******************************************************************** UARS WEEKLY STATUS REPORT - 10 SEP 2004 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM successfully gathered daily mid (1.1 nm) resolution, MgII, occultation, solar pointing offset, and continuous monitoring scans for periods of UARS real-time telemetry or onboard tape recording. *********** PEM *********** HEPSA data files are version 2. Currently, HEPSA data between 1991274 and 2004099 has been reprocessed and archived at the GSFC DAAC. MEPS data files are version 1. Processed MEPS data files at the DAAC archive are between 1991274 and 2004099. PEM continues to receive NMC data files from NOAA. No problems have been encountered. The PEM data from the GUVI conjunction periods may be found at http://wwwpem.space.swri.edu/guvi-pem.html. The additional electron data for the October and November storms of 2003 has been moved and is now located at http://climatology.space.swri.edu/uars_fromRudy.html. For those users of SDDAS, update your UARS Meta data and these data times will appear with full functionality. Proton data from these storms are now located at http://climatology.space.swri.edu/UARS_images_from_Rudy_(Apr._2004).html Requests have been received for storm spectral data. Overview plots were produced and these plots may be found on the web at http://climatology.space.swri.edu/UARS_images_postedJune2004.html for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000, March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and November 11-12 of 2001. *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. *********** 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 28 August 2004 (Orbit 70939, GMT Day 241) through 03 September 2004 (Orbit 71044, GMT Day 247). 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 245/1018 71006 POWER OFF The beta angle ranged between the angles of 38.6 degrees to 58.6 degrees for this report period. The beta angle is now increasing towards a maximum angle of 63 degrees on 06 September 2004 (DOY 250). 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 1.58 degrees C. Additional battery performance data for each battery on 27 August and 03 September 2004 are provided in Appendix D. The clock error ranged from 10.3 to -11.3 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 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 00 One (1) Anomaly Report remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION One (1) operational support problem 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 10 August 2004, during the 223/0121 Z event, VT-6 was commanded due to the differential voltage being greater than 180 mV for three consecutive orbits. The differential voltage returned to nominal values after two orbits subsequent to the change. The spacecraft remained in VT-6 until approximately 245/1600, at which time it was commanded back to VT-5. All trending of the power subsystem during this time looks nominal and the FOT will continue to use VT-6 should the differential climb again. A new release of the CMS code to allow for SMA events was delivered to the backup CMS this week. This new release was built to fix the file transfer problem encountered in the previous build. The preliminary testing showed the file transfer issue to be resolved, but the build still requires all other process testing. The goal for completion is the end of September. MEETINGS The FOT attended a meeting with Paul Ondrus on Wednesday September 01, 2004 at 11AM. The meeting was in reference to the HRDI attitude error that FDF is working on and the current status of the differential voltage issue. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 25 September 2004 (DOY 269). 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 03 September 2004 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 70991 244/1103 04-246 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 71006 245/1018 04-247 HALOE POWER OFF (HI TBAT TEMP) 71008 245/1418 04-248 MPS VT L6 TO VT L5 71011 245/1858 04-248 MPS BATSOC SENT 71016 246/0216 04-249 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 71024 246/1554 04-250 OBC/CLK ZERO EXEC STATUS REPORT APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 03 September 2004 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 03 September 2004 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 70991 244/1120 CLK ADJ FR 0.0 to 20.6 MSEC/DAY 71016 246/0219 CLK ADJ FR 20.6 to 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 03 September 2004 27 August 2004 - GMT Day 240 Beta = 35.1 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 -2.73/-3.99 +00.0/+00.0 07.0 0.00 0.0 2 +11.2/-050.4 +5.79/+4.83 +26.8/-14.4 26.4 1.02 19.7 3 +00.0/-100.8 +4.51/+3.87 +25.6/-14.0 26.4 1.02 19.1 03 September 2004 - GMT Day 247 Beta = 58.6 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 -3.05/-4.62 +00.0/+00.0 07.0 0.00 0.0 2 +22.4/-044.8 +3.87/+2.29 +20.8/-13.6 26.4 1.04 16.3 3 +11.2/-044.8 +3.23/+1.66 +20.8/-14.4 26.4 1.03 16.3 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 71008 245/1418 L6 -> L5 APPENDIX E UARS ANOMALY REPORTS Week ending 03 September 2004 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-059 FOT 71015 246/0136 N/A OBC/CLK adj cmd problem ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-050 FOT See List August 04 30832 Generic Late Acquisition 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 ------ ------ ----- ---- --- ----------------- 04-059 FOT 71015 246/0136 N/A OBC/CLK adj cmd problem