STEREO Weekly Meeting Minutes for 2011-10-04 (Week 40) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 39 (Sep 26 - Oct 2) * On day 270 (Sep 27), in-situ instruments SSR partitions on Ahead began overwriting due to insufficient track coverage. Specifically, IMPACT overwrote for 54 minutes beginning at 270-1324z, PLASTIC overwrote for 8.1 hours beginning at 270-0612z, and SWAVES overwrote for 20 minutes beginning at 270-1358z. The primary cause of the insufficient track time was sharing the same view with many other higher priority missions. * The difference in the amount of data loss between IMPACT and PLASTIC is due to the fact that the PLASTIC telemetry rate was not reduced after the recent reboot. The telemetry rate has since been commanded back down to the correct level. * On day 270 (Sep 27), during the DSS 14 support for Ahead, telemetry lock was lost at 1346z due to the antenna brakes being set. The antenna was reset and telemetry lock was re-established at 1348z. This anomaly resulted in the loss of several minutes of SSR data for the SECCHI instrument. See DR# G111996 for more information. * On day 273 (Sep 30), during the DSS 15 support for Ahead, turbo decoder lock was lost intermittently beginning at 1154z through 1428z. This anomaly resulted in the loss of several minutes of SSR data for all instruments. See DR# N107641 for more information. * On day 274 (Oct 1), during the DSS 26 support for Ahead, real-time telemetry not received in the MOC at BOT at 1150z due to RIONet issue. After rebinding to the station real-time telemetry was received at 1455z. This anomaly resulted in the loss of 3.1 hours of real-time telemetry; however, all SSR data were recovered. * On day 270 (Sep 27), during the DSS 14 support for Behind, turbo decoder lock was lost briefly beginning at 1924z. This anomaly resulted in the loss of three frames of SSR data for all instruments. See DR# N107634 for more information. * On day 272 (Sep 29), during the DSS 15 support for Behind, telemetry lock was lost at 2202z due to a loss of connectivity to the station at the Goldstone complex. The network connection was rerouted and telemetry lock was re-established at 2210z. SSR pointers were repositioned to prevent data loss. This anomaly resulted in the loss of eight minutes of real-time telemetry. All SSR data were recovered. See DR# G112002 for more information. * On day 274 (Oct 1), during the DSS 63 support for Behind, real-time telemetry not received in the MOC at BOT at 1400z due to RIONet issue. After rebinding to the station real-time telemetry was received at 1521z. Later in the support, turbo decoder lock was lost briefly beginning at 1652z. This anomaly resulted in the loss of 1.3 hours of real-time telemetry, however, one frame of SSR data. See DR# N107643 for more information. * The average daily SSR playback volume was 4.9 gigabits for Ahead, and 4.6 gigabits for Behind. * It was initially anticipated that some data loss may occur during the week on the Behind spacecraft. However, an additional track was added on Tuesday, Sep 27 at 240 kbps, and a track on Thursday was also carried out at 240 kbps. These small tweaks to the schedule can have a big effect on data recovery. * The use of the 240 kbps rates on the 34 meter stations, and the 720 kbps rates on the 70 meter stations, are now reflected in the weekly schedules for the next several weeks. A software update will help automate this, and extend the kbps documentation farther into the future. * Progress is continuing on the use of ESA stations on both the technical front, and in terms of the paperwork. Flow testing is expected shortly. ESA support is budgeted at a total of 500 hours between STEREO and SOHO. The STEREO MOC will be requesting time to fill in specific shortfall periods. Week 40 (Oct 3-9) * Turbo decoder lock was lost briefly during the station 63 track for Ahead yesterday (Oct 3). This resulted in the loss of two frames of data. * Momentum dumps were carried out successfully on both spacecraft this morning (Oct 4). * Ahead has 70 meter passes on Monday, Oct 3 (D63), Tuesday, Oct 4 (D63), Thursday, Oct 6 (D14 and D43), Saturday, Oct 8 (D14), and Sunday, Oct 9 (D63). There are 13 passes during the week, and coverage is short about 1 hour on Thursday, Oct 6. * Behind has 70 meter passes on Monday, Oct 3 (D63), Wednesday, Oct 5 (D14), and Sunday, Oct 9 (D14). There are 11 passes during the