******************************************************************** UARS WEEKLY STATUS REPORT - 12 MAR 1999 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. *********** SUSIM *********** SUSIM successfully gathered its normal solar, offset, and occultation data without apparent problems. Reprocessing of the SUSIM data to data version 20 continues. On March 12, 1999, SUSIM begins a major calibration using all four deuterium calibration lamps. Afterward, SUSIM will begin a fundamentally new operational scenario in which elements of the optical path used for daily observations are replaced in favor of ones which are more responsive. It is expected that this change will increase the quality of the received signals while maintaining SUSIM's long-term calibration. *********** PEM *********** Nothing received. *********** HALOE *********** Nothing received. *********** MLS *********** The instrument is now off as scheduled. MLS is scheduled to begin north viewing operations on Apr 4 and operate though Apr 10. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing recived. *********** 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 *********** 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. 49 days PEM (3.32) PROD (OA-L2) (760R-229C=531L) 145 days SUS (7.0) PROD (668R-401C=267L) 11 days WIN (5.11) PROD TEST (LOG) (11R-11C=0L) 11 days WIN (5.11) PROD TEST (L1-L3) (11R-11C=0L) Preventive Maintenance for the CDHF systems and peripherals is due in March. It is scheduled for Tuesday 03/16/99. The CDHF is scheduled to participate in an End to End Y2K test on April 5th. This test will require a system clock time shift and an interruption to normal operations. CDHF pending software upgrades: DEC AXP Fortran 6.5, DEC AXP OPEN VMS 6.2, OpenIngres SOLSTICE Wall Clock time increase/no change in status. *********** FOT *********** REPORTING PERIOD This report covers 27 February 1999 (Orbit 40781, GMT Day 058 through 05 March. Observatory is now in Forward Flight (Southern Hemisphere viewing) and is performing nominally under two-battery operations. The instrument operational changes were: INSTRUMENT OPERATIONAL CHANGES Instrument Time Orbit Comment MLS 058/0037 40781 On SOLSTICE 058/0052 40781 Day Only MLS 063/2320 40870 Off ACRIM 064/0100 40870 On SOLSTICE 064/0112 40870 Full Time WINDII 064/0432 40873 On SUSIM 064/1205 40878 On The beta angle ranged between the angles of 22.9 degrees to 46.2 degrees for this report period. The beta angle is now increasing toward a maximum angle of +53 degrees on 10 March 1999 (DOY 069). A +0.5 Degree Roll Offset Maneuver was performed on 04 March (DOY 063) in Orbit 40870 at 063/22:48:00. The maneuver was requested by the WINDII instrument to facilitate the observation of Polar Mesospheric Clouds. UARS will return to level flight at the end of day on 16 March (DOY 075). The exact time for the return maneuver has not yet been finalized. 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 V end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 1.0 to 1.3 degrees C. Additional battery performance data for each battery on 26 February 1999 and 05 March 1999 are provided in Appendix D. The clock error ranged from 10.7 to -12.6 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 = 02 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % FOT 03 % MLS 05 % WINDII 01 % ACRIM 01 % HALOE 01 % SUSIM 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 06 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: Transponder A: 99/054 - 2287.496948 Transponder B: 99/055 - 2287.498731 GROUND SYSTEM OPERATION Six (6) operational support problems 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 99/063 show the observatory data loss to be 22 hours, 46 minutes, 32.756 seconds (an increase of 05.152 seconds since last report period). This is a 0.0351 percent data loss which equals a 99.9649 percent data capture for the mission. The increase of 05.152 seconds occurred over five (5) days: 7 1.120 seconds on Day 058 due to no overlap, data hit. 7 0.224 seconds on Day 059 due to data hit. 7 1.152 seconds on Day 061 due to no overlap. 