******************************************************************** UARS WEEKLY STATUS REPORT - 29 MAY 1998 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. *********** SUSIM *********** SUSIM has successfully gathered its normal solar, offset, and occultation scan data without apparent problems. *********** PEM *********** Nothing received. *********** HALOE *********** Nothing received. *********** MLS *********** MLS was reactivated successfully on May 20, in the reduced 85 watt power mode. MLS instrument operations have continued flawlessly. MLS is scheduled to operate through June 1. *********** HRDI *********** HRDI is currently off. Next scheduled turn-on is May 31st. *********** WINDII *********** WINDII WEEKLY REPORT FOR THE WEEK ENDING MAY 29, 1998 WINDII was turned on briefly on May 24, but was then turned off for lack of power. *********** MPG *********** Routine processing of instrument Daily Activity Plans continues with no other problems. The MPG continues to assist the Project Scientist with the scheduling of instrument operations. *********** CDHF *********** The CDHF and UCSS developer successfully completed the UCSS 10.0 and MSS 4.0 software installation. The CDHF has received a total of 388 CD-ROM requests as of 29-May-1998. Two orders were received and shipped. The CDHF is successfully utilizing the new version of the CSC scheduler Enhancement (New Expansion Tool) in the Solstice v4.61 processing streams. The CDHF conducted a survey to determine the usage of the UOAS v4.71 UCSS/UOAS Interactive Services Input/Output screen. The survey was conducted in regards to PR 2590. Thanks to all for the quick response. UKMO is experiencing difficulty in transmitting data. They are currently working on the problem. 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 (1379R-1288C=91L) 60 days HAL (4.80) PROD (L1) (1868R-250C-2F=1616L) 43 days HAL (4.80) PROD (L3) (1868R-44C=1824L) 543 days SOL (4.61) PROD (L1) (2377R-543C=1834L) 76 days SOL (4.61) PROD (L3) (2304R-76C=2228L) 1 day SOL (4.61) PROD (TEST) (1R-1C=0L) 1 day SUS (6.3) PROD (1R-1C=0L) The CDHF received a request from FDF to begin receiving orbit data on a daily schedule with a two day time lag. Monday Orbit would be received on Wednesday.. Tuesday Orbit on Thursday etc. We asked that this schedule be put on hold until all parties involved are notified and in agreement. CDHF pending software upgrades: IDL 5.1, OpenIngres. *********** FOT *********** REPORTING PERIOD This report covers 16 May 1998 (Orbit 36484, GMT Day 136) through 22 May 1998 (Orbit 36587, GMT Day 142). 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 HALOE 139/1719 36539 Off MLS 140/0338 36545 On PEM 140/2224 36557 ZEPS Off PEM 141/0204 36559 ZEPS On The beta angle reached a minimum angle of 0.0 degrees on 05 May 1998 (DOY 125). The beta angle is now increasing toward a maximum angle of 78.0 degrees on 26 May 1998 (DOY 146). Spacecraft full-sun (i.e., no Earth eclipse) entry began on 21 May 1998 (DOY 141) and will continue until 31 May 1998 (DOY 151). 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 24.8 V end-of-night (EON) load bus voltage. Battery temperatures are falling (due to high beta angle and low depth- of-discharge) with a temperature delta between Battery 2 and Battery 3 of 0.8 degrees C. Additional battery performance data for each battery on 16 May 1998 and 22 May 1998 are provided in Appendix D. The clock error ranged from -9.5 to +12.1 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 = none % OUT-OF-LIMITS = none The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % FOT 04 % HALOE 01 % MLS 01 % PEM 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 03 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: Transponder A: 98/118 - 2287.497007 Transponder B: 98/120 - 2287.498907 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 98/134 show the observatory data loss to be 20 hours, 43 minutes, 22.452 seconds (an increase of 11.296 seconds since last report period). This is a 0.0356 percent data loss which equals a 99.9644 percent data capture for the mission. The increase of 11.296 seconds occurred over a two day period: 7 1.664 seconds on Day 131 due to hits in the data, and 7 9.632 seconds on Day 132 due to hits in the data and insufficient overlap. The data loss calculations supplied by Data Capture Facility (DCF) from mission start through UTC Day 98/141 show the observatory data loss to be 20 hours, 43 minutes, 29.652 seconds (an increase of 07.200 seconds since last report period). This is a 0.0355 percent data loss which equals a 99.9645 percent data capture for the mission. The increase of 07.200 seconds occurred over a four day period: 7 1.056 seconds on Day 137 due to hits in the data, 7 0.448 seconds on Day 138 due to hits on line, 7 0.512 seconds on Day 140 due to hits in the data, and 7 5.184 seconds on Day 141 due to hits in the data and on line. FDF reverted back to a daily ephemeris generation and delivery schedule on 21 May 1998 due to the increasing solar flux. FDF was no longer able to meet