******************************************************************** UARS WEEKLY STATUS REPORT - 28 MAY 1999 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. *********** SUSIM *********** SUSIM gathered its normal solar, offset, and occultation data without apparent problems. We are evaluating the recently reprocessed V20 products. *********** PEM *********** NOTHING RECEIVED. *********** HALOE *********** NOTHING RECEIVED. *********** 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. 5 days CLA (7.0) PROD (L1-L3) (22R-17C-4F=1L) 34 days PEM (3.32) PROD (OA-L2) (753R-752C-1F=0L) 5 days MLS (4.22) PROD (L1-L3) (JOB 2) (5R-5C=0L) 2 days SOL (4.62) PROD (L2-L3) (TEST) (2R-2F=0L) 72 days WIN (5.11) PROD (L1-L3) (1540R-584C-4F=952L) The CDHF completed a PEM 3.32 (OA-EXTRACT), Job 2 special request for a total of 752 days. The CDHF began the data migration from the current MSS to the new storage silo on 05/14/99. Two Level 0 platters have been successfully migrated. DAAC data created for the month of March, 1999 has been loaded into the DAAC Transfer Tables for HALOE, NMC, PEM, and UKMO. SOLSTICE Wall Clock time increase. "Several meetings were held with Barry Knapp to discuss approaches to solving the SOLSTICE problem. Plan to monitor Ingres file catalogue. SOLSTICE plans a new release in June and intends to request a mission reprocessing early this summer when the wall clock issue is resolved." CDHF pending software upgrades: DEC AXP Fortran 6.5, DEC AXP OPEN VMS 6.2, OpenIngres. *********** FOT *********** This report covers 15 May 1999 (Orbit 41934, GMT Day 135) through 21 May 1999 (GMT Day 141). 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 WINDII 137/1320 41972 Off WINDII 137/2006 41976 On WINDII 137/2150 41977 Off PEM 138/1438 41988 AXIS Off PEM 138/2301 41993 Off HRDI 139/1003 42000 Low Power MLS 139/1323 42002 Off WINDII 139/2122 42007 On MLS 140/1835 42020 On MLS 141/0119 42024 Off HRDI 141/1702 42034 Day Only The beta angle ranged between the angles of 55.9 degrees to 77.1 degrees for this report period. The beta angle is now decreasing toward a minimum angle of 0 degrees on 11 June 1999 (DOY 162). 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 23.7 V end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 0.5 to 0.7 degrees C. Additional battery performance data for each battery on May 14 1999 and May 21 1999 are provided in Appendix D. The clock error ranged from 11.5 to -10.3 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 = 01 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % WINDII 05 % MLS 03 % FOT 02 % PEM 02 % HRDI 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT 00 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: Transponder A: 99/117 - 2287.496987 Transponder B: 99/118 - 2287.498739 GROUND SYSTEM OPERATION Zero (0) 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 99/119 show the observatory data loss to be 24 hours, 12 minutes, 50.324 seconds (an increase of 10.976 seconds since the last report period). This is a 0.0361 percent data loss which equals a 99.9639 percent data capture for the mission. The increase of 10.976 seconds occurred over two (2) days: 7 1.824 seconds on Day 135 due to a data hit, 7 9.152 seconds on Day 140 due to no overlap. 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 to allow additional time for FDF to create special Y2K planning aids. UARS PROPULSION MODULE B/D THRUSTER LINE FILL - No change MEETINGS FOT attended the weekly IMOC meetings on 21 May 1999. FUTURE SIGNIFICANT EVENTS The next UARS Yaw Around Maneuver (forward-to-reverse) is scheduled for 11 June 1999 (DOY 162). 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 21 May 1999 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 41968 137/0721 99-170 WINDII WINDII Err Fix 41972 137/1320 99-171 WINDII Power OFF 41976 137/2006 99-172 WINDII Power ON 41977 137/2150 99-173 WINDII Power OFF 41988 138/1438 99-174 OBC Clk Adj 20.6 to 41.2 msec/day 41988 138/1438 99-175 PEM AXIS Power OFF 41993 138/2301 99-176 PEM Power OFF 42000 139/1003 99-177 HRDI Power OFF 42002 139/1323 99-178 MLS Power OFF 42007 139/2122 99-179 WINDII Power ON 42020 140/1835 99-167 MLS Power ON 42024 141/0119 99-180 MLS Power OFF due to s/c low power 42034 141/1702 99-181 HRDI Power ON (day only) 42035 141/1806 99-182 OBC Clk Adj fr 41.2 to 20.6 msec/day _______________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 21 May 1999 MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ WIQBCURRENT Y-LO WINDII Quiet Bus Current 42007-8 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ None this report period _______________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 21 May 1999 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 41988 138/14:42 (18 May 99) from 20.6 to 41.2 msec/day 42035 141/18:13 (21 May 99) from 41.2 to 20.6 msec/day APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 21 May 1999 14 May 1999 - GMT Day 134 Beta = 55.9 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 -78.4/-112.0 -3.68/-4.94 +0.0/ +0.0 16.5 0.000 0.0 2 +22.4/-28.0 +5.15/+3.87 +24.8/-16.4 23.8 1.013 21.0 3 +22.4/-50.4 +4.51/+2.60 +24.8/-17.2 23.8 1.016 20.8 21 May 1999 - GMT Day 141 Beta = 77.1 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 -89.6/-106.4 -2.11/-3.05 +0.0/ +0.0 16.5 0.000 0.0 2 +11.2/-11.2 +2.92/+1.34 +15.2/-16.0 25.1 1.077 12.8 3 +22.4/-44.8 +2.29/+0.71 +15.2/-16.0 25.1 1.081 12.6 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- -------- ---------- no changes V/T 5 APPENDIX E UARS ANOMALY REPORTS Week ending 21 May 1999 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- None this report period 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 ------ ------ ----- ---- --- ----------------- 99-023 FOT see list May 99 14170 Generic Late Acq SEVNTFW99/21