******************************************************************** UARS WEEKLY STATUS REPORT - 01 AUG 2003 ******************************************************************** *********** SOLSTICE *********** For four days this week (205-209), SOLSTICE was powered only during daylight to support the yaw maneuver. Otherwise, solar data were collected on all available orbital tracking periods. In general, we get about 50% of the day's data returned from the spacecraft. This amounts to about 450 minutes of solar data per day nominally and about 250 minutes per day during daytime only ops. *********** SUSIM *********** SUSIM took no data for 25-28 of July because of the power restrictions during the yaw-around. Otherwise, the instrument successfully gathered all of its daily mid 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 2002099 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 19 July 2003 (Orbit 64833, GMT Day 200) through 25 July 2003 (Orbit 64938, GMT Day 206). 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 203/0823 64884 POWER OFF SOLSTICE 205/2017 64921 POWER OFF PEM 205/2052 64922 POWER OFF SUSIM 205/2052 64922 POWER OFF The beta angle ranged between the angles of 29.8 degrees to 06.3 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 26 July 2003 (DOY 207). 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 0.95 to 1.28 degrees C. Additional battery performance data for each battery on 18 July and 25 July 2003 are provided in Appendix D. The clock error ranged from -09.7 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 = 04 HALOE = 01 SOLSTICE = 01 PEM = 01 SUSIM = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Three (3) Anomaly Report remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Three (3) 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 On the 203/1726-1755 TDRS East event the UARS POCC failed to acquire data and WSC showed no RF. This was caused by an operator error of failing to uplink the days stored command load. Without the new load the stored command processor onboard halted. This caused the negative acquisition on the subsequent pass because the HGA slew commands were not sent out of the stored command area of memory. On the following 203/1836-1902 pass the stored command load was uplinked and the pointer was jumped to the proper location. The only impact to operations was a loss of a single sun track, which was approximately 12.5 minutes in duration (203/18:49:24-19:02:00). This error occurred by not following standard operating procedure, and the FOT has been reminded of the importance of strict adherence to this procedure. MEETINGS The FOT attended the UARS/ERBS DR meeting to discuss the status of open DRs and future plans. It was decided at this meeting that this meeting will become a biweekly meeting, due to the lack of high severity DRs The FOT also attended an informal review of the operator error on 24 July 2003. 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 25 July 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 64884 203/0823 03-187 HALOE POWER OFF (YAW) LOW POWER 64889 203/1649 03-188 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 64890 203/1836 03-189 OBC ATC JUMP LOCATION 508 64891 203/1911 03-190 OBC ATC NOOPS 64907 204/2200 03-191 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 64921 205/2017 03-192 SOLSTICE FULLTIME TO DAY ONLY 64922 205/2052 03-193 PEM POWER OFF 64922 205/2052 03-194 SUSIM POWER OFF APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 25 July 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 July 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 64884 203/0823 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 64907 204/2200 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 25 July 2003 18 July 2003 - GMT Day 199 Beta = 34.1 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 -700.0/-700.0 -3.05/-4.31 +00.0/-00.0 07.2 0.000 0.0 2 +11.2/-112.0 +5.15/+3.87 +27.2/-16.0 24.2 1.030 19.8 3 +22.4/-44.8 +3.87/+2.92 +26.8/-16.0 24.2 1.020 19.5 25 July 2003 - GMT Day 206 Beta = 06.3 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 -3.68/-4.94 +00.0/-00.0 07.2 0.000 0.0 2 +11.2/-134.4 +4.83/+3.55 +27.2/-12.8 24.5 1.000 19.7 3 +22.4/-44.8 +3.55/+2.60 +26.4/-12.8 24.5 1.000 19.2 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 25 July 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-035 FOT 64889 203/1726 N/A ATC HALT 03-031 FOT 64913 205/0634 30832 Generic Late Acquisition 03-036 FOT 64935 206/1831 N/A Lost Lock - White S. Maint. ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-034 FOT 64804 198/0139 N/A SSPP IN WRONG OPSTATE 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 ------ ------ ----- ---- --- ----------------- 03-031 FOT See List July 03 30832 Generic Late Acquisition 03-035 FOT 64889 203/1726 N/A ATC HALT 03-036 FOT 64935 206/1831 N/A Lost Lock - White S. Maint.