******************************************************************** UARS WEEKLY STATUS REPORT - 23 May 2003 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM resumed operations on May 19 after the shutdown for the yaw-around. Since then, the instrument has successfully gathered all of its daily mid resolution, weekly offset, and O2 occultation scans this past week during periods of UARS telemetry or tape recording segments. *********** ACRIM *********** Nothing received. *********** PEM *********** The PEM web site has moved. It has a new URL. Access the PEM web site using http://wwwpem.space.swri.edu. The PEM data from the GUVI conjunction periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html. Level 2 PEM HEPSA data files are being reprocessed for submission to the DAAC. This data has been designated as version 2; however, there is no format difference from the version 1 data format. Version 2 HEPSA data is being generated because it was discovered that there exists processing errors within some of the HEPSA version 1 data files. Thus, if you are using any HEPSA version 1 data files from the DAAC, please replace them with the version 2 data files. Currently, HEPSA data between 1991274 and 2001365 has been reprocessed and archived at the GSFC DAAC. SwRI is working on reprocessing data PEM for 2002. PEM continues to work with the GUVI team on the diagnosis of data from the first conjunction period. Analysis of the two conjunction passes showed that the aurora as detected by GUVI was at higher latitude than UARS. GUVI images from other times from the first conjunction period show spatial regions that both GUVI and PEM sampled when aurora was present. Separation is several minutes to 10's of minutes when both instruments saw aurora. PEM has seen no aurora during the second conjunction period. Due to a spacecraft anomaly, no PEM data was collected during the third conjunction period. PEM continues to receive NMC data files from NOAA. No problems have been encountered. NOAA has changed the binary structure of the NMC data and PEM is now receiving two data streams, one in the original VAX format and the other from their new binary format. *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 *********** HALOE resumed normal operations on May 21 after the yaw maneuver. A replacement for the failed AIX IBM computer has been installed at Langley and access to the HALOE plots and data files has been restored via the HALOE Website. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing received. *********** MPG *********** The MPG continues to serve as the point-of-contact for UARS instrument operations in support of the Science Traceability Mission of UARS. Daily processing of instrument Daily Activity Plans continues with no problems. *********** CDHF *********** Nothing received. *********** FOT *********** REPORTING PERIOD This report covers 10 May 2003 (Orbit 63781, GMT Day 130) through 16 May 2003 (Orbit 63886, GMT Day 136). 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 HALOE 133/0438 63825 POWER OFF PEM 133/2006 63839 POWER OFF SUSIM 134/2150 63855 POWER OFF A Forward-to-Reverse Yaw Around maneuver (number 119) was successfully executed in Orbit 63881 beginning 136/15:43:10Z and completing at 136/16:20:20Z on 16 May 2003. All instruments were in their off or standby mode (except for SOLSTICE in day-only). Due to the SA position at 269 degrees, the effective night length of the spacecraft after the maneuver was approximately 57.89 minutes. Post maneuver analysis of data indicate that during the Yaw Around, the end-of-night load bus voltage was 25.12 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 20.97 and 20.39 percent respectively. The next (reverse-to-forward) YAW is scheduled for 14 June 2003 (DOY 165). The beta angle ranged between the angles of 21.6 degrees to 1.5 degrees for this report period. The beta angle is now increasing towards a maximum angle of 35 degrees on 31 May 2003 (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 23.6 V end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 0.64 to 1.27 degrees C. Additional battery performance data for each battery on 09 May and 16 May 2003 are provided in Appendix D. The clock error ranged from -10.2 to 11.2 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 = 00 ALERTS = 00 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 PEM = 01 SUSIM = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Three (3) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Three (3) operational support problems occurred this period. Anomaly Reports are included in Appendix E. The data loss calculations are no longer being