******************************************************************** UARS WEEKLY STATUS REPORT - 02 AUG 2002 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** Nothing received. *********** ACRIM *********** Nothing received. *********** PEM *********** 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 this conjunction period show spatial regions that both GUVI and PEM sampled when aurora was present. Separation is several minutes to 10's of minutes. PEM data from the second GUVI-PEM conjunction is now being processed. 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 to support re-engineering of the UARS Mission Operations Concept to develop capabilities for the Science Traceability Mission. Daily processing of instrument Daily Activity Plans continues with no problems. *********** CDHF *********** *********** FOT *********** REPORTING PERIOD This report covers 20 July 2002 (Orbit 59362, GMT Day 201) through 26 July 2002 (Orbit 59467, GMT Day 207). 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 WINDII 202/0056 59375 POWER OFF HALOE 202/1335 59385 POWER ON The beta angle ranged between the angles of 53.9 degrees to 28.1 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 02 August 2002 (DOY 214). 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 1.29 to 1.34 degrees C. Additional battery performance data for each battery on 19 July and 26 July 2002 are provided in Appendix D. The clock error ranged from 11.4 to 10.2 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 WINDII = 01 HALOE = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 01 Two (2) Anomaly Report remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION One (1) 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 finished testing the Eclipse software patch to fix erroneous alarm messages. It is now installed on the realtime system and has been working successfully since installation. The Raytheon development team has also solved the problem seen on the status buffer display and will deliver a new database this week for testing. MEETINGS -None this report period FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 02 August 2002 (DOY 214). This maneuver will be a Forward to Reverse Flight maneuver (Northern 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 26 July 2002 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 59375 201/2200 02-254 WINDII POWER OFF 59377 202/0056 02-255 OBC/CLK CLK ADJ FR 0.00 TO 20.6 MSEC/DAY 59385 202/1335 02-256 HALOE POWER ON 59397 203/0817 02-257 OBC ATC NOOP;XMTR-ON CMD 59400 203/1334 02-258 OBC/CLK CLK ADJ FR 20.6 TO 0.00 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 26 July 2002 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 26 July 2002 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 59377 202/0103 CLK ADJ FR 0.00 TO 20.6 MSEC/DAY 59400 203/1339 CLK ADJ FR 20.6 TO 0.00 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 26 July 2002 19 July 2002 - GMT Day 200 Beta = 58.1 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 -157.0/-123.7 -3.30/-4.52 +00.0/+00.0 8.4 0.000 0.0 2 + 11.2/- 67.2 +3.87/+2.60 +20.8/-13.5 25.8 1.030 17.7 3 + 22.4/- 33.6 +2.92/+1.97 +20.3/-13.4 25.6 1.020 17.3 26 July 2002 - GMT Day 207 Beta = 28.1 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 -157.0/-168.0 -3.30/-4.24 +00.0/+00.0 08.5 0.000 0.0 2 + 11.2/- 69.6 +6.44/+5.15 +27.5/-17.9 27.8 1.030 21.8 3 + 22.4/- 56.0 +5.21/+3.87 +26.7/-17.6 27.7 1.020 21.4 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period APPENDIX E UARS ANOMALY REPORTS Week ending 26 July 2002 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-039 FOT 59368 201/1002 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 AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-039 FOT See List July 30832 Generic Late Acquisition 02-041 FOT 59279 195/1156 N/A TMON 01 tripped