week, and overall coverage is nominal. Week 41 (Oct 10-16) * Ahead has 70 meter passes on Monday, Oct 10 (D63), Thursday, Oct 13 (D14), Friday, Oct 14 (D63), Saturday, Oct 15 (D43), and Sunday, Oct 16 (D63 and D43). There are 13 passes during the week, and overall coverage is nominal. Two passes on Saturday will be carried out at 240 kbps because they are above 25 degrees elevation for the entire pass, and one of the Sunday 70 meter passes will be carried out at 720 kbps. * Behind has 70 meter passes on Tuesday, Oct 11 (D14 and D63), Wednesday, Oct 12 (D14), Saturday, Oct 15 (D43 at 720 kbps, and D14), and Sunday, Oct 16 (D43). There are 14 passes during the week, and overall coverage is short 2.3 hours on Friday, Oct 14, which is an improvement over the previous 4.5 hour shortfall. Week 42 (Oct 17-23) * Ahead reaches aphelion on Monday, Oct 17. The associated SECCHI stepped calibration roll is the following week. * Ahead has a 70 meter pass on Monday, Oct 17 using station 14. There are 9 passes during the week, and overall coverage is nominal. A pass on Friday will be carried out at 240 kbps. * Behind has a 70 meter pass on Thursday, Oct 20, using station 14, which will be carried out at 720 kbps. There are 13 passes during the week, and coverage is short 1.1 hours on Friday, Oct 21. The station 45 pass on Monday will be carried out at 240 kbps. Week 43 (Oct 24-30) * The 19th SECCHI stepped calibration roll will be carried out on Ahead on Wednesday, day 299 (Oct 26), starting at 08:25 UT. This will be the aphelion roll. The actual date of aphelion is day 290 (Oct 17). System momentum will be about 3 N-m-s. * Oct 26 is also the five year anniversary of the launch of STEREO. * Ahead has 70 meter passes on Monday, Oct 24 (D63), Tuesday, Oct 25 (D14), and Wednesday, Oct 26 (D14). There are 10 passes during the week, and overall coverage is nominal. Two passes on Saturday will be carried out at 240 kbps. * Behind has a 70 meter pass on Wednesday, Oct 26 using station 63. There are 12 passes during the week, and coverage is short 1.2 hours between Sunday and Monday, Oct 23-24. Week 44 (Oct 31-Nov 6) * Daylight savings time is ending in the U.S. on Nov 6 at 06:00 UT. * Ahead has 70 meter passes on Monday, Oct 31 (D14), Tuesday, Nov 1 (D14), Wednesday, Nov 2 (D63, at 720 kbps), and Saturday, Nov 5 (D43). There are 10 tracks during the week, and coverage is short 1.25 hours on Nov 6. * Behind has 70 meter passes on Wednsday, Nov 2 (D63), and Saturday, Nov 5 (D43 at 720 kbps, and D63). There are 12 passes during the week, and coverage is short 1.4 hours between Monday and Tuesday (Oct 31-Nov 1). Week 45 (Nov 7-13) * The 19th SECCHI stepped calibration roll on Behind will occur on Tuesday, Nov 8, starting at 9:25 UT. This will be the aphelion roll. The actual aphelion is the next day. System momentum is expected to be 5 N-m-s. * Ahead has 70 meter passes on Monday, Nov 7 (D14), Wednesday, Nov 9 (D63), Friday, Nov 11 (D63), Saturday, Nov 12 (D63 at 720 kbps), and Sunday, Nov 13 (D14). There are 10 passes during the week, and coverage is short 2.8 hours on Tuesday, Nov 8. The Thursday pass on station 15 will be carried out at 240 kbps. * Behind has two 70 meter passes on Saturday, Nov 12, using station D43. The first of these passes will be carried out at 720 kbps. There are 13 passes during the week, and coverage is short 2.1 hours on Friday, Nov 11. Week 46 (Nov 14-20) * The 42nd momentum dump on Ahead is scheduled for Tuesday, Nov 15, with ignition at 16:30 UT. * The 36th momentum dump on Behind is scheduled for Wednesday, Nov 16, with ignition at 22:00 UT. * There will be network re-architecture activity at APL on Saturday, Nov 19, between 7 AM to 7 PM EST (12-24 UT). The instrument teams will lose connectivity during this time. However, the IONET will be unaffected, and telemetry and commanding will be available in the MOC. IDRs will be pulled in manually. * Ahead has 70 meter passes on Monday, Nov 14 (D14), Tuesday, Nov 15 (D14), Friday, Nov 18 (D63), and Saturday, Nov 19 (D63). All but the Monday pass will be carried out at 720 kbps. There are 10 passes during the week, and coverage is short 1.75 hours on Monday, Nov 14. * Behind has 70 meter passes on Tuesday, Nov 15 (D14), Wednesday, Nov 16 (D14), and Thursday, Nov 17 (D43). There are 10 passes during the week, and overall coverage is nominal. Other * The SECCHI team raised a question about the downloading