******************************************************************** UARS WEEKLY STATUS REPORT - 07 Nov 1997 ******************************************************************** *********** 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 scan data during this past week without apparent problems. A lamp calibration scan was also successfully performed. *********** PEM *********** PEM zenith spectrometers were active from October 31 through November 2. During this time, PEM produced energy deposition profiles of the electron and proton precipitation. 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 *********** HALOE remains in survival mode. HALOE is scheduled to be powered on beginning-of-day on November 11, 1997. *********** MLS *********** MLS was reactivated as scheduled on Oct 31 @18:50, in the reduced 85 watt power mode. MLS was then powered off at 23:43 due to low EON voltage. MLS was reactivated in the 85 watt power mode again on Nov 2 @02:52. MLS was again powered off due to low EON voltage on Nov 2 @09:54. MLS was reactivated in the 85 watt power mode on Nov 2 @12:20 and made full vertical scans until MLS was powered off on Nov 4 at 20:58 UT. MLS is scheduled to start north viewing operations on Nov 20. *********** HRDI *********** Nothing received. *********** 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 November 7, 1997 --------------------------------------------- The software that generates the UARS level 0 files will be re-hosted to a more current hardware platform on Saturday November 15, 1997. UARS CDHF users should notice no change in the level 0 product. However, if users notice anything unusual in the level 0 product or associated RAC transfer activities please contact the PAC office immediately. A NEWS message will be released on the CDHF with more detail about this activity. The CDHF has received a total of 340 CD-ROM requests as of 07 November-1997. One new CD-ROM order was received and shipped this week. The CDHF successfully tested MLS V4.9 Engineering Software. Additional days in Engineering Mode will be processed before MLS makes a final delivery and production mode begins. 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. 30 days PEM (3.32) Prod (1350R-540C=810L) 27 days MLS (4.9) ENG (40R-27C=13L) Pending CDHF software upgrades include IDL 5.0, and OpenIngres 2.0 *********** FOT *********** REPORTING PERIOD This report covers 24 October 1997 (Orbit 33443, GMT Day 298) through 31 October 1997 (Orbit 33548, GMT Day 304). SPACECRAFT OPERATION The 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 298/2311 33458 Off HRDI 99/0048 33459 On ACRIM 300/0052 33474 On SUSIM 300/1329 33482 On HALOE 303/2326 33533 Off HRDI 303/2326 33533 Standby PEM 304/0147 33534 ZEPS On MLS 304/1849 33545 On MLS 304/2340 33548 Off The beta angle is now decreasing toward a minimum angle of 0 degrees on 07 November 1997 (DOY 311). 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 23.5 end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 1.3 degrees C. Additional battery performance data for each battery on 25 October 1997 and 31 October 1997 are provided in Appendix D. The clock error ranged from -10.7 to +10.8 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 = 16 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % FOT 04 % ACRIM 01 % HALOE 01 % HRDI 05 % MLS 03 % PEM 01 % SOLSTICE 01 % SUSIM 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 04 TRANSPONDER FREQUENCIES: Transponder A: 97/287 - 2287.496931 Transponder B: 97/295 - 2287.499126 GROUND SYSTEM OPERATION Four (4) 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 97/303 show the observatory data loss to be 20 hours, 41 minutes, 03.985 seconds (an increase of 0.004 seconds). This is a 0.0386 percent data loss which equals a 99.9614 percent data capture for the mission. The increase of 0.004 seconds occurred on Day 298 and was the result of hits in the data. The FOT observed that the SSPP was apparently not correctly tracking star number 48000001 during several real-time events on 29 October 1997. The SSPP beta angle in the real-time telemetry was approximately 13 degrees offset from the predicted value in the CMS generated tracking reports. Investigation revealed an erroneous right ascension precession rate in the latest FDF supplied star catalog. This error resulted in the CMS software generating incorrect star position coordinates in the weekly OBC System Table 65 load. Therefore, when the SSPP was commanded (via stored commands) to track star 48000001, it was pointing at an incorrect right ascension as defined by System Table 65. FDF was notified and is currently working on generation of a new star catalog with a correct precession rate for star 48000001. SOLSTICE operations has been asked not to request SSPP to track the star in question. The functionality of all remaining operational functions on UMPG Alpha computer (node UMPGAL) was verified. Several DCL command file changes were required to support printing of FOT plot files from UMPGAL. UMPGAL will replace UMPG as the operational MPG node (for FOT purposes only) late next week. The MPG plans on switching Daily Activity Plan (DAP) processing to UMPGAL before the end of the November 1997. No testing of the new CMS software release (R7B1V2) occurred this week. The FOT and UCMS system managers are currently trying to find a spare workstation which can be hooked up to the UCMSB (back-up) system. This workstation is necessary for the FOT to