******************************************************************** UARS WEEKLY STATUS REPORT - 24 Jan 2003 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, taking solar data on all available orbital tracking periods. *********** SUSIM *********** This past week, SUSIM successfully gathered all of its daily 1.1 nm (mid) resolution MgII, and pointing offset solar scans during periods of predicted UARS telemetry. The occultation scans of Tuesday, Jan. 21, were only partially successful; we will try them again soon. *********** 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 1995365 has been reprocessed. 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 11 January 2003 (Orbit 61992, GMT Day 011) through 17 January 2003 (Orbit 62096, GMT Day 017). 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 012/1339 62015 POWER ON - AXIS 1 & 2 WINDII 015/2242 62066 POWER OFF HALOE 016/1148 62074 POWER ON The beta angle ranged between the angles of 70.2 degrees to 44.5 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 27 January 2003 (DOY 027). 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 1.57 to 1.90 degrees C. Additional battery performance data for each battery on 10 January and 17 January 2003 are provided in Appendix D. The clock error ranged from -10.0 to 07.6 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 = 02 PEM = 01 WINDII = 01 HALOE = 01 SUSIM = 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 is awaiting an new build of the Eclipse ground software, which is slated to arrive early next week. This build should correct several DR issues, most importantly the wait statement problem seen in the execution of some CECIL procedures. FOT testing of this build will begin once the delivery is installed on the UARS prototype system. The FOT also welcomed back the Education Outreach students on 13 January 2003. The students have begun their second semester of training and will be divided among ERBS/UARS/TOMS after their evaluation on 07 February 2003. MEETINGS The FOT attended TDRS naming convention meeting on 14 January 2003 to discuss the impacts of the new longitudinal names of TDRS East and West. The FOT also attended a weekly meeting at Capitol College on 17 January 2003 for the SOI Students to discuss openly any questions they may have encountered in their studies. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 27 January 2003 (DOY 027). 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 17 January 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 61997 011/0907 03-008 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 62015 012/1339 03-009 PEM POWER ON - AXIS 1 & 2 62016 012/1432 03-009 PEM POWER ON - AXIS 1 & 2 (COMPLETED) 62065 015/2053 03-010 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 62066 015/2242 03-011 WINDII POWER OFF 62074 016/1148 03-012 HALOE POWER ON 62093 017/1731 03-013 SUSIM TIMING COMMANDS APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 17 January 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 17 January 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 61997 011/0908 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 62065 015/2055 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 17 January 2003 10 January 2003 - GMT Day 010 Beta = 76.7 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 -162.4/-179.2 -2.11/-3.68 +00.0/+00.0 08.3 0.000 0.0 2 -05.6/-33.6 +2.91/+1.65 +16.0/-15.2 27.0 1.100 12.9 3 +11.2/-22.4 +2.28/+1.34 +15.6/-14.4 27.0 1.090 12.6 17 January 2003 - GMT Day 017 Beta = 44.5 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 -162.4/-184.8 -3.68/-4.63 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-22.4 +5.46/+3.87 +26.4/-15.2 25.4 1.050 19.8 3 +33.6/-22.4 +4.50/+2.60 +25.6/-14.8 25.4 1.040 19.3 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 17 January 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-002 FOT 62035 013/2022 32101 18 sec data dropout 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 ------ ------ ----- ---- --- ----------------- 02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout 03-002 FOT 62035 013/2022 32101 18 sec data dropout