the allowable ephemeris transition tolerance requirement by generating ephemeris on a Monday/Wednesday/Friday schedule. The FOT made a few more modifications to the OBCSTF resident POCC database this week. These changes were supposed to be the last necessary to iron out all of the "kinks" in the Database 67 release. However, late this week, HRDI operations (Dave Gell) expressed interest in operating the HRDI instrument during spacecraft daylight period only. This new scenario will require a few additional database modifications. These changes most likely will be finalized early next week. UARS completed testing of the 32 kbps Q-channel dumps using the IP net on 14 May 1998. These tests were performed in parallel with the real-time operational (NASCOM) system using operational spacecraft data and the results were mirrored on both systems. However, commanding was performed only with the real-time system. All 32 kbps dump types were tested - Ephemeris (system table 33 & 34), Absolute Time Commands (ATC), and OBC bank dumps. Dump compares were executed automatically by the Applications Processor (AP) with no errors indicated. Testing the command side of the I/P Net is on hold. Testing will begin when MSOCC provides a command loop interface from the POCC through the I/P Net to the UARS Simulator. OTHER SIGNIFICANT EVENTS Continued testing of the upgrade to the OBC Power Monitor (PMON) flight software. Minor changes to both the flight software and supporting ground database were made during the week. PMON software modifications and testing continued. Multiple simulation runs to verify integrity of the latest modifications, database consistency with the new software, and testing of new features were executed. Work continues on the UARS orbit adjust planning scheduled for 05 August 1998. Additional options for an Orbit Adjust are being planned in the event that the B/D thrusters can not be safely used. Data from the original anomaly during which the hydrazine lines for the B and D attitude thrusters were depleted is being prepared for delivery to the Propulsion Branch (Dennis Asata). The Propulsion Branch stated that they cannot supply the latch valve driving circuits and that they must be supplied by some other source to complete the latch valve tests. UARS continues to assisted TOMS in reviewing the TOMS/EP Transmitter A failure data. FOT continues to support CNMOS in their efforts to make necessary software changes (MSOCC, CMS, DCF, etc.) to support the year 2000 rollover. Monitoring of the magnetic field model performance continues. FOT continues to improve a Power Profile for UARS based on 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 16 June 1998. The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust is targeted for 05 August 1998. PERSONNEL CHANGES Dimitrios Mantziaras, On-Line Evaluation Engineer transferred to an Off- Line Engineering position effective 13 May 1998. 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 22 May 1998 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 36503 137/0922 98-168 OBC Clk Adj fr 20.6 to 0.00 msec/day 36526 138/2040 98-169 OBC Clk Adj fr 0.00 to 20.6 msec/day 36539 139/1719 98-170 HALOE Power OFF 36545 140/0338 98-171 MLS Power ON 36557 140/2224 98-172 PEM Power OFF ZEPS 36559 141/0204 98-173 PEM Power ON AXIS 36569 141/1735 98-174 OBC Clk Adj fr 20.6 to 41.2 msec/day 36585 142/1920 98-175 OBC Reload RTs 12 _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 22 May 1998 MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ None this report period The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ None this report period APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 22 May 1998 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 36503 137/09:29 (17 May 98) from 20.6 to 00.0 msec/day 36526 138/20:44 (18 May 98) from 00.0 to 20.6 msec/day 36569 141/17:35 (21 May 98) from 20.6 to 41.2 msec/day _______________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 22 May 1998 16 May 1998 - GMT Day 136 Beta = 45.0 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 -3.05/-4.62 +0.0/ +0.0 18.2 0.000 0.0 2 +33.6/ -22.4 +6.11/+4.51 +28.4/-16.0 24.8 1.020 22.3 3 +67.2/ -5.6 +5.15/+3.23 +27.2/-16.8 24.8 1.022 21.8 22 May 1998 - GMT Day 142 Beta = 69.5 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 -3.68/-4.94 +0.0/ +0.0 18.4 0.000 0.0 2 +44.8/ -11.2 +3.87/+2.29 +20.0/-16.4 24.8 1.004 18.6 3 +67.2/ +0.0 +2.92/+1.34 +19.2/-16.4 24.8 1.012 18.1 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes APPENDIX E UARS ANOMALY REPORTS Week ending 22 May 1998 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 98-021 FOT 36509 137/1724 14170 Generic Late Acquisition 98-021 FOT 36514 138/0141 14170 Generic Late Acquisition 98-024 FOT 36572 141/2323 N/A TAC Crashed ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 98-024 FOT 36572 141/23:27 TAC 4 CRASH 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 ------ ------ ----- ---- --- ----------------- 98-021 Generic Late Acq for May 1998 (Open until 31 May 1998). SEVNTFW21