test the next CMS software release (R7B1V2), which currently resides on UCMSB in a test environment. FOT continues to assess participation in the IP return-link telemetry test that the network is conducting through the end of November 1997. Since the FOT is currently in the process of transition back to the remodeled control center, UARSU involvement in the testing will most likely be delayed until after 10 November 1997. Several POCC database modifications were made and a preliminary version of UARS Database Version 64 was delivered to the MSOCC software coordinator this week. The modifications were necessary to provide more accurate monitoring of the UARS yaw-around maneuvers. The new database will be placed on the UTTS AP disk pack and tested by the FOT beginning 03 November 1997. Assuming no problems are found, the database will be officially released next week and used for the upcoming yaw-around maneuver on 07 November 1997. 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 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. The FOT delivered an ASCII format version of the OBCSTF resident POCC database to the TOMS/UARS re-engineering team this week. 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 07 November 1997 at 311/132708. The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust will probably be required in mid-1998. FACILITIES CRTs, computers, and other equipment are being installed in the semi- circular console within the UARS/TOMS Mission Operations Room (MOR). Operations continue from a dedicated room in the EOS area which is across the hall. 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 31 October 1997 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 33452 298/1258 97-529 HRDI Increase HTR delay - 600 Amp Min 33458 298/2311 97-530 MLS Power OFF 33459 299/0048 97-531 HRDI Power ON 33459 299/0048 97-532 HRDI Set Htr Delay Cycle - 400 amp min 33474 300/0052 97-533 ACRIM Power ON 33474 300/0052 97-534 SOLSTICE Microloads 33482 300/1329 97-535 SUSIM Power ON 33483 300/1516 97-536 OBC Clk Adj fr 20.6 to 0.00 msec/day 33486 300/2015 97-537 PSU Reset CH18 HTR cycle to Normal Configuration 33512 302/1345 97-538 OBC/CLK Clk Adj fr 0.00 to 20.6 msec/day 33533 303/2326 97-539 HALOE Power OFF 33533 303/2326 97-540 HRDI HRDI to Standby 33534 304/0147 97-541 PEM "Power ON, ZEPS" 33542 304/1350 97-542 OBC/CLK Clk Adj fr 20.6 to 0.00 msec/day 33545 304/1849 97-543 MLS Power ON 33547 304/2154 97-544 HRDI HRDI to Standby again 33548 304/2340 97-545 MLS Power OFF _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 31 October 1997 The following Out-of-Limit (ALARM) conditions were detected: MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ OBSVLBEON Y-LO Load Bus Volts at EON 33444-52,85,8,9,518 R-LO 33451,4,5,7,519-48 OBSBATVEON2 Y-LO Battery 2 voltage at EON 33444-52,5,89-518 R-LO 33451,4,7,519-48 OBSBATVEON3 Y-LO Battery 3 voltage at EON 33444-52,5,89-518 R-LO 33451,4,5,7,519-48 OBSSOC2 Y-LO Battery 2 Current SOC 33451,66,81,95-7,542,7,8 QTSISAIF Y-HI SSPP Baseplate by SISA I/F 33444-49,51-84 QTSSPPPX Y-HI SSPP +X Thermostat 33451,66 QTSSPPMX Y-HI SSPP -X Thermostat 33480 HRIFESURVTMP Y-HI HRDI IFE Survival Temp 33535 HRRADTEMP Y-HI HRDI radiator temp 33535 The following Out-of-Limit (ALARM) conditions were detected: MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ ACTEMPANA1 Y-LO Temp PCU Board 33474-81,83-85,87-90 ACTEMPANA2 Y-LO Temp Sensor Electronics 33474-81,83-86 ACTEMPHM Y-LO Temp Heatsink Mass 33474-81 ACTEMPSA1 Y-LO Temp ACR 1 33474-77 ACTEMPSA2 Y-LO Temp ACR 2 33474-76 ACTEMPSA3 Y-LO Temp ACR 3 33474-77 ACTEMPSS Y-LO Temp Sun Sensor 33474-81 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ None this report period APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 31 October 1997 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 33484 300/15:29 (27 Oct 97) from 20.6 to 00.0 msec/day 33512 302/13:50 (29 Oct 97) from 00.0 to 20.6 msec/day 33542 304/13:54 (31 Oct 97) from 20.6 to 00.0 msec/day _______________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 31 October 1997 25 Oct. 1997 - GMT Day 298 Beta = 42.6 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 -2.42/-3.68 +0.0/ +0.0 18.7 0.000 0.0 2 +89.6/ +0.0 +7.09/+5.79 +29.6/-16.8 24.5 1.020 23.5 3 +67.2/ -11.2 +5.47/+4.51 +28.8/-16.4 24.5 1.023 22.8 31 Oct. 1997 - GMT Day 304 Beta = 26.3 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 -2.42/-3.05 +0.0/ +0.0 18.7 0.000 0.0 2 +78.4/ +0.0 +8.07/+7.09 +32.8/-16.4 23.7 1.017 23.9 3 +67.2/ -5.6 +7.09/+5.47 +31.6/-16.4 23.5 1.019 23.0 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes _______________________________________________________________ APPENDIX E UARS ANOMALY REPORTS Week ending 31 October 1997 AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 97-111 FOT 33460 299/0228 14170 Generic Late Acquisition 97-111 FOT 33472 299/2152 14170 Generic Late Acquisition 97-118 FOT 33518 302/2322 19566 No acq. for entire event 97-111 FOT 33516 302/2024 14171 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 97-112 FOT 33110 275/1654 AP DOWN 97-113 FOT 33139 277/1508 YAW SKEW WHEEL DIR 97-114 FOT 33210 282/0944 19451 NO ODM OR GCMRUS 97-115 FOT 33262 285/2028 AP CRASHED 97-116 FPT 33263 285/2239 TAC CRASHED 97-117 FOT 33360 292/0935 19551 TDRS SSA FAILURE ANOMALY INVESTIGATION REPORTS GENERATED AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------- ------ ----- ---- --- ----------------- None this report period