STEREO Weekly Meeting Minutes for 2008-04-01 (Week 14) ANNOUNCEMENTS ------------- The following announcement was added to the minutes after the meeting was ended: * The Goddard Center Network Environment (CNE) will be upgraded on April 5, and will be down for the majority of the day. This will affect the STEREO website stereo.gsfc.nasa.gov, but the SSC website at stereo-ssc.nascom.nasa.gov is expected to be available during this period. 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 13 * The Ahead track for day 87 (Mar 27) on station 43 was switch to 45 for another mission. * On day 85, during the Ahead pass on station 25, ranging lock was lost for 7 minutes starting at 16:20 because of a problem at the station. Ranging data was lost during those 7 minutes. * The 12th momentum dump on Ahead was successfully carried out on day 85 (Mar 25), at 16:30 UT. * Station 45 tracks for Behind on days 85 and 86 (Mar 25,26) were switched to station 24 because of the unavailability of station 43. Station 43 is now available again. * Ranging lock was lost for 35 minutes during the Behind pass on day 87 (Mar 27), resulting in a loss of ranging data during that time. Command bind was also lost, but no telemetry was lost. * The average daily downlink was 7.1 gigabits on Ahead, and 7.5 gigabits on Behind. Week 14 * The SECCHI stepped calibration on Ahead was successfully carried out today (day 92, April 1) at 10:35 UT. * SWAVES performed a flight software load on the Ahead spacecraft this morning, April 1. (The same flight software load was performed on Behind on April 2.) * High gain antenna calibrations will be carried out on both spacecraft on April 2, at 15:00 for Ahead, and 20:00 for Behind. The operation will take 1.5-2 hours. Tracks have been extended for this activity. APL requests an estimate of returned power. * There will be a fault protection load on Thursday, day 94 (Apr 3), adjusting the timing of an autonomy rule to bring down more telemetry in case of a star tracker failure. * The NOAA antenna station at Chilbolton, England reported losing beacon telemetry from Toulouse, France at 08:58 UT this morning. However, subsequent analysis shows that beacon telemetry continued to flow in from the station in Toulouse, France until the SECCHI roll maneuver. Week 15 * Switch maintenance will be performed at JPL on day 99 (Apr 8), starting at 16:00 UT and lasting for 10 minutes. Realtime telemetry will be lost during this time. Week 16 * No unusual activities. Week 17 * No unusual activities. Other * The Whole Heliospheric Interval started Thursday, March 20, and runs through April 16th. Only STEREO synoptic data is requested. So far, the campaign is running well, with the exception that Hinode participation is constrained by their current telemetry rates. * The SECCHI team is interested in getting estimates of the telemetry volumes expected during the nominal mission. Some of this information is available in the Senior Review proposal, and some in the Science Operations Plan. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Mar 31 (091) JOP 202, Origin of the Slow Solar Wind JOP 194, Activity in Filaments and Filament Cavities T Apr 01 (092) Ahead: SECCHI stepped calibration roll 10:35 UT JOP 202, Origin of the Slow Solar Wind JOP 194, Activity in Filaments and Filament Cavities W Apr 02 (093) Both: HGA calibrations, Ahead: 15:00, Behind 20:00 UT JOP 202, Origin of the Slow Solar Wind JOP 194, Activity in Filaments and Filament Cavities T Apr 03 (094) JOP 203, Coronal hole boundaries F Apr 04 (095) JOP 203, Coronal hole boundaries S Apr 05 (096) JOP 203, Coronal hole boundaries S Apr 06 (097) JOP 203, Coronal hole boundaries Notes: * Whole Heliosphere Interval, Mar 20 - Apr 16 ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 07 (098) JOP 203, Coronal hole boundaries T Apr 08 (099) JOP 203, Coronal hole boundaries W Apr 09 (100) JOP 203, Coronal hole boundaries T Apr 10 (101) JOP 204, Energetics and dynamics of quiet Sun F Apr 11 (102) JOP 204, Energetics and dynamics of quiet Sun S Apr 12 (103) JOP 204, Energetics and dynamics of quiet Sun S Apr 13 (104) JOP 204, Energetics and dynamics of quiet Sun Notes: * Whole Heliosphere Interval, Mar 20 - Apr 16 ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 14 (105) JOP 204, Energetics and dynamics of quiet Sun T Apr 15 (106) JOP 204, Energetics and dynamics of quiet Sun W Apr 16 (107) JOP 204, Energetics and dynamics of quiet Sun End of Whole Heliospheric Interval T Apr 17 (108) F Apr 18 (109) S Apr 19 (110) S Apr 20 (111) Notes: * Whole Heliosphere Interval, Mar 20 - Apr 16 ------------------------------------------------------------------------------- Scheduled activities for Week 17: M Apr 21 (112) T Apr 22 (113) W Apr 23 (114) T Apr 24 (115) F Apr 25 (116) S Apr 26 (117) S Apr 27 (118) ------------------------------------------------------------------------------- Upcoming events: 2008: SECCHI Stepped calibration rolls Ahead: Jun 24, Sep 23, Dec 16 Behind: May 20, Aug 26, Dec 2 * Dec 2007-May 2008 Ulysses quadrature http://stereo-ssc.nascom.nasa.gov/plans/UlyLocation2006-2014_v1.pdf * Mar 20 - Apr 16 Whole Heliosphere Interval http://ihy2007.org/WHI/targeted_plans.shtml Mar 20-26 JOP 201, Linking Corona to Solar Wind at Ulysses Mar 27-Apr 2 JOP 202, Origin of the Slow Solar Wind Apr 3-9 JOP 203, Coronal hole boundaries *or* JOP 206, Low-latitude coronal holes Apr 10-16 JOP 204, Energetics and dynamics of quiet Sun Targets of opportunity: JOPs 205, 206, 194 * May - July SUMER/Hinode campaign (TBD) * Oct 6 Messenger - Mercury fly-by * Nov 1-Dec 15 SUMER campaign