STEREO Weekly Meeting Minutes for 2007-04-03 (Week 14) ANNOUNCEMENTS ------------- INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 13 * Average retrieved data volume was 7.1 gigabits for Ahead, and 9.4 gigabits for Behind. * The SECCHI partitions on both spacecraft were resized on day 85 to move space from their special event partition to their synoptic partition. This went smoothly. * An autonomy rule change for the IMPACT SIT high temperature limit was uploaded to both spacecraft on day 86. * The IMPACT LET firmware upload was successfully completed on both spacecraft on day 88. * There was a power loss at ground station 26 during the Behind pass on day 86. It took about an hour to get the station back online, leading to loss of data. This loss occured after the partitions had been downloaded. * The ephemeris upload on Behind at the day 89/90 roll-over went fine. Week 14 * HGA calibrations being performed on both spacecraft today. The calibration on Behind occured this morning. This was the first fully successful HGA calibration on Behind, with the DSN in the optimal configuration. * Momentum dump scheduled for Behind on Thursday. The spacecraft will remain on the HGA during the dump. Preparations for the dump start at 13:00 UT. The dump itself starts at 14:00 UT, and is less than 5 minutes in duration. Week 15 * Momentum dump on Ahead on Thursday at 19:00 UT. Week 16 * SECCHI stepped calibration roll on Behind on day 107. * SECCHI-driven offpoints on both spacecraft on day 109. * New point-of-presence for IONET link will be installed in the MOC on day 109. Week 17 * Nothing unusual. Week 18 * Begin unattended track operations April 30. One attended track on Wednesday, which will be the normal weekday for attended tracks. * Begin SECCHI campaign, days 124-137. The tracks are roughly 12 hours apart on both spacecraft. Other * Three launches are scheduled over the summer, Dawn, Selene, and Phoenix. These could affect DSN schedules. * The MOC has determined that the intermittent gaps in the SECCHI Special Event buffer telemetry is caused by the fact that SECCHI is still writing to the buffer as it is being read out, overwriting the telemetry that the spacecraft is sending down. The write pointer pushes the read pointer ahead of it, so when the write is faster than the read, packets get skipped. The SECCHI team is still examining how they might change the operation of the Special Event partition to maximize their science return. * The IMPACT team discussed sudden jumps they have seen in the magnetometer offset. The first of these occured on January 5 at 11:54 UT on the Ahead spacecraft. They ask the other instrument teams to check to see if they see anything unusual in their data or operations at this time. * The SWAVES team discussed the unusual spikes they've been seeing in their data on Ahead during the month of February. Spikes have also been seen in the magnetometer data and in the STE-U, which has it's door closed. On Friday, day 82, there were some G&C glitches noticed by the SECCHI team which appears to have a correlation with SWAVES spikes. * The first images of the day for the Behind HI-1 instrument shows strange behavior on March 28 and 29. These images are an on-board sum of multiple exposures over the first half hour of each day. Every star image is split into 3 images separated by about 4-5 arc minutes in a roughly equilateral triangle as if the pointing changed during the observation. The SECCHI teams asks if anybody has seen any behavior which could cause this. The G&C team doesn't see anything which appears to be relevant. * SECCHI will be taking special EUVI observation over the weekend (April 7,8). They'll be replacing their regular 171 images with exposures which are about 10 times deeper. These images will have a 20 minute cadence. * SECCHI will use the Special Event partition in a different mode several days next week. Instead of writing to the partition 24 hours a day, and letting the older data get overwritten, the SECCHI team will pick a 4-6 hour period each day, and only write during that period. This is to support campaigns with SOHO and Hinode. It would also avoid the intermittent gap problem. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Apr 02 (092) T Apr 03 (093) Both: HGA calibration W Apr 04 (094) T Apr 05 (095) Behind: Momentum dump F Apr 06 (096) S Apr 07 (097) EUVI 171 images with deeper exposure S Apr 08 (098) EUVI 171 images with deeper exposure Notes: * SUMER/Hinode campaign, Mar 13-Apr 30 ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 09 (099) T Apr 10 (100) SECCHI/SUMER/Hinode campaign, 11-17 UT W Apr 11 (101) SECCHI/SUMER/Hinode campaign, 11-17 UT T Apr 12 (102) Ahead: Momentum dump F Apr 13 (103) SECCHI/SUMER/Hinode campaign, 11-17 UT S Apr 14 (104) S Apr 15 (105) Notes: * SUMER/Hinode campaign, Mar 13-Apr 30 ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 16 (106) T Apr 17 (107) Behind: SECCHI Stepped Roll 08:35 UT W Apr 18 (108) T Apr 19 (109) Behind: SECCHI GT Offpoint 10:05 UT Ahead: SECCHI GT Offpoint 15:20 UT F Apr 20 (110) S Apr 21 (111) S Apr 22 (112) Notes: * SUMER/Hinode campaign, Mar 13-Apr 30 ------------------------------------------------------------------------------- Scheduled activities for Week 17: M Apr 23 (113) T Apr 24 (114) W Apr 25 (115) T Apr 26 (116) F Apr 27 (117) S Apr 28 (118) S Apr 29 (119) Notes: * SUMER/Hinode campaign, Mar 13-Apr 30 ------------------------------------------------------------------------------- Scheduled activities for Week 18: M Apr 30 (120) Begin unattended tracks T May 01 (121) W May 02 (122) T May 03 (123) F May 04 (124) Start of SECCHI campaign S May 05 (125) S May 06 (126) Notes: * SUMER/Hinode campaign, Mar 13-Apr 30 -------------------------------------------------------------------------------