supplied by Data Capture Facility (DCF). OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS Two issues were found with the Eclipse ground system this week. The first problem was very similar to the network anomaly of 12 April 2003. In April the root cause of the anomaly was the faulty CISCO switch #1, which has since been replaced and loaded with new firmware. The other switch, CISCO switch #2, was left alone following that anomaly. In this week's anomaly CISCO switch #2 triggered a spanning tree problem, which overloaded the operational network, but the new switch #1 remained intact. Due to this fact, the problem was believed to be due the old firmware. A MOCR was written and approved by the NASA Mission Director and the new firmware was installed on switch #2 that afternoon. No signs of the anomaly were exhibited since this install. The second issue found was an issue with the derived LRVs in Eclipse. The procedure to dump the tape recorder began triggering error messages on 06 May 2003. Investigation of these messages lead to an analysis of two derived LRVs that this procedure uses to verify proper modes. These two derived LRVs were not updated correctly and after several different tests, the FOT believes this to be due to the fact that they do not come out of their initial state properly. The Raytheon team has been notified and a DR was written. Until the problem is resolved the online crew is manually verifying the proper modes before continuing with the tape recorder dump procedure. The FOT successfully completed another UARS yaw maneuver on 16 May 2003. The batteries were set to VT-6 one orbit prior to the yaw and will remain in VT-6 until telemetry indicates it should be set back to the nominal VT-5 level. The VT-6 period will not exceed 3 days and should be set back to VT-5 prior to any instrument turn-ons. MEETINGS The FOT also attended the weekly UARS DRB on 13 May 2003, to review the open DRs and discuss the details of the next Eclipse software delivery. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 14 June 2003 (DOY 165). This maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere viewing). Attachments: Appendix A, Real-time Command 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 16 May 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 63796 130/2342 03-109 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 63815 132/0549 03-110 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 63825 132/2256 03-111 HALOE POWER OFF 63839 133/2006 03-112 PEM POWER OFF 63855 134/2150 03-113 SUSIM POWER OFF 63880 136/1409 03-115 MPS V/T L-5 TO V/T L-6 (YAW) 63880 136/1448 03-115 MACS TAM TO MONITOR MODE 63881 136/1616 03-115 MACS SAFEHOLD RECONFIG/TAM ALGN MATRIX 63882 136/1645 03-115 MACS TAM TO UPDATE MODE/OPS MEM MON 63883 136/1832 03-116 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 16 May 2003 The following Out-Of-Limits occurrences were detected: 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 16 May 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 63796 130/2342 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 63815 132/0549 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 63883 136/1835 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 16 May 2003 09 May 2003 - GMT Day 129 Beta = 28.0 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 -700.0/-700.0 -3.05/-4.62 +00.0/+00.0 07.7 0.000 0.0 2 +11.2/-78.4 +5.15/+3.87 +28.4/-15.2 23.8 1.040 20.2 3 +22.4/-72.8 +3.87/+2.60 +27.2/-15.2 23.8 1.030 19.9 16 May 2003 - GMT Day 136 Beta = 01.5 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 -700.0/-700.0 -3.68/-4.94 +00.0/+00.0 07.2 0.000 0.0 2 +11.2/-100.8 +4.51/+3.87 +28.0/-13.2 26.2 1.020 21.0 3 +22.4/-44.8 +3.87/+2.60 +26.8/-12.8 26.2 1.010 20.0 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 63880 136/1409 LV5 -> LV6 APPENDIX E UARS ANOMALY REPORTS Week ending 16 May 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-018 FOT 63829 133/0438 30832 Generic Late Acquisition 03-024 FOT 63852 134/1745 N/A Bad CISCO Switch No.2 03-025 FOT 63884 136/2016 32813 Data Dropout ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-019 FOT 63727 126/1008 N/A SEC Eclipse (PBK Problem) 03-020 FOT 63732 126/1334 32470 DROPOUTS ON I CHANNEL 03-021 FOT 63733 126/1943 32743 Late Acq 15 min recoverable 03-022 FOT 63742 127/0929 N/A PBK PROBLEM(REF 03-019) 03-023 FOT 63773 129/1105 32761 MULTIPLE DATA DROPOUTS ANOMALY INVESTIGATION REPORTS GENERATED AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-018 FOT See List May 03 30832 Generic Late Acquisition 03-024 FOT 63852 134/1745 N/A Bad CISCO Switch No.2 03-025 FOT 63884 136/2016 32813 Data Dropout