******************************************************************** UARS WEEKLY STATUS REPORT - 21 November 1997 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. This week also performed a special solar pointing experiment to help us characterize the SSPP's stellar pointing performance. This was similar to the exeriment we did last July (see weekly report 08/01/97). Reults showed a pointing error near 30 arc-seconds and good agreement with a nominal solar track. This give us confidence in the ability of the SSPP to accurately track a stellar target. *********** SUSIM *********** SUSIM successfully gathered its normal solar, offset, and occultation scan data during this past week without apparent problems. *********** PEM *********** PEM AXIS were active from November 9 through November 11. During this time, PEM produced energy deposition profiles due to electrons inverted from X-ray data. PEM is awaiting evaluation by GSFC of its proposed activation procedure. The minimal configuration for PEM AUX activation is the zenith VMAG, MEPS1, MEPS2, and HEPS1 units, only. This configuration is driven by the capabilities of the spacecraft OBC and may increase if OBC program area increases. PEM activation is proposed to be OBC driven when there exists plenty of power to operate PEM. It is anticipated that the OBC will activate PEM on the daylight portions of every orbit. *********** HALOE *********** Nothing received. *********** MLS *********** Nothing received. *********** HRDI *********** HRDI was turned off as scheduled on the 19th of November, 1997. Our next = scheduled on-time will be December 8. Since next week a holiday, we wish = everyone involved a Happy Thanksgiving. *********** WINDII *********** Nothing received. *********** MPG *********** Routine processing of instrument Daily Activity Plans continues with no problems. The MPG continues to assist the Project Scientist with the scheduling of instrument operations. *********** CDHF *********** UARS CDHF Status Week Ending Nov 21, 1997 ----------------------------------------- UARS Level 0, NRT and Quicklook file generation software was successfully re-hosted to the new hardware platform on November 15. The CDHF has received a total of 346 CD-ROM requests as of 21 November 97. Five new CD-ROM orders were received and shipped this week. The CDHF processed current day data through level 3 for all active instruments. Additionally, CDHF personnel reprocessed: (R)= Requested (C) = Complete, (F)= Failed (L) = Days remaining to reprocess. 25 days PEM (3.32) Prod (1350R-590C=760L) The CDHF reingested level 0 for UARS day 2166 due to better data quality. The CDHF started receiving UKMO data on 14-November-1997. UKMO is now catching up with missing days. Pending CDHF software upgrades include IDL 5.0 and OpenIngres 2.0. *********** FOT *********** REPORTING PERIOD This report covers 07 November 1997 (Orbit 33653, GMT Day 311) through 14 November 1997 (Orbit 33757, GMT Day 318). SPACECRAFT OPERATION The observatory is now in Reverse Flight (Northern Hemisphere viewing) and is performing nominally under two-battery operations. The instrument operational changes were: INSTRUMENT OPERATIONAL CHANGES Instrument Time Orbit Comment PEM 313/0013 33668 AXIS On HALOE 315/0022 33698 On HALOE 315/0202 33700 Low power HALOE 315/1601 33708 On PEM 315/1815 33710 AXIS Off HRDI 316/0029 33714 On HRDI 316/0206 33715 Off HRDI 317/0029 33729 On HRDI 317/0212 33730 Off HRDI 317/0623 33732 On The beta angle is now increasing toward a maximum angle of 78.1 degrees on 27 November 1997 (DOY 331). Spacecraft battery 1, 2, and 3 performance monitoring continues. Battery 1 remains OFF the charge relay. Battery 2 and Battery 3 are currently maintaining greater than 23.8 end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 1.4 degrees C. Additional battery performance data for each battery on 08 November 1997 and 14 November 1997 are provided in Appendix D. The clock error ranged from -11.2 to +9.8 msec during this report period. Clock rate adjustments are listed in Appendix C. All instrument and subsystem engineers were advised on the initial excursion of ALERTS or Out-Of-Limits conditions detected by the FOT for this report. A summary is listed below and the details of ALERT and Out-Of-Limits occurrences are