******************************************************************** UARS WEEKLY STATUS REPORT - 25 APR 2003 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM successfully gathered all of its daily mid resolution, weekly offset, and occultation scans this past week during periods of UARS telemetry. *********** ACRIM *********** Nothing received. *********** PEM *********** Nothing received. *********** 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 12 April 2003 (Orbit 63360, GMT Day 102) through 18 April 2003 (Orbit 63465, GMT Day 108). 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 PEM 102/1158 63367 POWER ON - DAY ONLY WINDII 103/1238 63383 POWER ON The beta angle ranged between the angles of 23.7 degrees to 48.9 degrees for this report period. The beta angle is now increasing towards a maximum angle of 70 degrees on 26 April 2003 (DOY 116). 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 1.59 to 1.92 degrees C. Additional battery performance data for each battery on 11 April and 18 April 2003 are provided in Appendix D. The clock error ranged from -9.9 to 9.9 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 = 02 PEM = 01 WINDII = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Four (4) 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 preliminary Eclipse build, which was expected on Tuesday, was delayed due to the status buffer issues. Raytheon requested a new telemetry capture file to test their functionality. This required bring up the UARS simulator, which did not work properly on Tuesday. The simulator was fixed by Thursday afternoon and the data file was sent to Denver on Friday. The FOT is waiting to hear back from Denver, as to whether or not the capture file allowed them to test their new code properly. If not then Denver will send someone out to Goddard to work with the FOT on testing the status buffer code. In the meantime the preliminary build is scheduled to come out on Monday, so that at least the WAIT code can be tested. UARS experienced some ground system problems this weekend. On Saturday at approximately 102/1400 GMT, the Eclipse primary configuration stopped updating telemetry. The workstations were rebooted and the configurations would not restart. At this point the offline engineers were notified and the FOD was told to call in the system administration support. Once the SA arrived, he rebooted the servers on three different occasions to no avail and finally rebooted the CISCO switches. The reboot of the switches solved the problem and the configurations were restored to their nominal state. Unfortunately, the online crew could not observe the spacecraft until 102/1921 GMT. No data was lost however since PACOR-A has their own realtime feed. More network issues were experienced throughout the week, specifically Tuesday and Friday. All indications lead back to CISCO switch one as the source of the problem. Eclipse system administrators are still investigating the problem and may order a replacement switch. The tape drive, which is used to capture the backups of the Eclipse system, was also found to be malfunctioning on Tuesday. A new drive was ordered and installed on Thursday afternoon, but this drive did not work either. Another new drive was ordered and will be installed next week. MEETINGS The FOT called a meeting on Tuesday to discuss the network issues seen over the weekend and discuss investigative actions and possible fixes. The FOT attended the weekly UARS DRB 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 16 May 2003 (DOY 136). This maneuver will be a Forward to Reverse 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 18 April 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 63367 102/1158 03-092 PEM POWER ON - DAY ONLY 63383 103/1238 03-093 WINDII POWER ON 63426 106/0911 03-094 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 63445 107/1558 03-095 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 18 April 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 18 April 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 63426 106/0917 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 63445 107/1604 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 18 April 2003 11 April 2003 - GMT Day 101 Beta = 19.4 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 -179.2/-212.8 -3.99/-4.94 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-78.4 +5.15/+3.55 +28.8/-14.4 25.1 1.020 19.5 3 +22.4/-22.4 +3.23/+2.60 +28.0/-14.4 25.1 1.010 19.0 18 April 2003 - GMT Day 108 Beta = 48.9 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 -190.4/-224.0 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-145.6 +5.47/+3.55 +25.2/-15.2 25.4 1.040 20.0 3 +22.4/-44.8 +4.51/+2.92 +24.8/-15.2 25.4 1.030 19.8 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 18 April 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-013 FOT 63368 102/1340 NA Eclipse Network Issues 03-011 FOT 63427 106/1149 30832 Generic Late Acquisition 03-011 FOT 63427 106/1149 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-011 FOT 63308 098/1349 30832 Generic Late Acquisition 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 ------ ------ ----- ---- --- ----------------- 03-009 FOT 63069 082/1624 N/A Invalid COP Status 03-013 FOT 63368 102/1340 NA Eclipse Network Issues 03-011 FOT 63427 106/1149 30832 Generic Late Acquisition 03-011 FOT 63427 106/1149 30832 Generic Late Acquisition