink on station 63 ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 11 (192) T Jul 12 (193) Behind: Momentum dump, 19:30 UT Ahead: 480 kbps downlink on station 43 Behind: 720 kbps downlink on stations 43 and 63 W Jul 13 (194) Behind: Switch downlink rate to 160 kbps, 480 kbps for 70 m HGA calibration, Ahead: 15:00 UT, Behind: 16:00 UT T Jul 14 (195) Ahead: Momentum dump, 15:00 UT Behind: 480 kbps downlink on station 43 F Jul 15 (196) Behind: 480 kbps downlink on stations 43 and 63 S Jul 16 (197) Ahead: 480 kbps downlink on station 43 S Jul 17 (198) Behind: 480 kbps downlink on station 43 Notes: * Dawn expected to achieve orbit about Vesta around Jul 16. ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 18 (199) Ahead: 480 kbps downlink on station 14 T Jul 19 (200) Ahead: 480 kbps downlink on station 14 W Jul 20 (201) Ahead: 480 kbps downlink on station 14 T Jul 21 (202) Ahead: 480 kbps downlink on station 14 Behind: 480 kbps downlink on station 63 F Jul 22 (203) Behind: 480 kbps downlink on station 63 Behind: Test of 135 degree roll for comet Elenin, 12-14 UT S Jul 23 (204) Behind: 480 kbps downlink on station 63 S Jul 24 (205) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 25 (206) Ahead: 480 kbps downlink on station 63 T Jul 26 (207) Ahead: SECCHI stepped calibration roll, 7:15 UT Behind: SECCHI stepped calibration roll, 9:00 UT Ahead: 480 kbps downlink on station 63 W Jul 27 (208) Ahead: 480 kbps downlink on station 63 T Jul 28 (209) F Jul 29 (210) Behind: 480 kbps downlink on stations 14 and 43 S Jul 30 (211) S Jul 31 (212) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Aug 01 (213) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Ahead: 480 kbps downlink on station 14 T Aug 02 (214) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Ahead: 480 kbps downlink on station 14 W Aug 03 (215) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Ahead: 480 kbps downlink on station 63 T Aug 04 (216) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Ahead: 480 kbps downlink on station 43 Behind: 480 kbps downlink on station 14 F Aug 05 (217) Behind: 135 degree roll to observe comet Elenin, 10-12 UT Behind: 480 kbps downlink on station 43 S Aug 06 (218) Behind: 135 degree roll to observe comet Elenin, 8-10 UT S Aug 07 (219) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Notes * Aug 1-12 Behind: Spacecraft rolls to observe comet Elenin ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 08 (220) Behind: 135 degree roll to observe comet Elenin, 8-10 UT T Aug 09 (221) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Behind: 480 kbps downlink on stations 14 and 63 W Aug 10 (222) Behind: 135 degree roll to observe comet Elenin, 8-10 UT T Aug 11 (223) Behind: 135 degree roll to observe comet Elenin, 8-10 UT Behind: 480 kbps downlink on station 63 F Aug 12 (224) Behind: 135 degree roll to observe comet Elenin, 10-12 UT Ahead: 480 kbps downlink on station 14 S Aug 13 (225) Ahead: 480 kbps downlink on station 63 S Aug 14 (226) Ahead: 480 kbps downlink on station 14 Notes * Aug 1-12 Behind: Spacecraft rolls to observe comet Elenin ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 15 (227) Ahead: 480 kbps downlink on station 63 T Aug 16 (228) Ahead: 480 kbps downlink on station 14 Behind: 480 kbps downlink on station 14 W Aug 17 (229) Ahead: 480 kbps downlink on station 14 T Aug 18 (230) Ahead: 480 kbps downlink on station 14 Behind: 480 kbps downlink on station 14 F Aug 19 (231) Ahead: 480 kbps downlink on station 14 Behind: 480 kbps downlink on station 14 S Aug 20 (232) S Aug 21 (233) Behind: 480 kbps downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 22 (234) Ahead: 480 kbps downlink on station 63 Behind: 480 kbps downlink on station 43 T Aug 23 (235) W Aug 24 (236) Ahead: 480 kbps downlink on station 14 T Aug 25 (237) F Aug 26 (238) Ahead: 480 kbps downlink on station 63 S Aug 27 (239) Ahead: 480 kbps downlink on station 14 S Aug 28 (240) Ahead: 480 kbps downlink on station 14 ------------------------------------------------------------------------------- Upcoming events: 2012: * Jan 11 Both: HGA calibration * Jul DAWN - Vesta departure * Jul 11 Both: HGA calibration * Nov 4 Behind: Switch downlink rate to 120 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * May 3 Ahead: Switch downlink rate to 120 kbps * Dec 12 Ahead: Mercury transit 2014: * Jan 20 Behind: End use of 480 kbps on 70 m DSN subnet * Apr 21 Behind: Resume use of 480 kbps on 70 m DSN subnet * Apr 29 Behind: Mercury transit * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet 2015: * Feb DAWN - Ceres arrival * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar 17 - Jul 14 (TBC) Ahead: Spacecraft behind Sun * Jul 2 Behind: Resume use of 480 kbps on 70 m DSN subnet * Aug 25 - Oct 19 (TBC) Behind: Spacecraft behind Sun * Sep 25 Behind: End use of 480 kbps on 70 m DSN subnet * Jul DAWN - End of nominal mission 2016: * Apr 3 Behind: Resume use of 480 kbps on 70 m DSN subnet 2017: * Jul 11 Ahead: Switch downlink rate to 160 kbps * Jul 22 Behind: Switch downlink rate to 160 kbps 2018: * Mar 5 Ahead: Mercury transit