******************************************************************** UARS WEEKLY STATUS REPORT - 09 MAY 2003 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** Nothing received. *********** 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 26 April 2003 (Orbit 63571, GMT Day 116) through 02 May 2003 (Orbit 62675, GMT Day 122). 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 HRDI 119/0113 63616 FULLTIME OPERATIONS PEM 122/2321 63675 POWER OFF AXIS 1 The beta angle ranged between the angles of 70.3 degrees to 55.8 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 16 May 2003 (DOY 136). 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 0.63 to 0.95 degrees C. Additional battery performance data for each battery on 25 April and 02 May 2003 are provided in Appendix D. The clock error ranged from -11.3 to 7.0 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 HRDI = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 04 Four (4) 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 new switch was installed on 29 April 2003 and ran without incident all week. This hardware fix has hopefully resolved the network issues seen earlier this month. The preliminary build, which contained the fixes for the wait statement and status buffer display issues, was installed and tested on 30 April 2003. Testing showed that the wait statement logic worked properly for several operational procedures, but not with a test procedure which waited for a rapidly incrementing counter to reach a value. The status buffer still had several issues including, wrong time stamp, trickle LRVS and status buffer dumps not updating the display properly and old messages not being cleared properly. The FOT has written up their test result and sent them to the Raytheon development team for analysis. MEETINGS The FOT attended the weekly UARS DRB on 29 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 02 May 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 63591 117/0841 03-101 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 63616 119/0113 03-102 HRDI FULLTIME OPS 63662 122/0246 03-103 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 63675 122/2321 03-104 PEM POWER OFF AXIS 1 APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 02 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 02 May 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 63591 117/0846 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 63662 122/0248 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 02 May 2003 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 02 May 2003 - GMT Day 122 Beta = 55.8 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 -235.2/-263.2 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0 2 +05.6/-67.2 +3.87/+2.92 +23.2/-15.2 25.8 1.030 18.8 3 +16.8/-44.8 +2.92/+1.97 +22.4/-14.4 25.6 1.020 18.4 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 02 May 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-011 FOT 63576 116/0945 30832 Generic Late Acquisition 03-011 FOT 63622 119/0941 30832 Generic Late Acquisition 03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts 03-018 FOT 63648 121/0329 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-011 FOT See List April 03 30832 Generic Late Acquisition 03-016 FOT 63505 111/1550 NA Server 1 Tape Drive Install 03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts 03-018 FOT See List May 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 ------ ------ ----- ---- --- ----------------- 03-011 FOT See List April 03 30832 Generic Late Acquisition 03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts 03-018 FOT See List May 03 30832 Generic Late Acquisition