listed in Appendix B. % ALERTS = 00 % OUT-OF-LIMITS = 19 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % FOT 02 % HRDI 06 % HALOE 03 % SUSIM 01 % SOLSTICE 01 % PEM 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 03 TRANSPONDER FREQUENCIES: Transponder A: 97/301 - 2287.497086 Transponder B: 97/302 - 2287.499098 GROUND SYSTEM OPERATION Two (2) operational support problem(s) occurred this period. Anomaly Reports are included in Appendix E. The data loss calculations supplied by Data Capture Facility (DCF) from mission start through UTC Day 97/317 show the observatory data loss* to be 20 hours, 41 minutes, 00.148 seconds (an increase of 4.192 seconds). This is a 0.0384 percent data loss which equals a 99.9616 percent data capture for the mission. The increase of 4.192 seconds occurred on Day 317 and was due to a hit in the data. *NOTE The total data loss listed above includes a correction for a loss on Day 228 that was recovered. Part of the data loss on Day 228 was attributed to hits in the data but was really due to an in-house line problem. The Level-0 has been recreated to include the missing data and forwarded to CDHF. UARS POCC database version 064 was officially released on 07 November 1997. The database incorporated minor modifications to some of the partial system tables (p-tables) and discrete state definitions. The database was tested by the FOT before being released to operations. Flight Dynamics Facility (FDF) continues the generation process for a new Star Catalog to fix the invalid precession rate for star 48000001. All previous star catalogs were generated by FDF on the IBM system. This will be the first catalog created using the HP workstation, and the procedure to generate the Star Catalog is still being ironed out. The FOT is still working out the details of participating in the IP return-link telemetry test that the network is conducting through the end of November 1997. There is still some concern regarding the integrity of the IP conversion devices that UARS will be utilizing. The FOT received a request to perform a special solar tracking experiment from SOLSTICE operations this week. The experiment (which was performed earlier this year) will involve commanding the SSPP to point to a particular Right Ascension and Declination, instead of using the Solar ephemeris to track the Sun. All of the pointing times and angles will be calculated by SOLSTICE operations and confirmed by the FOT. No testing of the new CMS software release (R7B1V2) occurred this week. Investigation of the stored command verification problem - time to complete - associated with Applications Processor (AP) software release 10.08 continued. The cause has been identified, but rectifying the problem continues. OTHER SIGNIFICANT EVENTS HALOE FOT submitted a contingency plan to save power and avoid a full shut down during reduced power situations. The HALOE FOT maintains that this contingency plan removes 25 Watts from the bus. The contingency plan works by turning off the HALOE heater/motor bus and leaving their Quiet Bus (QB) and Pulse Bus (PB) on. The FOT utilized this mode on Day 315 during the pass after HALOE was completely powered up to full power thereby avoided shut down. The following morning HALOE was fully powered up. Monitoring of the magnetic field model performance continues. FOT continues to develop an updated Power Profile for UARS due to the current status of the Modular Power System. FOT continues to support the new UARS ground system re-engineering effort. MEETINGS No UARS Battery telecon was held this week. The next telecon has not been scheduled. FUTURE SIGNIFICANT EVENTS The next UARS Yaw Around Maneuver is currently scheduled for 17 December 1997 at 311/132708. The Replacement Level Zero Processor (LZPR) will be elevated to operational status on 15 November 1997. The replacement procedure will result in a planned 10-hour downtime during which no Level Zero Data will be processed - no Near Realtime Data (NRT) or FOT plots. The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust will probably be required in mid-1998. FACILITIES UARS Off-line Engineering moved from Room E137 on the first floor of Building 32 to Room W235 on the second floor adjacent to the newly refurbished UARS/TOMS control center on 10 November 