STEREO Weekly Meeting Minutes for 2012-10-09 (Week 41) ANNOUNCEMENTS ------------- * Network maintenance at the MOC will be performed on Monday, Oct 15. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 40 (Oct 1-7) * On day 275 (Oct 1), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 1343z and again at 1441z due to antenna elevation encoder errors. This anomaly resulted in the loss of 357 frames of SSR data. See DR# G113270 for more information. * On day 277 (Oct 3), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0728z and again at 0903z. This anomaly resulted in the loss of 13 frames of SSR data. See DR# N108462 for more information. * On day 279 (Oct 5), during the DSS-25 support for Ahead, turbo decoder lock was lost briefly at 1713z. This anomaly resulted in the loss of one frame of SSR data. See DR# N108463 for more information. * On day 277 (Oct 3), the turbo encoded space weather test with Ahead was conducted successfully with the Bochum, Germany station. * On day 276 (Oct 2), during the DSS-55 support for Behind, turbo decoder lock was lost briefly at 1403z. This anomaly resulted in the loss of one frame of SSR data. See DR# N108461 for more information. * On day 278 (Oct 4), during the DSS-32 (New Norcia) support for Behind, turbo decoder lock was lost intermittently beginning at 1047z through 1144z due to weather. This anomaly resulted in the loss of 39 frames of SSR data. This anomaly is being investigated with ESA. * On day 281 (Oct 7), during the DSS-25 support for Behind, turbo decoder lock was lost briefly 2024z, 2135z, and again at 282-0023z. This anomaly resulted in the loss of three frames of SSR data. See DR# N108465 for more information. * On day 275 (Oct 1), IMPACT conducted real-time commanding on Behind to load a flight software patch to correct a bit flip in RAM that affected PLASTIC. * On day 278 (Oct 4), the turbo encoded space weather test was conducted successfully on Behing with the Bochum, Germany station. * The average daily SSR playback volume during the week was 5.0 gigabits for Ahead, and 4.9 gigabits for Behind. Week 41 (Oct 8-14) * SWAVES will be performing a flight software load on both spacecraft, starting with Ahead on Friday, Oct 12, and continuing through the weekend. This load will correct a bug found with a signed integer overflow condition after long periods of uptime. The SWAVES GSE at the MOC will also be refreshed. * Ahead has 70 meter passes on Monday, Oct 8 (D14), Tuesday, Oct 9 (D14), Wednesday, Oct 10 (D14), Friday, Oct 12 (D14), Saturday, Oct 13 (D63, D43), and Sunday, Oct 14 (D63). There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Tuesday, Oct 9 (D14), Thursday, Oct 11 (D43 at 720 kbps), Friday, Oct 12 (D43), and Sunday, Oct 14 (D63, D43). The D34 pass on Friday Oct 12 will be stepped to 240 kbps. There are 9 passes during the week, and overall coverage is nominal. Week 42 (Oct 15-21) * Maintenance will be performed on the restricted IONET backup link on Monday, Oct 15, between tracks. It is expected that the instrument teams will need to reconnect after this activity. * Ahead has 70 meter passes on Monday, Oct 15 (D14), Wednesday, Oct 17 (D63), Saturday, Oct 20 (D63, D14), and Sunday, Oct 21 (D63). There are 14 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Oct 15 (D43, D14), Tuesday Oct 16 (D14), Wednesday, Oct 17 (D63), Thursday, Oct 18 (D14), Saturday, Oct 20 (D14) and Sunday, Oct 21 (D63). There are 8 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Friday, Oct 19. Week 43 (Oct 22-28) * The second refresh of the IMU EEPROMs will be performed during the week. The EEPROMs for IMU1 on both spacecraft will be refreshed on Wednesday, Oct 24, and those for IMU2 on both spacecraft will be refreshed on Thursday, Oct 25. * Ahead has 70 meter passes on