******************************************************************** UARS WEEKLY STATUS REPORT - 31 January 2003 ******************************************************************** *********** SOLSTICE *********** In support of the yaw maneuver this week, SOLSTICE was in day only operations, taking the default solar observations. Otherwise, SOLSTICE continues to operate normally, taking solar data on all available orbital tracking periods. The SORCE satellite was launched on Saturday January 25th taking with it the next generation SOLSTICE instrument. We look forward to analyzing this overlap data and continuing these long term solar measurements. *********** SUSIM *********** SUSIM was turned off January 26-29; scans were missed for January 27-29. Otherwise, SUSIM successfully gathered all of its daily 1.1 nm (mid) resolution MgII, and pointing offset solar scans during periods of predicted UARS telemetry. Another set of sunrise occultation scans have been scheduled for next week. *********** 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 1996220 has been reprocessed and archived at the GSFC DAAC. HEPSA data between 1996221 and 1996366 is waiting to be 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 18 January 2003 (Orbit 62097, GMT Day 018) through 24 January 2003 (Orbit 62202, GMT Day 024). 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 021/2158 62156 AXIS Power OFF The beta angle ranged between the angles of 43.3 degrees to 14.0 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 1.27 to 1.29 degrees C. Additional battery performance data for each battery on 17 January and 24 January 2003 are provided in Appendix D. The clock error ranged from -11.0 to 10.1 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 PEM = 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 a 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. MEETINGS -None this report period 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 24 January 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 62113 019/0204 03-014 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 62130 020/0624 03-015 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 62153 021/1641 03-016 SUSIM TIMING COMMANDS 62156 021/2158 03-017 PEM AXIS POWER OFF 62169 022/1824 03-018 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 62186 023/2228 03-019 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 24 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 24 January 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 62113 019/0209 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 62130 020/0628 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 62169 022/1825 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 62186 023/2230 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 24 January 2003 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 24 January 2003 - GMT Day 024 Beta = 14.0 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 -3.36/-4.94 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-56.0 +5.79/+4.50 +32.1/-14.4 25.3 1.030 21.5 3 +33.6/-22.4 +4.50/+3.23 +28.8/-14.4 25.1 1.020 21.0 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 24 January 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-002 FOT 62102 018/0814 32101 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-002 FOT 62035 013/2022 32101 18 sec data dropout 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 62102 018/0814 32101 Generic Late Acquisition