******************************************************************** UARS WEEKLY STATUS REPORT - 27 APR 2001 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM was switched off for 18-22 April because of spacecraft power constraints. Otherwise SUSIM performed its daily solar scans this past week during periods of predicted UARS telemetry. *********** ACRIM *********** Nothing received. *********** PEM *********** At the present time, PEM energy deposition from its spectrometers is not being generated. Recent data configuration changes have affected PEM software causing multiple failures. These failures are being reviewed by the PEM team. In order to correct for new telemetry requirements, PEM will need to update processing code with a patch delivery. The delivery patch may include changes which would allow the PEM software to execute on a DEC Alpha machine. GSFC is helping PEM with some DEC Alpha particulars which have caused PEM level 3 code to fail on DEC Alpha machines (software below level 3 executes on the DEC Alpha). PEM has examined its processed files of the rehost machine and has found that no differences exist in the Level 1 and Level 2 output files which were generated the rehost when the same input data was used on CDHF and CDHFB. PEM is now confident that output generated by PEM 3.32, Jobs 1 & 2, on the rehost system is valid and correct. The PEM team is working on replacing the PEM:: machine with a DEC Alpha machine to be called PEM2K::. Tests of the NRT data transfer from CDHF2:: through PEM2K:: to the unix computer running the PEM GSE software show no difference between equivalent NRT files transferred from PEM::. Thus, NRT data from CDHF2:: is captured correctly on PEM2K::. Tests of the NRT data transfer from CDHFB:: were not successful from both PEM:: and PEM2K::. Results of the test of NRT data transfers from the rehost computer were successful for individual files which exist on CDHFB::. PEM will participate in the NRT data flow to capture NRT data from CDHFB:: when specified by GSFC. PEM has been working with GSFC on allowing commanding of the PEM instrument by creating DAPs on the PEM2K machine and submitting them to the CMS. So far, this has not been achieved. It was discovered that PEM2K is running Openwindows version 7.2-1 which operates differently across the network than Openwindows version 7.1-2 (the CDHFB operating system). Compaq is investigating to determine a solution. In the mean time, Steve Bove made some suggestions which seem to have improved the PEM2K:: to UCMS:: image execution ability; however, the CMS has had troubles recently and it appears that the UCMS:: definitions for PEM2K:: must not be correct on the UCMS:: node. PEM is waiting on a reply back from GSFC. Updated HEPS calibration parameters have been finalized and are ready for delivery. Updated MEPS quality calibration files have been finalized and are ready for delivery. Level 3 software errors, discovered by Dr. Dean Pesnell, have been fixed; his suggestions have been incorporated with in the PEM production code. Both updated HEPS and MEPS calibration data, along with the Level 3 code changes, will influence the in-situ energy deposition predictions, so new versions of PEM energy deposition Level 3 files will be generated. *Beginning of power orbit day (PEM activation): array current >5 amps, array voltage >53.5 volts, and battery current >2.0 amps. End of power orbit day (PEM deactivation): time in power orbit day >4 minutes, array current <9 amps, and battery currents <0.2 amps. Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta. *********** HALOE *********** Nothing received. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing received. *********** MPG *********** Daily processing of instrument Daily Activity Plans continues with no problems. Instrument operations schedule is now complete to 30 May 2001. *********** CDHF *********** HIGHLIGHTS ---------- - All level 0 data from the power outage time frame are available. UARS CDHF REHOST ---------------- - Additional 2 weeks have been requested to confirm "puts" to silo. Once this is done we are able to go operational. We are anxious to go operational on the REHOST due to resource requirements needed to run two clusters. *********** FOT *********** REPORTING PERIOD This report covers 14 April 2001 (Orbit 52321, GMT Day 104) through 20 April 2001 (Orbit 52425, GMT Day 110). 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 106/0241 52457 Power OFF SUSIM 109/0006 52500 Power OFF ACRIM 109/0006 52500 Power OFF PEM 109/0106 52501 Power OFF HRDI 109/2313 52515 Low Power A Reverse-to-Forward Yaw Around maneuver (number 98) was successfully executed in Orbit 52510 beginning 109/16:01:03 and completing at 109/16:38:00 on 19 April 2001. The SOLSTICE instrument was in day only and all other instruments were in their off or standby mode (including HRDI and PEM). Due to the SA position at 269 degrees, the effective night length of the spacecraft after the maneuver was approximately 55.9 minutes. Post maneuver analysis of data indicate that during the Yaw Around, the end-of-night load bus voltage was 23.90 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 22.8 and 23.0 percent respectively. The next (forward-to-reverse) YAW is scheduled for 30 May 2001 (DOY 150). The beta angle ranged between the angles of -24.2 degrees to +1.4 degrees for this report period. The beta angle is now increasing towards a maximum angle of 74 degrees on 09 May 2001 (DOY 129). 