******************************************************************** UARS WEEKLY STATUS REPORT - 28 JUL 2000 ******************************************************************** *********** SOLSTICE *********** This week's large solar pointing excursions (15 arcminutes at times) are still within our calibrations so have minimal affect our solar data. Additionally, we continue to gather enough data to meet all the SOLSTICE science objectives during this period of reduced tape recorder operations. SOLSTICE is in good health, collecting solar data on all available orbital tracking periods and stellar calibration observations whenever possible. Level 2 processing is halted due to bugs in the OA_SSPP_ATT service. CDHF and CSC personnel are working on the problem. *********** SUSIM *********** SUSIM successfully conducted its yearly calibration scans involving all 4 deuterium lamps. Otherwise, the instrument continues to gather a normal set of daily solar scans scheduled for periods of predicted telemetry. *********** ACRIM *********** Nothing received. *********** PEM *********** Nothing received. *********** HALOE *********** HALOE has been off during this full graze period. HALOE is schedule to turn on beginning of day August 2, 2000. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing received. *********** MPG *********** Processing of instrument Daily Activity Plans continues with no problems. We are continuing to coordinate with the Flight Operations Team and to assist the Project Scientist in scheduling of instrument operations. The schedule for instrument operations during the next yaw period (11 August to 17 September) has been distributed and posted on the web.(http://umpgal.gsfc.nasa.gov/) The MPG attended a meeting to discuss the status of Fixed Head Star Tracker 1 on Wednesday, July 26, 2000. *********** 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. 2 days SEN (5.0) PROD (1992) (2R-2C=0L) Data created in the month of May, 2000 has been loaded into the DAAC Transfer Tables for HALOE, NMC, and UKMO. DAAC has been notified. UARS CDHF REHOST: - Intentions are on July 31,2000 to begin running current day processing, Level 0 and NRT Ingest on both the present production and rehost systems. Approximate duration 2 weeks. After this period (assuming no problems found) we would then like PI/SW reps to use the REHOST system the primary system for LO ,NRT and current day processing. PAC and Production will notify PI software reps regarding data transfer and account access on the Rehost. - Successful processing on Rehost System: Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, HRDI, MLS, SUSIM, Solstice, and WINDII. - The HRDI group has validated the V4.4 output product created on the Rehost System. - A re-linking of all the PI software tested has been done. - United Kingdom Meteorological Office is sending daily Correlative (UKMO) data to the Rehost System. Needed for HALOE and HRDI production processing. Same data continues to be sent to the current system. No differences when comparing rehost and current files. - A daily Auxiliary (SOL) file is now being received on the Rehost System. Needed for HALOE Production processing. Same data continues to be sent to the current system. Found no differences when comparing rehost and current files. - Production control has tested all PI software that has been re-compiled and re-linked with the rebuilt UCSS shared image software. Test days were run against UARS DAYS 3206 - 3213 that were electronically ingested on the Rehost System. Results are being compared against same test days that were successfully processed before UCSS rebuild. *********** FOT *********** REPORTING PERIOD This report covers 15 July 2000 (Orbit 48332, GMT Day 197) through 21 July 2000 (Orbit 48436 , GMT Day 203). 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 200/2346 48391 Off WINDII 201/0126 48392 On PEM 202/2210 48420 On, 7w PEM 203/2032 48434 On, PMON WINDII 203/2351 48436 Off AXIS-1 204/2353 48451 Off The beta angle ranged between the angles of 38.5 degrees to 67.2 degrees for this report period. The beta angle is now increasing toward a maximum angle of +76 degrees on 25 July 2000 (DOY 207). 