of SECCHI spaceweather telemetry from the SSR. The spaceweather telemetry is downloaded whenever there is a 70 meter station, because these passes are conducted with the 360, 480, or 720 kbps DFDs. * NOAA has asked that a test be scheduled for a test of the Turbo decoding scheme with the spaceweather beacon telemetry between DSN tracks. APL will respond to this request. * The SSC sent a message to the instrument teams concerning the proposed drop of support for the Mac/PowerPC platform by the NAIF SPICE team at APL. If this happens, the older SPICE software will continue to be supplied via SolarSoft for the Mac/PowerPC platform, while other platforms will have the upgraded software. All STEREO routines should continue to work, so long as they do not make use of new features in the later versions of SPICE. * The SSC is planning to rearrange the ancillary data products served on the SSC website by year, to better manage the data. This procedure has already been carried out for the MOC Status Reports. Remaining directories will be done on a case-by-case basis. The instrument teams have made the SSC aware of specific directories where changes are undesired, or would involve coordination with the instrument teams. Reorganization of the remaining directories will start sometime next week. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Oct 03 (276) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 63 T Oct 04 (277) Momentum dumps, Ahead: 13:30, Behind: 15:00 Ahead: 70 meter downlink on station 63 W Oct 05 (278) Behind: 70 meter downlink on station 14 T Oct 06 (279) Ahead: 70 meter downlink on stations 14 and 43 F Oct 07 (280) S Oct 08 (281) Ahead: 70 meter downlink on station 14 S Oct 09 (282) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 10 (283) Ahead: 70 meter downlink on station 63 T Oct 11 (284) Behind: 70 meter downlink on stations 14 and 63 W Oct 12 (285) Behind: 70 meter downlink on station 14 T Oct 13 (286) Ahead: 70 meter downlink on station 14 F Oct 14 (287) Ahead: 70 meter downlink on station 63 S Oct 15 (288) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on stations 43 and 14 S Oct 16 (289) Ahead: 70 meter downlink on stations 63 and 43 Behind: 70 meter downlink on station 43 ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 17 (290) Ahead: 70 meter downlink on station 14 T Oct 18 (291) W Oct 19 (292) T Oct 20 (293) Behind: 70 meter downlink on station 14 F Oct 21 (294) S Oct 22 (295) S Oct 23 (296) ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 24 (297) Ahead: 70 meter downlink on station 63 T Oct 25 (298) Ahead: 70 meter downlink on station 14 W Oct 26 (299) Ahead: SECCHI stepped calibration roll, 8:25 UT Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 63 T Oct 27 (300) F Oct 28 (301) S Oct 29 (302) S Oct 30 (303) ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 31 (304) Ahead: 70 meter downlink on station 14 T Nov 01 (305) Ahead: 70 meter downlink on station 14 W Nov 02 (306) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 63 T Nov 03 (307) F Nov 04 (308) S Nov 05 (309) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on stations 43 and 63 S Nov 06 (310) Daylight savings time ends in USA ------------------------------------------------------------------------------- Scheduled activities for Week 45: M Nov 07 (311) Ahead: 70 meter downlink on station 14 T Nov 08 (312) Behind: SECCHI stepped calibration roll, 9:25 UT W Nov 09 (313) Ahead: 70 meter downlink on station 63 T Nov 10 (314) F Nov 11 (315) Ahead: 70 meter downlink on station 63 S Nov 12 (316) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 43 (twice) S Nov 13 (317) Ahead: 70 meter downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 46: M Nov 14 (318) Ahead: 70 meter downlink on station 14 T Nov 15 (319) Ahead: Momentum dump, 16:30 UT Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 14 W Nov 16 (320) Behind: Momentum dump, 22:00 UT Behind: 70 meter downlink on station 14 T Nov 17 (321) Behind: 70 meter downlink on station 43 F Nov 18 (322) Ahead: 70 meter downlink on station 63 S Nov 19 (323) Ahead: 70 meter downlink on station 63 S Nov 20 (324) Note: * Outside access to the APL/MOC will be unavailable on Saturday, Nov 19, between 7 AM and 7 PM EST (12-24 UT) due to network re-architecture. ------------------------------------------------------------------------------- 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