1997. Telephone numbers are unchanged. The UARS and TOMS control centers were relocated to the newly refurbished unified control center on 11 November 1997. The new control center with new consoles is located in the original location for UARS in Room C221 of Building 32. PERSONNEL CHANGES None Attachments: Appendix A, Real-time Commands Sheets Appendix B, Out-Of-Limits & ALERT Occurrences Appendix C, Clock & Solar Array Rate Corrections Appendix D, UARS Battery Performance Data Appendix E, UARS Anomaly Reports APPENDIX A REAL-TIME COMMAND SHEETS Week ending 14 November 1997 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 33668 313/0013 97-555 PEM Power ON Axis 33682 313/2237 97-556 SUSIM Commands 33698 315/0022 97-557 HALOE Power ON 33700 315/0202 97-558 HALOE HALOE To Low Power Mode 33708 315/1601 97-559 HALOE Returned to Normal Ops 33710 315/1815 97-560 PEM Power OFF AXIS 33714 316/0029 97-561 HRDI Power ON 33715 316/0206 97-562 HRDI Power OFF 33719 316/0950 97-563 OBC Clk Adj fr 0.00 to 20.6 msec/day 33729 317/0029 97-564 HRDI Power ON 33730 317/0212 97-565 HRDI Power OFF 33732 317/0623 97-566 HRDI Reduce HTR delay to 400 amp-min 33732 317/0623 97-567 HRDI Power ON 33743 317/2253 97-568 OBC Clk Adj fr 20.6 to 0.00 msec/day 33758 318/2337 97-568 SOLSTICE Reboot Soltice _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 14 November 1997 The following Out-of-Limit (ALARM) conditions were detected: MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ CDUNREG28 Y-LO CDH +28V UNREG BUG 33702 HAH28VA R-LO +28 HTR/MTR PS VOLT 33700-8 HRPSEPBIMON R-LO HRDI PULSE BUS CURRENT MONITOR 33730 HRPTSPBIMON Y-HI HRDI TELESCOPE PB CURRENT MON. 33734 NBRECBI Y-HI NBTR B Current 33657,8,716 OBSSOC2 Y-LO Battery 2 Current SOC Continuous OBSVLBEON R-LO Load Bus Volts at EON Continuous OBSBATVEON2 R-LO Battery 2 voltage at EON Continuous OBSBATVEON3 R-LO Battery 3 voltage at EON Continuous QTSISAIF Y-HI SSPP Baseplate by SISA I/F 33656- 60,4,73,88,717 APPENDIX B (cont) OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 14 November 1997 MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ PWLBV Y-LO Current Load Bus Volts 33687,702,17,52 PWBAT2V Y-LO Battery 2 Current Voltage 33702,52 PWBAT3V Y-LO Battery 3 Current Voltage 33687,702,17,52 PWLBV R-LO Current Load Bus Voltage 33657,8,72 PWBAT2V R-LO Current Batt 2 Voltage 33657,8,72 PWBAT3V R-LO Current Batt 3 Voltage 33657,8,72 SOSGTEVLTG R-LO SOLSTICE G_Tube Voltage 33756 SORGTERVE R-LO SOLSTICE G_Tube R_Voltage 33756 WIEUTEMP Y-LO WINDII EU Temperature 33654-113 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS -------- ----------- ------ None this report period APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 14 November 1997 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 33719 316/09:56 (12 Nov 97) from 00.0 to 20.6 msec/day 33742 317/22:56 (13 Nov 97) from 20.6 to 00.0 msec/day _______________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 14 November 1997 08 Nov 1997 - GMT Day 312 Beta = 4.9 deg, SA Pos = 269 deg DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%) --- ------------ ---------- ----------- ------- ------- ------ 1 +728.0/+728.0 -3.03/-3.89 +0.0/ +0.0 18.7 0.000 0.0 2 +33.6/ -5.6 +7.17/+5.85 +30.8/-15.6 23.8 1.020 24.2 3 +44.8/ -11.2 +5.79/+4.51 +29.8/-15.2 23.8 1.024 23.2 14 Nov 1997 - GMT Day 318 Beta = 30.6 deg, SA Pos = 269 deg DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%) --- ------------ ---------- ----------- ------- ------- ------ 1 +728.0/+728.0 -2.94/-3.68 +0.0/ +0.0 18.7 0.000 0.0 2 +22.4/ -33.6 +7.74/+6.44 +31.0/-16.4 24.2 1.019 24.8 3 +33.6/ -22.4 +6.44/+5.15 +29.7/-16.1 24.0 1.021 23.6 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes _______________________________________________________________ APPENDIX E UARS ANOMALY REPORTS Week ending 14 November 1997 AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 97-119 FOT 33698 315/0022 14170 Generic Late Acquisition 97-119 FOT 33708 315/1601 14170 Generic Late Acquisition 97-121 SOLSTICE 33757 318/2137 N/A Solstice Crash ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- None this report period ANOMALY INVESTIGATION REPORTS GENERATED AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------- ------ ----- ---- --- ----------------- None this report period