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 0.7 to 1.0 degrees C. Additional battery performance data for each battery on 14 July 2000 and 21 June 2000 are provided in Appendix D. The clock error ranged from -11.7 to 11.6 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. % OUT-OF-LIMITS = 02 % ALERTS = 01 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % FOT = 09 % WINDII = 03 % PEM = 03 % HALOE = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT = 00 Two (2) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: - Transponder A: 00/145 - 2287.497008 - Transponder B: 00/152 - 2287.498920 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 00/202 show the observatory data loss to be 296 hours, 38 minutes, 23.737 seconds (an increase of 1 minute 20.896 seconds since the last report period). This is a 0.40 percent data loss which equals a 99.60 percent data capture for the mission. The increase of 1 minute 20.896 seconds occurred over two (2) days: - 0 minutes 55.728 seconds on Day 189 due a late acquisition, - 0 minutes 25.168 seconds on Day 193 due to a data hit. OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS UARS continues to operate this week using FHST-1 and the FSS as its update sensors for attitude control. FHST-1 has shown, as expected, degraded performance. A scale factor calibration was made to FHST-1 on 17 July 2000 and an alignment calibration on 21 July 2000. These calibrations were given to the FOT by FDF and should help to correct the error in the star tracker. The FOT will continue to monitor the data to see how much of an improvement the calibrations have made to UARSU pointing. The FOT has delayed the testing of the new TMONs until the FHST-2 anomaly is resolved. No time frame has been set as to when testing will resume. The FOT has begun writing the online procedure for safehold should it happen before the new TMONs are in place or during and OBC halt. This procedure will be tested on the simulator and put online for immediate execution should an anomalous condition take place. MEETINGS The FOT attended a meeting to discuss FHST-1 on 19 July 2000. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for August 14, 2000 (DOY 227). This maneuver will be a Forward to Reverse Flight maneuver (Northern Hemisphere viewing). 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 July 2000 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 48379 200/0422 00-348 NBTR PLAYBACK 48380 200/0603 00-348 NBTR NOOPS D200 48391 200/2346 00-351 HALOE Power OFF 48392 201/0126 00-352 WINDII Power ON 48393 201/0309 00-353 WINDII WINDII ALERT CLEAR 48394 201/0424 00-354 NBTR PLAYBACK 48399 201/1147 00-355 OBC Clk Adj fr 0.00 to 20.6 msec/day 48409 202/0426 00-356 NBTR PLAYBACK 48420 202/2210 00-299 PEM "Power ON, 7w" 48424 203/0428 00-357 NBTR PLAYBACK 48433 203/1809 00-358 OBC Clk Adj 20.6 to 41.2 msec/day 48434 203/2032 00-359 PEM Power ON - DAY ONLY 48435 203/2129 00-360 OBC FHST-1 ALIGNMENT 48436 203/2351 00-362 WINDII Power OFF 48439 204/0430 00-361 NBTR PLAYBACK 48451 204/2353 00-363 AXIS-1 Power OFF _______________________________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 21 July 2000 The following Out-Of-Limits occurrences were detected: MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ HRPSEQBIMON Y-HI PSE QB CURRENT MON 48381 WIISUTEMP Y-LO WINDII ISU TEMP 48381 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ WIMCCNOK WINDII SCAN MIRROR IMPROPER FUNCTION 48393 _______________________________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 21 July 2000 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 48399 201/12:00 (19 July 00) from 0.00 to 20.6 msec/day 48433 203/18:27 (21 July 00) from 20.6 to 41.2 msec/day ___________________________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 21 July 2000 14 July 2000 - GMT Day 196 Beta = 38.5 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 +56.0/+33.6 -3.05/-4.31 +0.0/+0.0 15.5 0.000 0.0 2 +50.4/-56.0 +5.79/+4.51 +28.0/-15.2 25.0 1.030 22.0 3 +22.4/-33.6 +5.15/+3.23 +27.2/-16.4 25.0 1.030 22.0 21 July 2000 - GMT Day 203 Beta = 67.2 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 +56.0/+39.2 -3.05/-4.62 +0.0/+0.0 15.5 0.000 0.0 2 +16.8/-11.2 +3.55/+1.97 +19.2/-15.2 26.1 1.040 17.4 3 +22.4/-11.2 +2.60/+1.34 +19.2/-15.2 25.9 1.030 17.1 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- ---------- ---------- no changes V/T 5 _______________________________________________________________________________ APPENDIX E UARS ANOMALY REPORTS Week ending 21 July 2000 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 AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 00-026 FOT see list June 00 14170 Generic Late Acq. 00-032 FHST 48211 188/2242 N/A FHST 2 Anomaly SEVNTFW00/29