Monday, Oct 22 (D63, D14), Tuesday, Oct 23 (D14), Wednesday, Oct 24 (D14), Friday, Oct 26 (D63), Saturday, Oct 27 (D63), and Sunday, Oct 28 (D63, D43 at 720 kbps). There are 14 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Tuesday, Oct 23 (D63), Wednesday, Oct 24 (D63), Thursday, Oct 25 (D63), Friday, Oct 26 (D43), and Sunday, Oct 28 (D63). There are seven passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Monday, Oct 22. * Oct 25 is the sixth launch anniversary of STEREO. Week 44 (Oct 29-Nov 4) * The 51st momentum dump on Ahead is scheduled for Tuesday, Oct 30, with ignition at 16:00 UT. * Daylight savings time ends in the U.S. on Sunday, Nov 4. * Ahead has 70 meter passes on Monday, Oct 29 (D14), Tuesday, Oct 30 (D14), Wednesday, Oct 31 (D14), Friday, Nov 2 (D14), Saturday, Nov 3 (D63, D43), and Sunday, Nov 4 (D63). There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Oct 29 (D14), Tuesday, Oct 30 (D63, D14), Thursday, Nov 1 (D63), Friday, Nov 2 (D43), Saturday, Nov 3 (D14), and Sunday, Nov 4 (D14). There are 9 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Friday, Nov 2. Week 45 (Nov 5-11) * The nominal telemetry rate for Behind with 34 meter stations will drop from 160 kbps to 120 kbps starting Monday, Nov 5. The telemetry rate for high elevation passes will drop from 240 kbps to 160 kbps. The same change will be made for Ahead next spring. * The 46th momentum dump on Behind is scheduled for Tuesday, Nov 6, starting at 21:00 UT. * Ahead has 13 passes during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Nov 5 (D63), Tuesday, Nov 6 (D14), Wednesday, Nov 7 (D14), Friday, Nov 9 (D63), and Saturday, Nov 10 (D63, D43 at 720 kbps). The station 55 pass on Tuesday, Nov 6 will be carried out at 240 kbps. An ESA New Norcia pass is scheduled for Sunday, Nov 11. * Behind has 8 tracks during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Nov 5 (D63), Tuesday, Nov 6 (D14), Wednesday, Nov 7 (D43 at 720 kbps), Thursday, Nov 8 (D63), Friday, Nov 9 (D63), Saturday, Nov 10 (D14), and Sunday, Nov 11 (D14). The station 34 pass on Friday, Nov 9, will be the first pass to be carried out at 120 kbps, and the only one scheduled during the week. Other * On day 271 (Sep 27), during the DSS-63 support for Behind, the MOC did not receive the appropriate IDR files from the DCD beginning at 1534z, which caused a six hour gap in the SSR data. The problem was related to a system upgrade, which DSN has identified and fixed. DSN regenerated the IDR files on DOY-277 (Oct 3) and all telemetry was recovered. See DR# N108460 for more information. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 08 (282) T Oct 09 (283) W Oct 10 (284) T Oct 11 (285) F Oct 12 (286) S Oct 13 (287) S Oct 14 (288) ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 15 (289) T Oct 16 (290) W Oct 17 (291) T Oct 18 (292) F Oct 19 (293) S Oct 20 (294) S Oct 21 (295) ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 22 (296) T Oct 23 (297) W Oct 24 (298) T Oct 25 (299) F Oct 26 (300) S Oct 27 (301) S Oct 28 (302) ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 29 (303) T Oct 30 (304) Ahead: Momentum dump, 16:00 UT W Oct 31 (305) T Nov 01 (306) F Nov 02 (307) S Nov 03 (308) S Nov 04 (309) End of daylight savings time in U.S. ------------------------------------------------------------------------------- Scheduled activities for Week 45: M Nov 05 (310) Behind: Switch downlink rate to 120 kbps T Nov 06 (311) Behind: Momentum dump, 21:00 UT W Nov 07 (312) T Nov 08 (313) F Nov 09 (314) S Nov 10 (315) S Nov 11 (316) ------------------------------------------------------------------------------- Upcoming events: 2012: * 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 * Jul Juno arrival at Jupiter 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