STEREO Weekly Meeting Minutes for 2007-07-31 (Week 31) ANNOUNCEMENTS ------------- * Phoenix launch has been postponed to Saturday. This affects the DSN schedules, as discussed below. INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spececraft is currently operating on IMU #2. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 30 * The antenna stopped tracking at station 26 during the Ahead pass on day 207 (Jul 26). The SSR playback was restarted and no data was lost. Some SECCHI data was left on the recorder at the end of the pass. * Another station 26 problem during the Ahead pass on day 208 (Jul 27) caused a 12 minute late start. Some spacecraft data was lost, but no instrument data. * The SECCHI synoptic partition filled up during the pass, and some data was lost. The pointer was reset so that SECCHI could continue to take data. * The average daily downlink was 6.7 gigabits on Ahead, and 7.8 gigabits on Behind. * Ahead is still operating on IMU #2. * Behind had a 14 minute late acquisition on day 207 (Jul 26), and some spacecraft data was lost. The uplink was established 35 minutes late, and some instrument data was lost during the uplink acquisition. * The 4th momentum dump occured on Behind on day 206 (Jul 25). The burn started at 19:00 UT and lasted 210 seconds. PLASTIC saw a large spike in their data which took several hours to decay. Their entrance system gets turned off when the thruster warning signal is sent, and turns on again once the warning signal is turned off. SECCHI saw the warning signal appear as it was supposed to at 18:57:01, three minutes before the thruster firing, and turn off again at 19:03:52, about 20 seconds after the firing was completed. SWAVES saw similar timings. * A new autonomy rule was uploaded to Behind on day 207 to protect against invalid Guide Telescope data. After this the use of GT rates was enabled, and a significant improvement in jitter performance was seen. * SWEA-Behind turned itself off on day 205 (Jul 24) at 13:23. It was brought back up during the next pass. About 4 hours of data was lost. Performance has been fine since then. The event was possibly caused by a penetrating particle. There was a discussion of how to handle such instrument problems, and it was pointed out that the MOC is on call for these situations. * The large number of impulsive events seen by SWAVES-Ahead back in February reappeared on July 20th. It stopped for a few hours on day 207 (Jul 26) at 18 UT, but reappeared again a few hours into the next day. This coincided with a drastic drop in the local electron density. The problem is still persisting. Week 31 * The Phoenix launch data slipped from Friday to Saturday. The MOC is awaiting scheduling changes from the DSN. Most changes affect the Ahead spacecraft. The schedules for the following days could be affected: - There will be a new track for Ahead on day 215, 18:35-22:35 - The last 10 minutes of the Ahead track on day 216 will be clipped off. The track will run from 09:00-12:50. - There is a possible additional track on the Ahead spacecraft on day 217 at 04:45-08:45 if Phoenix slips again to Sunday. * GT rate usage on Ahead will be enabled tomorrow, Aug 1. This should improve jitter performance. * The Wednesday tracks will be attended this week. Week 32 * The Ahead track on day 218 (Aug 6) will be shifted from 09:00-13:00 to 10:15-14:15. There will be a station change on the Behind track on that day. * The attended track for Ahead will be Tuesday, while the Wednesday track will be attended for Behind. Week 33 * The COR2 offpoint on Behind is scheduled for 14:50-16:02 on day 226, Aug 14. The maximum offpoint will be 5 arc minutes. Other * JOP 188 ends this upcoming Sunday. JOP 194 starts August 8th. The primary SECCHI contribution to these JOPs is through their synoptic program. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 30 (211) JOP 188 continues T Jul 31 (212) W Aug 01 (213) T Aug 02 (214) F Aug 03 (215) S Aug 04 (216) S Aug 05 (217) JOP 188 ends Notes: * JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5 ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 06 (218) T Aug 07 (219) W Aug 08 (220) JOP 194 begins T Aug 09 (221) F Aug 10 (222) S Aug 11 (223) S Aug 12 (224) Notes: * Aug 8-18 JOP 194, Filament/Cavity-CME-ICME IHY-CIP campaign, (CIPs 7,21,23,51) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 13 (225) JOP 194 continues T Aug 14 (226) Behind: COR2 off-point calibration maneuver, 14:50 UT W Aug 15 (227) T Aug 16 (228) F Aug 17 (229) S Aug 18 (230) End of JOP 194 S Aug 19 (231) Ulysses ecliptic plane passage Notes: * Aug 8-18 JOP 194, Filament/Cavity-CME-ICME IHY-CIP campaign, (CIPs 7,21,23,51) ------------------------------------------------------------------------------- Upcoming events: 2007: * May 7 -Aug 10 Hinode eclipse season * Aug 6-10 SOHO Intercalibration #1 (ICAL01) * Oct 22 - Nov 2 SUMER campaign (JOPs 190,191,192,193) * Dec 2007-May 2008 Ulysses quadrature