STEREO Weekly Meeting Minutes for 2007-02-06 (Week 06) ANNOUNCEMENTS ------------- * APL network will down for maintenance on Saturday, Feb 17th, between 12:00 to 22:00. Instruments will not be able to command from their POCs or receive realtime telemetry. No APL email. STEREO data server will be down. The backup modem pool will not work. INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 5 * Several days of intermittent downlink problems on Ahead spacecraft using DSN station 45. The cause is under investigation. All data has been recovered. * Station 25 misconfigured on Feb 1 for 200 W uplink power instead of 20 kW. The situation was corrected, and all pass objectives were met. * SECCHI HI stray light offpoint on Ahead, Jan 30. * SWAVES calibration rolls on Behind Jan 29 and 31. * Behind switched to HGA and 20 kW uplink power, Jan 31. * SECCHI-driven GT calibration maneuvers on Ahead and Behind, Feb 3. * SECCHI-driven EUVI calibration off-point on Behind, Feb 4 Week 6 * JPL routine patching tomorrow after Ahead pass. Duration is 2 hours. * Spacecraft-driven SECCHI EUVI flat field off-point on Behind, Feb 5. Last part of event macro got overwritten due to commanding error. Did not affect the data, only the HGA autotrack feature. This was corrected during the pass. * Today, SECCHI stepped calibration roll on Behind. * Some tracks this week are very early in the morning. There are 3 unattended tracks on Behind. Future unattended tracks are shortened to 4 hours. Week 7 * EUVI flat field off-points on Ahead: SECCHI-driven off-point on Feb 13 at 12:35 UT, and S/C-driven on Feb 15 at 08:00 UT. * APL network maintenance Feb 17th. See announcement above for details. * Six unattended tracks on Behind, about 4 hours each. There will be no attended track for Behind on Sunday, Feb 18th. Week 8 * SECCHI stepped calibration roll on Ahead, Feb 20 at 14:25 UT. * Discontinue reverse polarization for Ahead on Feb 20, and for Behind on Mar 7 * Four unattended tracks on Behind. * Lunar transit as seen from Behind, 06:56 to 18:52. Mission Operations is still checking to see whether any of the GT diodes will be obscured. SECCHI will practice for the lunar transit on Feb 14th. This practice will include temporarily disregarding one of the diodes to simulate the potential obscuration of the Moon. That part of the test will occur during the pass, so that it can be observed in realtime. * Momentum is building up more slowly on Ahead and Behind than was originally anticipated. Mission Operations will continue to keep an eye on it. The dates of the next momentum dumps are not currently known. Week 9 * HGA calibration maneuver on Ahead, Feb 28. Spacecraft will be rolled between +/- 2 degrees, with corresponding slewing of the HGA. Other * SECCHI is requested that the HI 180 degree and 90/270 degree calibration rolls be scheduled during the second week of March (week 11). The scripts for these rolls will need to be adjusted to take into account the roll angle of the spacecraft on the observation date. * Mission Operations noticed an unusual roll error on the Ahead spacecraft on Jan 31. Just subsequent to this, the jitter suddenly improved from about 1 to 0.4 arc seconds. The question was raised whether any instrument activities could have been responsible for this, but no special activities could be identified. * SECCHI requests that Mission Operations look into resizing their SSR1 and SSR2 partitions. The SSR1 partition (currently 80% of the total) is used for their synoptic data, which should be completely downloaded every day, while SSR2 (currently 20%) is used for special event data. The SECCHI images do not compress as much as originally anticipated. With the current allocations, the synoptic buffer will overflow when the station passes are signficantly longer than 24 hours apart--they can be as much as 36 hours apart. Reallocating some of the special event partition into the synoptic partition will ameliorate this problem. A smaller special event partition is still compatible with the primary science goal of this buffer, which is to store data taken in the first few hours just before a CME event is triggered by the COR2 telescope. Mission Operations is looking into what can be done. * Discussion was held about how commands sent before the track are treated by the commanding queues. Commands sent up to 1 hour before the beginning of track (BOT) will be queued up and sent up to the spacecraft starting at about 30 minutes into the track. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 05 (036) Behind: SECCHI EUVI calibration off-point, S/C driven, 6:00 UT T Feb 06 (037) Behind: SECCHI stepped calibration roll, 06:50 UT W Feb 07 (038) T Feb 08 (039) F Feb 09 (040) S Feb 10 (041) S Feb 11 (042) ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 12 (043) T Feb 13 (044) Ahead: SECCHI EUVI Flat Field Offpoint, SECCHI driven, 12:35 UT W Feb 14 (045) Behind: Test of SECCHI lunar transit observations T Feb 15 (046) Ahead: SECCHI EUVI Flat Field Offpoint, S/C driven, 08:00 UT F Feb 16 (047) S Feb 17 (048) S Feb 18 (049) Notes: * APL network will be down for maintenance Feb 17, 12:00-22:00. ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 19 (050) T Feb 20 (051) Ahead: SECCHI Stepped Cal. Roll, 14:25 UT W Feb 21 (052) T Feb 22 (053) F Feb 23 (054) S Feb 24 (055) S Feb 25 (056) Behind: Lunar transit, 06:56-18:52 UT ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 26 (057) T Feb 27 (058) W Feb 28 (059) Ahead: HGA calibration roll T Mar 01 (060) F Mar 02 (061) S Mar 03 (062) S Mar 04 (063) -------------------------------------------------------------------------------