7 0.672 seconds on Day 062 due to data hit. 7 1.984 seconds on Day 063 due to data hit (IP). No additional Y2K "test" 8-week planning aids were received by the FOT this week. The FOT is still awaiting the delivery of two "corrected" planning aids to complete the test set. These two remaining files will most likely be delivered to the FOT next week, after which time the FOT will process the files and make them available to the MPG and Instrument Operations Teams. The UARS Test and Training Simulator (UTTS) remains non-operational. The estimated time to repair the UTTS and return it to operation is unknown. OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS The FOT continues to support the PEM team with diagnosis of the Energy Processor 6 status error. PEM EP6 is still not coming up nominally under PMON control. The FOT will conduct additional tests to identify where in the turn-on sequence the conflict occurs in the coming week. The FOT continues to investigate the feasibility of a new PMON action to change battery V/T curves based on loading to mitigate battery risks in sun pointing safehold. YEAR 2000 OPERABILITY SUPPORT - No change UARS PROPULSION MODULE B/D THRUSTER LINE FILL Planning continues for the simulator testing. UARS RE-ENGINEERING - TELEMETRY PROCESSING - No change MEETINGS FOT participated in a meeting on 03 March 1999 concerning the development of an Operational Concept Document for the proposed Integrated Mission Operation Complex (IMOC). FOT attended a Y2K Contingencies Meeting hosted by John Valiant on 03 March 1999. The FOT turned in a questionnaire about possible UARS Y2K scenarios and received a list of the priority order for spacecraft should a crisis arise. FUTURE SIGNIFICANT EVENTS The next UARS Yaw Around Maneuver (forward-to-reverse) is scheduled for 28 March 1999 (DOY 087). 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 05 March 1999 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 40781 058/0037 99-080 MLS Power ON 40796 059/0037 99-081 OBC Clk Adj fr 0.00 to 20.6 msec/day 40797 059/0223 99-082 MLS MLS Stop/Run 40823 060/1952 99-083 OBC Clk Adj fr 20.6 to 0.00 msec/day 40823 060/1952 99-084 MLS Scan actuator off due to HI temps. 40825 060/2132 99-083 MLS Restart Scan sequence 40858 063/0428 99-086 OBC Clk Adj fr 0.00 to 20.6 msec/day 40870 063/2320 99-087 MLS Power OFF 40870 063/2320 99-088 HALOE Update Sunrise parameter 40871 064/0100 99-089 ACRIM Power ON 40873 064/0432 99-090 WINDII Power ON 40878 064/1205 99-091 SUSIM Power ON _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 05 March 1999 MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ NBRECBI Y-HI NBTR B Current 40786 QTSSPPPX Y-HI SSPP at +x therm 40833,61,73 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ None this report period _______________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 05 March 1999 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 40796 059/00:43 (27 Feb 99) from 00.0 to 20.6 msec/day 40823 060/19:56 (01 Mar 99) from 20.6 to 00.0 msec/day 40858 063/04:33 (03 Mar 99) from 00.0 to 20.6 msec/day _______________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 05 March 1999 26 Feb 1999 - GMT Day 057 Beta = 22.9 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 -5.6/-33.6 -3.05/-4.31 +0.0/ +0.0 16.8 0.000 0.0 2 +61.6/ 0.0 +5.47/+4.51 +31.6/-14.0 25.4 1.024 21.2 3 +67.2/-16.8 +4.51/+3.23 +31.2/-15.2 25.4 1.024 21.0 05 Mar 1999 - GMT Day 064 Beta = 46.2 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 -11.2/-33.6 -3.05/-4.62 +0.0/ +0.0 16.8 0.000 0.0 2 +22.4/-16.8 +5.15/+3.87 +28.0/-15.2 26.2 1.025 26.0 3 +39.2/-11.2 +3.87/+2.92 +27.2/-16.0 26.1 1.021 25.7 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes V/T 5 APPENDIX E UARS ANOMALY REPORTS Week ending 05 March 1999 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-006 FOT 40802 059/1012 14170 Generic Late Acquisition 99-006 FOT 40825 060/2132 14170 Generic Late Acquisition 99-006 FOT 40836 061/1655 14170 Generic Late Acquisition 99-006 FOT 40851 062/1701 14170 Generic Late Acquisition 99-006 FOT 40855 062/2317 14170 Generic Late Acquisition 99-006 FOT 40865 063/1644 14170 Generic Late Acquisition 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 OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-006 FOT see list Mar 99 14170 Generic Late Acq SEVNTFW99/10