******************************************************************** UARS WEEKLY STATUS REPORT - 02 May 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. The solar pointing provided by the SSPP in closed loop pointing mode has been superb. *********** 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 19 April 2003 (Orbit 63465, GMT Day 109) through 25 April 2003 (Orbit 63570, GMT Day 115). 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 110/0021 63480 POWER OFF PEM 110/1406 63489 AXIS 1 POWER ON The beta angle ranged between the angles of 55.1 degrees to 69.8 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 1.26 to 1.27 degrees C. Additional battery performance data for each battery on 18 April and 25 April 2003 are provided in Appendix D. The clock error ranged from -7.2 to 10.3 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 HALOE = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 04 Two (2) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Four (4) 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 ground system problems experienced last weekend have prompted the replacement of UARS CISCO switch one. This will be performed on Tuesday of next week, with the existing switch 2 left in place. This should eliminate the problems that were seen regarding the bad ports and provide more stability to the UARS network. The FOT also received the delivery of both the WAIT statement fix and the status buffer code. This code will be installed on the prototype after the switch is replaced. Once installed it should only take a day to test the functionality and report back to the Raytheon sustaining engineering team. The tape drive that was also found to be malfunctioning last week has also been replaced. This means that the backups of the ground system files can resume. New software is also on order to make these backups more reliable and should be installed sometime in the next three weeks. MEETINGS The FOT attended the weekly UARS DRB on 22 April 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 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 25 April 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 63480 110/0021 03-096 HALOE POWER OFF 63487 110/1040 03-097 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 63489 110/1406 03-098 PEM AXIS 1 POWER ON 63563 115/1211 03-099 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY 63565 115/1503 03-100 WINDII CLEAR ERROR CODE E03 APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 25 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 25 April 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 63487 110/1045 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 63563 115/1215 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 25 April 2003 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 25 April 2003 - GMT Day 115 Beta = 69.8 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 -207.2/-229.6 -3.05/-3.99 +00.0/+00.0 08.3 0.000 0.0 2 +05.6/-22.4 +3.23/+1.97 +16.8/-15.2 26.4 1.060 16.3 3 +16.8/-22.4 +2.60/+1.34 +16.8/-15.2 26.4 1.050 16.1 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 25 April 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-015 FOT 63493 110/2015 30832 Generic Late Acquisition & WS Reboot 03-016 FOT 63505 111/1550 NA Server 1 Tape Drive Install 03-011 FOT 63565 115/1541 30832 Generic Late Acquisition 03-011 FOT 63569 115/2225 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED 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 See List April 03 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 ------ ------ ----- ---- --- ----------------- 03-015 FOT 63493 110/2015 30832 Generic Late Acquisition& WS Reboot 03-016 FOT 63505 111/1550 NA Server 1 Tape Drive Install