******************************************************************** UARS WEEKLY STATUS REPORT - 30 May 2003 ******************************************************************** *********** SOLSTICE *********** During this week, SOLSTICE continued to operate in good health gathering solar data on all available orbital tracking periods. *********** SUSIM *********** SUSIM has successfully gathered all of its daily mid resolution, weekly offset, and O2 occultation scans this past week during periods of UARS telemetry or during periods of onboard tape recording. *********** 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 *********** Nothing received. *********** 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 17 May 2003 (Orbit 63886, GMT Day 137) through 23 May 2003 (Orbit 63991, GMT Day 143). 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 SOLSTICE 138/1318 63909 DAY ONLY TO FULL TIME SUSIM 138/1604 63911 POWER ON HALOE 141/1310 63954 POWER ON PEM 143/1311 63985 POWER ON DAY ONLY The beta angle ranged between the angles of 3.4 degrees to 31.2 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 0.65 degrees C. Additional battery performance data for each battery on 16 May and 23 May 2003 are provided in Appendix D. The clock error ranged from -8.8 to 10.1 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 = 03 SOLSTICE = 01 SUSIM = 01 HALOE = 01 PEM = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Two (2) 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 The FOT successfully completed another UARS yaw maneuver on 16 May 2003. The VT-6 duration lasted for approximately two days, which is one full day longer than the previous yaw maneuvers. The two-day duration will be used for the remainder of the summer. After which an analysis will have to be done to determine the duration needed for the fall and winter yaw maneuvers. The duration may be scaled back or left the same depending on the performance of the batteries throughout the summer. More eclipse testing of the status buffer functionality was done on 19 May 2003. All functionality worked properly except for the time value on status buffer messages received in the blind. When these messages are received the algorithm that determines the proper time has trouble determining the last rollover time. This issue is being looked at but the new build will be delivered with this problem unresolved. MEETINGS The FOT also attended the weekly UARS DRB on 20 May 2003, to review the open DRs and discuss the details of the next Eclipse software delivery. At this meeting the DR written about the derived equation problem was raised to a severity one DR. 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 23 May 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 63903 138/0221 03-117 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 63909 138/1233 03-118 MPS FROM VT 6 TO VT 5 63909 138/1318 03-119 SOLSTICE DAY ONLY TO FULL TIME 63911 138/1604 03-120 SUSIM POWER ON 63912 138/1642 03-121 MPS RESET BATTERY STATE OF CHARGE 63923 139/1133 03-120 SUSIM POWER ON (COMPLETE) 63954 141/1310 03-122 HALOE POWER ON 63959 141/1924 03-123 HALOE POWER ON (COMPLETE) 63985 143/1311 03-124 PEM POWER ON DAY ONLY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 23 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 23 May 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 63903 138/0221 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 23 May 2003 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 23 May 2003 - GMT Day 143 Beta = 31.2 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 -700.0/-700.0 -3.05/-3.99 +00.0/+00.0 07.2 0.000 0.0 2 +00.0/-22.4 +5.15/+4.51 +11.2/-14.0 26.1 1.020 21.0 3 +11.2/-22.4 +3.87/+3.23 +11.2/-13.6 26.1 1.010 20.0 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 63909 138/1233 LV6 -> LV5 APPENDIX E UARS ANOMALY REPORTS Week ending 23 May 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-026 FOT 63922 139/0913 32822 White Sands Record Prob 03-018 FOT 63944 140/2109 30832 Generic Late Acquisition 03-018 FOT 63959 141/2007 30832 Generic Late Acquisition 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) 03-022 FOT 63742 127/0929 N/A PBK PROBLEM(REF 03-019) 03-024 FOT 63852 134/1745 N/A Bad CISCO Switch No.2 03-025 FOT 63884 136/2016 32813 Data Dropout 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 03-026 FOT 63922 139/0913 32822 White Sands Record Prob