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 1.3 and 1.6 degrees C. Additional battery performance data for each battery on 13 April 2001 and 20 April 2001 are provided in Appendix D. The clock error ranged from Ð13.2 to 13.4 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 = 00 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). ¥ FOT = 18 ¥ HALOE = 01 ¥ SUSIM = 01 ¥ ACRIM = 01 ¥ PEM = 01 ¥ HRDI = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. ¥ FOT = 02 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: · Transponder A: 00/316 - 2287.496493 · Transponder B: 01/087 - 2287.499152 GROUND SYSTEM OPERATION Two (2) 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 01/067 show the observatory data loss to be 300 hours, 3 minutes, 5.464 seconds. This shows an increase of 1 minute and 52.704 seconds since the last report period. This is a 0.39 percent data loss, which equals a 99.61 percent data capture for the mission. · 15.424 seconds on Day 107 due to a Data Hit, · 1 minute and 37.280 seconds on Day 108 due to a Data Hit. OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS UARS is using both the Fine Sun Sensor (FSS) and the Three Axis Magnetometer (TAM) as inputs to UFLTR this week. The FOT is pleased with their performance, but continues to make adjustments to the TAM alignment to improve its performance and UARSÕ attitude. The FSW patch that will improve the magnetic field model from a 5th order to 7th order solution has been completed. The patch requires one further test next week before the planned uplink date of 25 April 2001. MEETINGS The FOT attended a UARS TAC RS Replacement Meeting on Wednesday, April 18, 2001.The FOT attended the UARS SERB Meeting on Wednesday, April 18, 2001. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 30 May 2001 (DOY 150). 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 20 April 2001 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 52430 104/0750 01-231 NBTR NOOPS D-104 52437 104/1805 01-232 NBTR NOOPS D-105 52443 105/0420 01-233 OBC/CLK Clk Adj 0.00 to -20.6 msec/day 52444 105/0646 01-232 NBTR NOOPS D-105 52452 105/1805 01-234 NBTR NOOPS D-106 52457 106/0241 01-235 HALOE Power OFF 52459 106/0605 01-236 OBC/CLK Clk Adj -20.6 to 0.00 msec/day 52460 106/0754 01-234 NBTR NOOPS D-106 52465 106/1443 01-237 OBC/CLK Clk Adj 0.00 to 20.6 msec/day 52478 107/1207 01-238 OBC/CLK Clk Adj 20.6 to 0.00 msec/day 52483 107/2010 01-239 OBC/TAM MAGMOD Time Update 52488 108/0424 01-240 OBC Clk Adj fr 0.00 to -20.6 msec/day 52493 108/1211 01-241 NBTR PBK 52500 109/0006 01-242 SUSIM Power OFF 52500 109/0006 01-243 ACRIM Power OFF 52501 109/0106 01-244 PEM Power OFF 52501 109/0106 01-245 SOLSTICE TO DAY OPS ONLY 52508 109/1209 01-246 OBC/CLK Clk Adj -20.6 to 0.00 msec/day 52510 109/1529 01-250 OBC/ACS YAW MANEUVER 52510 109/1529 01-249 OBC/CLK Clk Adj 0.00 to 20.6 msec/day 52510 109/1529 01-247 OBC/TAM TAM TO MONITOR MODE 52512 109/1842 01-248 OBC/TAM TAM TO UPDATE MODE 52515 109/2313 01-251 HRDI Low Power 52525 110/1617 01-252 OBC Clk Adj fr 20.6 to 0.00 msec/day ________________________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 20 April 2001 The following Out-Of-Limits occurrences were detected: MNEMONIC STATE DESCRIPTION ORBITS -------- ----- ----------- ------ HRIFESURVTMP Y-HI HRDI IFE Survival Htr Temp 52517 HRRADTEMP Y-HI HRDI Radiator Temp 52517 The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS -------- ----------- ------ -None this report period _____________________________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 20 April 2001 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 52443 105/0420 Clk Adj fr 0.00 to -20.6 msec/day 52459 106/0605 Clk Adj fr -20.6 to 0.00 msec/day 52465 106/1443 Clk Adj fr 0.00 to 20.6 msec/day 52478 107/1207 Clk Adj fr 20.6 to 0.00 msec/day 52488 108/0424 Clk Adj fr 0.00 to -20.6 msec/day 52508 109/1209 Clk Adj fr -20.6 to 0.00 msec/day 52510 109/1529 Clk Adj fr 0.00 to 20.6 msec/day 52525 110/1617 Clk Adj fr 20.6 to 0.00 msec/day ________________________________________________________________________ APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 20 April 2001 13 Apr 2001 - GMT Day 103 Beta = 27.8 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 +67.2/+44.8 -3.05/-4.31 +0.0/+0.0 13.0 0.000 0.0 2 +11.2/-100.8 +6.44/+5.15 +29.6/-15.6 24.0 1.040 21.8 3 +22.4/-67.2 +5.47/+3.87 +28.8/-16.0 23.8 1.030 21.7 20 Apr 2001 - GMT Day 110 Beta = 01.4 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 +621.6/+280.0 -3.68/-4.94 +0.0/+0.0 12.3 0.000 0.0 2 +22.4/-67.2 +5.15/+3.87 +28.8/-12.8 25.1 1.020 20.5 3 +22.4/-67.2 +3.87/+2.60 +28.0/-12.8 25.0 1.020 20.0 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ---- ---- --------- -no changes V/T 5 _____________________________________________________________________________ APPENDIX E UARS ANOMALY REPORTS Week ending 20 April 2001 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 01-019 FOT 52501 109/0146 14170 Generic Late Acquisition 01-019 FOT 52506 109/0944 14170 Generic Late Acquisition 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 ------ ------ ----- ---- --- ----------------- 01-019 FOT see list Apr 01 14170 Generic Late Acquisition SEVNTFW01/16