******************************************************************** UARS WEEKLY STATUS REPORT - 7 November 2003 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continus to operate in good health gathering solar data on all available orbital tracking periods. This week we received about 60% of each day's data amounting to about 550 minutes of solar observing time per day. *********** SUSIM *********** SUSIM successfully gathered all of its daily mid (1.1 nm) resolution, weekly offset, and O2 occultation scans during periods of UARS telemetry or 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 2002365 has been reprocessed and archived at the GSFC DAAC. 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 25 October 2003 (Orbit 66307, GMT Day 298) through 31 October 2003 (Orbit 66412, GMT Day 304). 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 PEM (Z/H) 298/1220 66315 DAY ONLY TO FULLTIME OPS PEM (Z/H) 301/2005 66365 FULLTIME TO DAY ONLY OPS PEM AXIS 301/2227 66366 AXIS-2 OFF PEM (Z/H) 302/1538 66377 DAY ONLY TO FULLTIME OPS PEM (Z/H) 303/1208 66390 FULLTIME TO DAY ONLY OPS HALOE 303/1310 66390 POWER ON The beta angle ranged between the angles of 65.5 degrees to 42.7 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 11 November 2003 (DOY 315). 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 1.29 degrees C. Additional battery performance data for each battery on 24 October and 31 October 2003 are provided in Appendix D. The clock error ranged from -10.6 to 10.0 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 = 03 SUSIM = 00 SOLSTICE = 00 PEM = 05 HALOE = 01 HRDI = 00 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 02 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION One (1) operational support problem 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 Another preliminary delivery of the new Eclipse software release was installed on the prototype on 30 October 2003. This delivery contained fixes for the problems found in the previous preliminary build as well as the additional functionality to support DSN contacts. The DSN command functionality was tested with Canberra on 31 October 2003. Test commands were sent and received properly by the DSN station. The FOT is now satisfied in its ability to command through a DSN station using the Eclipse system. The telemetry portion of DSN capability will be tested in the upcoming weeks. The CMS software developer found the source of the problem with new CMS code. A change was made to a formula, which determines the size of the ephemeris file to be built. Initial tests showed positive results, but more analysis will be done early next week with the simulator. If the outcome is successful another release of the CMS software will be delivered containing this new fix. In parallel, the FOT is also working with the FSW group to review and test the new flight software uplink procedure. Testing has gone well so far and should be completed by the second week in November so that the end-to-end testing can begin. MEETINGS -None this report period FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 11 November 2003 (DOY 315). 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 31 October 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 66315 298/1220 03-281 PEM (Z/H) DAY ONLY TO FULLTIME OPS 66346 300/1400 03-282 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 66365 301/2005 03-283 PEM (Z/H) FULLTIME TO DAY-ONLY OPS 66366 301/2227 03-284 PEM AXIS AXIS-2 OFF 66377 302/1538 03-285 PEM (Z/H) DAY ONLY TO FULLTIME OPS 66379 302/1857 03-286 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 66390 303/1208 03-287 PEM (Z/H) TO DAY-ONLY OPS 66390 303/1310 03-288 HALOE POWER ON 66400 304/0429 03-289 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 31 October 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 31 October 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 66346 300/1400 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 66379 302/1857 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 66400 304/0429 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 31 October 2003 24 October 2003 - GMT Day 297 Beta = 67.3 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 -2.74/-4.31 +00.0/+00.0 07.2 0.000 0.0 2 +11.2/-22.4 +3.55/+1.97 +19.2/-15.2 26.7 1.050 15.7 3 +11.2/-33.6 +2.60/+1.34 +18.8/-14.8 26.7 1.050 15.4 31 October 2003 - GMT Day 304 Beta = 42.7 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/-4.63 +00.0/+00.0 07.2 0.000 0.0 2 +11.2/-50.4 +5.79/+4.50 +26.4/-15.2 24.6 1.050 20.5 3 +16.8/-67.2 +4.50/+3.23 +25.6/-15.2 24.5 1.040 20.0 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- None this report period APPENDIX E UARS ANOMALY REPORTS Week ending 31 October 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-050 FOT 66311 298/0712 30832 Generic Late Acquisition 03-050 FOT 66356 301/0703 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. 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 ------ ------ ----- ---- --- ----------------- 03-050 FOT See List Oct 03 30832 Generic Late Acquisition