******************************************************************** UARS WEEKLY STATUS REPORT - 27 JUN 2003 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM has successfully gathered all of its daily mid resolution, weekly offset, and O2 occultation scans this past week during periods of UARS telemetry or during 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 2001365 has been reprocessed and archived at the GSFC DAAC. HEPSA data files for 2002010 through 2002029 are awaiting archiving 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 14 June 2003 (Orbit 64308, GMT Day 165) through 20 June 2003 (Orbit 64411, GMT Day 171). 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 SOLSTICE 168/1342 64361 POWER ON TO FULLTIME SUSIM 168/1521 64362 POWER ON PART 1 PEM 169/1346 64376 POWER ON DAY ONLY HALOE 171/1251 64405 POWER ON PART 1 A Reverse-to-Forward Yaw Around maneuver (number 120) was successfully executed in Orbit 64317 beginning 165/16:14:06Z and completing at 165/16:51:16Z on 14 June 2003. All instruments were in their off or standby mode (except for SOLSTICE in day-only). Due to the SA position at 269 degrees, the effective night length of the spacecraft after the maneuver was approximately 55.71 minutes. Post maneuver analysis of data indicate that during the Yaw Around, the end-of-night load bus voltage was 25.60 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 21.09 and 20.62 percent respectively. The next (forward-to-reverse) YAW is scheduled for 26 July 2003 (DOY 207). The beta angle ranged between the angles of -04.5 degrees to 20.6 degrees for this report period. The beta angle is now increasing towards a maximum angle of 80 degrees on 06 July 2003 (DOY 187). 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 1.27 to 1.92 degrees C. Additional battery performance data for each battery on 13 June and 20 June 2003 are provided in Appendix D. The clock error ranged from -9.6 to 10.6 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 SOLSTICE = 01 SUSIM = 01 PEM = 01 HALOE = 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 02 Two (2) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Two (2) 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 Parallel operations with the new Eclipse Build 2.0.2 and the existing Eclipse Build 1.5.0 began on 19 June 2003, and will continue into next week. If the new Build runs error free during this time then it will be released for operations. The tentative date for the switch over is set for 25 June 2003. MEETINGS The FOT attended the weekly UARS DRB on 17 June 2003, to review the open DRs and discuss the testing status of the new Eclipse software delivery. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 26 July 2003 (DOY 207). 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 20 June 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 64346 167/1345 03-147 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 64346 167/1442 03-145 MPS VT LEVEL-6 TO LEVEL-5 64348 167/1703 03-145 MPS BATSOC 64361 168/1342 03-148 SOLSTICE POWER ON TO FULL TIME 64362 168/1521 03-149 SUSIM POWER ON PART 1 64364 168/1814 03-150 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 64376 169/1346 03-151 PEM POWER ON DAY ONLY 64376 169/1346 03-149 SUSIM POWER ON 64405 171/1251 03-152 HALOE POWER ON PART 1 64409 171/1810 03-153 HALOE POWER ON PART 2 APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 20 June 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 20 June 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 64346 167/1349 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 64364 168/1814 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 20 June 2003 13 June 2003 - GMT Day 164 Beta = 7.9 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 -700.0/-700.0 -3.68/-4.62 +00.0/-50.0 07.2 0.000 0.0 2 +11.2/-95.2 +5.47/+4.51 +26.4/-50.0 23.8 1.020 21.0 3 +22.4/-67.2 +4.51/+3.23 +25.6/-50.0 23.8 1.010 20.5 20 June 2003 - GMT Day 171 Beta = 20.6 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 -3.68/-4.94 +00.0/-00.0 07.2 0.000 0.0 2 +11.2/-39.2 +5.15/+3.23 +28.0/-14.8 24.8 1.020 18.9 3 +22.4/-44.8 +3.87/+2.60 +27.2/-14.4 24.8 1.010 18.6 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 64316 165/1502 LV5 -> LV6 64346 167/1442 LV6 -> LV5 APPENDIX E UARS ANOMALY REPORTS Week ending 20 June 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-027 FOT 64337 167/0007 30832 Generic Late Acquisition 03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K 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 ------ ------ ----- ---- --- ----------------- 03-027 FOT See List June 03 30832 Generic Late Acquisition 03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K