STEREO Weekly Meeting Minutes for 2009-07-07 (Week 28) ANNOUNCEMENTS ------------- * The STEREO Science Center website is temporarily unavailable. A minimal website has been brought up with some, but not all, of the functionality of the original website. All (or almost all) data should be available now through the website, or through the anonymous ftp server at stereoftp.nascom.nasa.gov. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 27 * Station 63 suffered a drive anomaly at 02:58 UT during the Ahead pass on day 186 (Jul 5). The uplink was reswept. The problem reoccurred at 05:17, and resolved without needing a resweep. This resulted in a few minutes of data loss for days 185 and/or 186 (July 4-5). * The tenth high gain antenna calibrations took place on Behind at 17:00 UT on day 182 (Jul 1), and for Ahead at 14:00 UT on day 183 (Jul 2). * The average daily SSR downlink was 6.1 gigabits on Ahead, and 6.3 gigabits on Behind. * Most internet services have been restored at APL. Week 28 * The RF server went down yesterday (Jul 6), resulting in no realtime or monitor data. All SSR data was received. The server has since come back online. * SECCHI uploaded a new image processor patch on Behind yesterday (Jul 6), and on Ahead this morning (Jul 7). This is to improve the HI2 beacon images. * The sixth HI 180 degree rolls are scheduled for tomorrow (Jul 8), at 01:50 UT on Ahead, and 15:50 UT on Behind. There was some discussion about the new active region which is just on the limb as seen from Behind. It was decided that the HI rolls should proceed as planned. * The Thursday (Jul 9) pass for Ahead is only 3.6 hours, but is followed by another pass on station 34. * The subreflector on station 15 is currently stuck at 45, leading to a loss in signal strength. This station will be used for both spacecraft on day 192 (Jul 11). A change in the configuration code is required. Week 29 * No significant activities planned. Week 30 * The 17th momentum dump on Behind is scheduled for Thursday, day 204 (Jul 23), with ignition at 23:45 UT. Week 31 * An early momentum dump will be carried out on Ahead on day 209 (Jul 28), with ignition starting at 12:30 UT. Other * The G&C update, and associated reset, has been scheduled for Ahead on Aug 4 at 9:40 UT, with a backup date on Aug 5. This activity will be carried out on station 14, which is a 70 meter dish. The tracks are 8 hours long. There is also a 3 hour support before the activity. As with the previous reset on Behind, it is planned to power down the instruments with time-tagged commands, 5 minutes apart. The round-trip light travel time will be around 15 minutes, which is about 2 minutes longer than during the Behind reset. This will make the recovery time longer. * There was some discussion about the need for a guard to let instrument teams in to APL during the early hour passes for the reset activity. * SECCHI HI 180 degree rolls are planned until each spacecraft passes the Lagrange point. * The Herschel sounding rocket flight is scheduled for Jul 21, at 19:10 UT. * The SUMI sounding rocket flight has been postponed until next spring. * A total solar eclipse will occur on Jul 22. It will pass through China between 01:10 and 01:40 UT. * Permission is needed to install software on instrument POC workstations. Without this permission, the workstations will not have access to the internet. There was some discussion as to how this would be handled for some of the instrument teams. * Immediately after the Ahead reset, the pass durations will increase to six hours. Soon after this the telemetry rates will be dropping to 360 kbps on both spacecraft. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 06 (187) T Jul 07 (188) W Jul 08 (189) HI 180 degree rolls, Ahead: 01:50, Behind 15:50 UT T Jul 09 (190) F Jul 10 (191) S Jul 11 (192) S Jul 12 (193) ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 13 (194) T Jul 14 (195) W Jul 15 (196) T Jul 16 (197) F Jul 17 (198) S Jul 18 (199) S Jul 19 (200) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 20 (201) T Jul 21 (202) ICAL14, Herschel sounding rocket launch, 19:10 UT http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf W Jul 22 (203) Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009.html T Jul 23 (204) Behind: Momentum dump, 23:45 UT F Jul 24 (205) S Jul 25 (206) S Jul 26 (207) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 27 (208) T Jul 28 (209) Ahead: Momentum dump, 12:30 UT W Jul 29 (210) T Jul 30 (211) Ahead: SECCHI HI 180 degree roll F Jul 31 (212) S Aug 01 (213) S Aug 02 (214) ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: Jun 15-19, Jul 13-17, Aug 17-21, Sep 14-18, Oct 12-16, Dec 14-18 SECCHI Stepped calibration rolls Ahead: Sep 2, Nov 24 Behind: Sep 22, Dec 22 * Mar 16-Sep LASCO C2pB for Tomography Reconstruction * Mar 27-... JOP 222, Origin of SEPS, Target of opportunity * Aug 4 Ahead: Spacecraft reset for G&C update * Aug 5 Behind: SECCHI HI 180 degree roll * Aug 10 Both: Begin 6 hour daily DSN tracks * Aug 13 Ahead: SECCHI HI 180 degree roll * Aug 26 Behind: SECCHI HI 180 degree roll * Aug 17 Ahead: Switch downlink rate to 360 kbps * Sep 8 Behind: Switch downlink rate to 360 kbps * Sep 10 Ahead at L4 Lagrange point * Sep 27-Oct 27 JOP 224, Solar Tomography with Minimal Solar Rotation * Sep 29 Messenger - Mercury fly-by * Oct 8,15 EIT shutterless (TBC) * Oct 21 Behind: SECCHI HI 180 degree roll * Oct 26 Behind at L5 Lagrange point * Nov 1-Dec 15 SUMER campaign (TBC) * Nov 30 Behind: Begin 7 hour daily DSN tracks * Dec 7 Behind: Switch downlink rate to 240 kbps 2010: SECCHI Stepped calibration rolls Ahead: Feb 23, May 18, Aug 10, Nov 2 Behind: Apr 6, Jul 13, Oct 12 * Jan 6 Both: HGA calibration * Jan 7,15 EIT shutterless (TBC) * Spring (TBD) SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * Apr 19 Ahead: Begin 7 hour daily DSN tracks * Apr 26 Ahead: Switch downlink rate to 240 kbps * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Sep 7 Both: Begin 8 hour daily DSN tracks * Sep 13 Both: Switch downlink rate to 160 kbps * Nov 15 Behind: Switch downlink rate to 120 kbps 2011: * Jan 12 Both: HGA calibration * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul 13 Both: HGA calibration * Aug DAWN - Vesta arrival * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 11 Both: HGA calibration * May DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug Both: Switch downlink rate to 30 kbps 2013: 2014: 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission