STEREO Weekly Meeting Minutes for 2019-07-30 (Week 31) ANNOUNCEMENTS ------------- * IMPACT announces that the STEREO Data Server at UCLA will be down for a month. Alternate sources for these data are being identified. * The SSC reports that all ftp servers at NASA will have to be shut down by July 31. Instrument teams that get their data via ftp from the stereoftp server will have to change their scripts to get the data from https://stereo-ssc.nascom.nasa.gov. A new procedure for updating SolarSoft is in beta testing. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. * Four years after the initial loss of communications anomaly with the Behind observatory, NASA has directed to cease periodic recovery operations with the last support on October 17, 2018. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 30 (Jul 22-28) * On day 204 (Jul 23), during the DSS-43 support for Ahead, turbo decoder lock was lost briefly at 0731z. This anomaly resulted in the loss of 37 frames of SSR data. * On day 205 (Jul 24), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently at 0025z and 0031z due to heavy rain at the Goldstone complex. This anomaly resulted in the loss of 26,094 frames of SSR data, equivalent to about 5 minutes worth of data. See DR# G120377 for more information. * On day 208 (Jul 27), during the DSS-43 support for Ahead, receiver lock was lost from 0350z and 0357z due to the Canberra link operator accidentally rebooting the Downlink Channel. This anomaly resulted in the loss of seven minutes of real-time and SSR data. See DR #C114395 for more information. * The average daily science data return for Ahead was 5.9 Gbits during this week. Week 31 (Jul 29-Aug 4) * The 49th SECCHI stepped calibration roll was successfully carried out yesterday (Jul 29). * Ahead has nine passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, one at 360 kbps, and two at 240 kbps. Week 32 (Aug 5-11) * The 121st momentum dump on Ahead is scheduled for Monday, Aug 5, with ignition at 20:30 UT. This will be the 40th momentum dump without using the gyros. * On Tuesday, Aug 6, the data rates for the low gain antenna on Ahead will increase to 500 bps for uplink, and 1000 bps for downlink, when using a 70 meter station. * Ahead has ten passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, one at 360 kbps, and one at 240 kbps. Week 33 (Aug 12-18) * Late on Tuesday, Aug 13, there will be a project interface test of software and procedures for three links per operator at the DSN. There will be no SSR playback or instrument commanding during the test. This will occur on a DSS-14 track, 21:15-00:15 UTC. * Ahead has eleven passes during the week, and overall coverage in nominal. There are seven passes at 720 kbps and four at 240 kbps. Week 34 (Aug 19-25) * On Tuesday, Aug 20, there will be a return-to-service demo track with DSS-63, 16:50-19:50 UTC. There will be no SSR playback and no instrument commanding. * Ahead has twelve passes during the week, and overall coverage in nominal. There are nine passes at 720 kbps, two at 360 kbps, and one at 240 kbps. Week 35 (Aug 26-Sep 1) * The third SECCHI support campaign for Parker Solar Probe starts Wednesday, Aug 28, and extends to Sep 7. * Ahead has twelve passes during the week, and overall coverage in nominal. There are ten passes at 720 kbps and two at 360 kbps. Week 36 (Sep 2-8) * Monday, Sep 2, is Labor Day, which is a holiday at APL. * The third SECCHI support campaign for Parker Solar Probe ends Saturday, Sep 7. * Ahead has eight passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, and three at 360 kbps. Week 37 (Sep 9-15) * Ahead has nine passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, two at 360 kbps, and one at 240 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 29 (210) Ahead: SECCHI stepped calibration roll, 12:10 UT T Jul 30 (211) W Jul 31 (212) T Aug 01 (213) F Aug 02 (214) S Aug 03 (215) S Aug 04 (216) ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 05 (217) Ahead: Momentum dump, 20:30 UT T Aug 06 (218) W Aug 07 (219) T Aug 08 (220) F Aug 09 (221) S Aug 10 (222) S Aug 11 (223) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 12 (224) T Aug 13 (225) Ahead: Project interface test with station 14 W Aug 14 (226) T Aug 15 (227) F Aug 16 (228) S Aug 17 (229) S Aug 18 (230) ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 19 (231) T Aug 20 (232) Ahead: Return-to-service track with station 63 W Aug 21 (233) T Aug 22 (234) F Aug 23 (235) S Aug 24 (236) S Aug 25 (237) ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 26 (238) T Aug 27 (239) W Aug 28 (240) Ahead: Begin SECCHI observations for Parker Solar Probe T Aug 29 (241) F Aug 30 (242) S Aug 31 (243) S Sep 1 (244) Notes: * Parker Solar Probe perihelion pass, Aug 28-Sep 7 ------------------------------------------------------------------------------- Scheduled activities for Week 36: M Sep 2 (245) Labor Day holiday T Sep 3 (246) W Sep 4 (247) T Sep 5 (248) F Sep 6 (249) S Sep 7 (250) Ahead: End SECCHI observations for Parker Solar Probe S Sep 8 (251) Notes: * Parker Solar Probe perihelion pass, Aug 28-Sep 7 ------------------------------------------------------------------------------- Scheduled activities for Week 37: M Sep 09 (252) T Sep 10 (253) W Sep 11 (254) T Sep 12 (255) F Sep 13 (256) S Sep 14 (257) S Sep 15 (258) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * Nov 4 Ahead: Close approach of Parker Solar Probe * Dec 26 Parker Solar Probe Venus flyby 2020: * Jan 24-Feb 4 Parker Solar Probe perihelion pass * May Behind: Switch downlink rate to 360 kbps for 34 meter * Jun Ahead: Switch downlink rate to 360 kbps for 34 meter * Jun Behind: Switch downlink rate to 480 kbps for 34 meter * Jun 2-13 Parker Solar Probe perihelion pass * Jul 11 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter * Sep 22-Oct 2 Parker Solar Probe perihelion pass 2021: * Jan 13-23 Parker Solar Probe perihelion pass * Feb 20 Parker Solar Probe Venus flyby * Apr 25-May 4 Parker Solar Probe perihelion pass * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter * Aug 5-15 Parker Solar Probe perihelion pass * Oct 16 Parker Solar Probe Venus flyby * Nov 17-26 Parker Solar Probe perihelion pass 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Mar 13-23 Parker Solar Probe perihelion pass * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth * Aug 21 Parker Solar Probe Venus flyby * Sep 23-Oct 3 Parker Solar Probe perihelion pass * Dec 25-Jan 3 Parker Solar Probe perihelion pass 2024: * Mar 26-Apr 4 Parker Solar Probe perihelion pass * Jun 26-Jul 5 Parker Solar Probe perihelion pass * Sep 26-Oct 5 Parker Solar Probe perihelion pass * Nov 6 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Dec 20-29 Parker Solar Probe perihelion pass 2025: * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit