******************************************************************** UARS WEEKLY STATUS REPORT - 02 JUL 1999 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. *********** SUSIM *********** SUSIM was turned on as scheduled on June 30 after being off for 6 days. Completion of the turn-on procedure was delayed by telemetry problems at White Sands, resulting in the loss of solar data on June 30. Normal operations, including the planned "monthly" calibration scans of deuterium lamp spectra, were resumed on July 1. We are evaluating the recently reprocessed V20 products before their release to the DAAC. *********** ACRIM *********** Nothing received. *********** PEM *********** The PEM/AXIS activated on June 30. While AXIS is active, it produces energy deposition from 16 pixels based on precipitating electrons derived from measured X-ray fluxes. The PEM spectrometers continue to be active under PMON control. While under PMON control, the PEM instrument computed energy deposition from its particle spectrometers. The FOT and the PEM team are completing close-out documentation on the HEPS Energy Processor trouble; however progress has been hampered with the departure of Peter Thomas. *********** HALOE *********** HALOE continues successful operations with all engineering parameters within nominal operating range. HALOE science data products continue to be of excellent quality. *********** MLS *********** Nothing received. *********** 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 *********** 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. 10 days CLA (7.0) PROD (L1-L3) (475R-71C-8F=396L) 0 days GPI (4.05) PROD (MLS V5 3AL) (39R-0C-1F=39L) 50 days WIN (5.11) PROD (L1-L3) (1540R-837C-5F=698L) *********** FOT *********** REPORTING PERIOD This report covers 19 June 1999 (Orbit 42459 , GMT Day 170) through 25 June (GMT Day 176). 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 ACRIM 173/2334 42518 Off SUSIM 173/2334 42518 Off MLS 174/0129 42519 On The beta angle ranged between the angles of 22.7 degrees to 33.5 degrees for this report period. The beta angle is now increasing toward a maximum angle of 34 degrees on 26 June 1999 (DOY 177). 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 0.9 to 1.1 degrees C. Additional battery performance data for each battery on 18 June 1999 and 25 June 1999 are provided in Appendix D. The clock error ranged from 9.9 to -10.5 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 = 04 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % MLS 08 % FOT 02 % ACRIM 01 % SUSIM 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 01 No Anomaly Reports remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: Transponder A: 99/130 - 2287.496913 Transponder B: 99/151 - 2287.499087 GROUND SYSTEM OPERATION One (1) operational support problem 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 99/119 show the observatory data loss to be 24 hours, 13 minutes, 08.340 seconds (an increase of 0.000 seconds since the last report period). This is a 0.0356 percent data loss which equals a 99.9644 percent data capture for the mission. OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS FOT personnel are supporting the IMOC (SCS-21) development effort. The current work is a continuation of the SCS-21 UARS implementation effort done last year which culminated in a level 1 demonstration. 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 The end-to-end testing has been delayed until a new FORMATS software release can be made to accommodate the special Y2K planning aids. MEETINGS None FUTURE SIGNIFICANT EVENTS The next UARS Yaw Around Maneuver (reverse-to-forward) is scheduled for 10 July 1999 (DOY 191). 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 25 June 1999 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 42497 172/1355 99-207 OBC Clk Adj 0.00 to 20.6 msec/day 42517 173/2149 99-208 OBC Clk Adj 20.6 to 0.00 msec/day 42518 173/2334 99-209 ACRIM Power OFF 42518 173/2334 99-210 SUSIM Power OFF 42519 174/0129 99-211 MLS Power ON 42522 174/0721 99-212 MLS SCAN ACT OFF 42529 174/1700 99-213 MLS SCAN ACT ON 42534 175/0136 99-214 MLS MLS Stop/Run 42537 175/0710 99-215 MLS MLS Stop/Run 42543 175/1556 99-216 MLS MLS Stop/Run 42547 175/2231 99-217 MLS SCAN ACT OFF 42548 176/0014 99-218 MLS SCAN ACT ON/MPL Load _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 25 June 1999 MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ HRPTSPBIMON Y-HI PTS P/B Cur Mon 42489-90,94 HRPSEQBIMON Y-HI HRDI Q/B Cur Mon 42521 MLSCANACTTMP Y-LO MLS Scan Act Temp 42522 MLSCANACTTMP Y-LO MLS Scan Act Temp 42541 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ None this report period _______________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 25 June 1999 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 42497 172/13:55 (21 June 99) from 00.0 to 20.6 msec/day 42517 173/21:56 (22 June 99) from 20.6 to 00.0 msec/day APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 25 June 1999 18 June 1999 - GMT Day 169 Beta = 22.7 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 -95.2/-123.2 -2.73/-3.99 +0.0/ +0.0 16.5 0.000 0.0 2 +56.0/-5.6 +7.09/+5.15 +30.4/-15.2 23.8 1.021 22.7 3 +22.4/-50.4 +5.79/+4.19 +29.6/-16.0 23.7 1.024 22.5 25 June 1999 - GMT Day 176 Beta = 33.5 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 -95.2/-123.2 -2.42/-3.68 +0.0/ +0.0 16.5 0.000 0.0 2 +22.4/-39.2 +6.44/+5.47 +29.2/-15.2 24.2 1.023 22.5 3 +22.4/-67.2 +5.47/+4.51 +28.8/-15.6 24.2 1.025 22.2 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes V/T 5 APPENDIX E UARS ANOMALY REPORTS Week ending 25 June 1999 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-028 FOT 42493 172/0853 14170 Generic Late Acq. 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 ------ ------ ----- ---- --- ----------------- 99-028 FOT see list June 99 14170 Generic Late Acq. SEVNTFW99/26