STEREO Weekly Meeting Minutes for 2009-07-21 (Week 30) ANNOUNCEMENTS ------------- * The STEREO Science Center website is back online. There are still a few scripts that aren't working yet, but the popular image search tool http://stereodata.nascom.nasa.gov/cgi-bin/images and the STEREO orbit tool http://stereodata.nascom.nasa.gov/where/ are working again. Thanks go to our system administrator, Amy Forinash, for getting it all working again. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 29 * No significant activities were planned. * On day 196, during the DSS 25 support, about 5 minutes of SECCHI SSR image data, from APIDs 0x443 and 0x444, were not received, beginning at day 195-2325Z. As all ground station and MOC equipment was operating nominally, the cause is unknown. * The average daily SSR downlink was 5.6 gigabits on Ahead, and 6.5 gigabits on Behind. Week 30 * The 17th momentum dump on Behind is scheduled for Thursday, day 204 (Jul 23), with ignition at 23:45 UT. * The Herschel sounding rocket flight is scheduled for Jul 21, at 19:10 UT. * A total solar eclipse will occur on Jul 22. It will pass through China between 01:10 and 01:40 UT. * The SECCHI team have received no specific requests to support either the Herschel sounding rocket or the eclipse. Their default plan is to run their special event blocks during these events. Because the events are so close together, there is insufficient room to run their normal special event program for both events. Preference will be given to the eclipse, or they may split their observations into two halves to support both. Week 31 * An early momentum dump will be carried out on Ahead on day 209 (Jul 28), with ignition starting at 12:30 UT. This is to target a low momentum for the reset on the following week. * The 7th HI 180 degree roll on Ahead will take place on Wednesday, July 29, starting at 21:50 UT. Week 32 * The 7th HI 180 degree roll on Behind will take place on Wednesday, Aug 5, starting at 15:50 UT. * 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. There will be a 3 hour track very early in the morning, starting at 5:45 UT, for powering down HV on IMPACT and PLASTIC. This will be closely followed by the main 8 hour track on station 14 starting at 9:40 UT. As with the previous reset on Behind, it is planned to power down the instruments with time-tagged commands, 5 minutes apart. IMPACT and PLASTIC will power off at 09:40, followed by SECCHI at 09:45, and SWAVES at 09:50 UT. The system reset is expected to occur at 10:20 UT, followed by the recovery activities. The round-trip light travel time will be around 15m40s, which is about 2 minutes longer than during the Behind reset. This will make the recovery time longer, which is accommodated by a longer track. It is expected that the instruments will start powering up around 15:00 UT. * There is another 8 hour track on the next day. If not needed for backup, this track will be used to continue instrument recovery. There is also a five hour track later in the day, which will be used for IMPACT/SEPT recovery. IMPACT/SIT recovery will proceed on Thursday, continuing on Friday if needed. * PLASTIC and SWAVES will be performing their recoveries from their home institutions. IMPACT will be performing part of their recovery from Berkeley, and part from APL. * 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. * Because of the reset and recovery operations, it was decided to move the regular weekly telecon to Monday, Aug 3, at the usual time of 12:30. * A timeline for the recovery operations should be sent out to the instrument teams by the end of the week. Week 33 * The track duration for both spacecraft will increase to 6 hours in preparation for switching to 360 kbps. The actual switch will occur for Ahead on day 229 (Aug 17), and for Behind on day 251 (Sep 8). This will maintain an RF margin of 2 dB. * The 8th SECCHI HI 180 degree roll will occur on Ahead on day 225 (Aug 13) starting at 01:50 UT. Other * IMPACT and PLASTIC currently plan not to install monitoring software on their POC workstations, and will instead forgo internet access. There are concerns about the effect this software would have on operations. * Station 15 is expected to be back online on day 202 (Jul 21). * The MOC is almost back to normal operations after their internet outage. COORDINATED OBSERVATIONS ------------------------ 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, 21:50 F Jul 31 (212) S Aug 01 (213) S Aug 02 (214) ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 03 (215) T Aug 04 (216) Ahead: Spacecraft reset for G&C update W Aug 05 (217) Ahead: Spacecraft recovery continues Behind: SECCHI HI 180 degree roll, 15:50 T Aug 06 (218) F Aug 07 (219) S Aug 08 (220) S Aug 09 (221) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 10 (222) Both: Begin 6 hour daily DSN tracks T Aug 11 (223) W Aug 12 (224) T Aug 13 (225) Ahead: SECCHI HI 180 degree roll, 01:50 UT F Aug 14 (226) S Aug 15 (227) S Aug 16 (228) ------------------------------------------------------------------------------- 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 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