******************************************************************** UARS WEEKLY STATUS REPORT - 27 Aug 2004 ******************************************************************** *********** SOLSTICE *********** SOLSTICE resumed normal operations this week after operating only during daylight in support of the yaw maneuever. Otherwise, SOLSTICE continued to operate in good health gathering solar data on all available orbital tracking periods. On average, we received 54% of each day's data amounting to about 358 minutes of solar observing time per day. *********** SUSIM *********** SUSIM was turned on after the yaw-around on August 20. Since then, the experiment 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 2004079 has been reprocessed and archived at the GSFC DAAC. Currently, HEPSA data between 2004080 and 2004089 has been processed waiting for archival at the GSFC DAAC. MEPS data files are version 1. Processed MEPS data files at the DAAC archive are between 1991274 and 2004069. Currently, MEPS data between 2004070 and 2004079 has been processed waiting for archival at the GSFC DAAC. 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 14 August 2004 (Orbit 70729, GMT Day 227) through 21 August 2004 (Orbit 70834, GMT Day 233). 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 PEM 228/1945 70756 POWER OFF SOLSTICE 228/2208 70757 FROM FULL TO DAY ONLY SUSIM 228/2320 70758 POWER OFF A Reverse-to-Forward Yaw Around maneuver (number 132) was successfully executed in Orbit 70798 beginning 231/ 16:48:26Z and completing at 231/ 17:25:36Z on 18 August 2004. 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 25.76 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 20.74 and 20.16 percent respectively. The next (forward-to-reverse) YAW is scheduled for 25 September 2004 (DOY 269). The beta angle ranged between the angles of 14.9 degrees to 07.5 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 0.95 to 0.96 degrees C. Additional battery performance data for each battery on 13 August and 20 August 2004 are provided in Appendix D. The clock error ranged from 10.6 to -09.9 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 = 05 PEM = 01 SOLSTICE = 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 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 remains in VT-6 and will be monitored closely to determine when to go back to VT-5. The new CMS code to allow for SMA events continued to undergo testing this week. Problems receiving products from FDF, transferring the schedule from UPS to CMS, and system drive issues hindered progress. While the FDF product and system drive issues have been resolved, the transfer issue is still under investigation. MEETINGS -None this report period 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 20 August 2004 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 70731 227/0329 04-232 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 70750 228/0951 04-233 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 70756 228/1945 04-234 PEM POWER OFF 70757 228/2208 04-235 SOLSTICE SOL FROM FULL TO DAY ONLY 70758 228/2320 04-236 SUSIM POWER OFF 70798 231/1515 04-237 ACS YAW MANEUVER 70806 232/0400 04-238 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 70826 233/1056 04-239 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 20 August 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 20 August 2004 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 70731 227/0332 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 70750 228/0956 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 70806 232/0406 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 70826 233/1056 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 20 August 2004 13 August 2004 - GMT Day 226 Beta = 16.5 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 -700.0/-700.0 -3.05/-3.68 +00.0/+00.0 07.0 0.00 0.0 2 -00.0/-22.4 +5.79/+5.47 +24.8/-12.0 26.7 1.02 20.5 3 +22.4/-00.0 +4.83/+4.19 +24.0/-12.0 26.7 1.02 20.0 20 August 2004 - GMT Day 233 Beta = 07.5 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 -700.0/-700.0 -3.05/-4.62 +00.0/+00.0 07.0 0.00 0.0 2 +11.2/-044.8 +5.15/+4.19 +27.2/-12.0 26.4 1.04 18.8 3 +00.0/-112.0 +3.87/+2.92 +25.6/-12.0 26.4 1.05 18.2 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 20 August 2004 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-057 FOT 70751 228/1124 36677 Drop out on the Return 04-050 FOT 70755 228/1804 30832 Generic Late Acquisition 04-058 FOT 70774 230/0059 36694 7:01 Data loss: weather@WSGT ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-053 FOT 70674 223/0845 36597 No Acquisition GDIS Prob at WS 04-054 FOT 70708 225/1549 36643 Bad Weather conditions @ Guam 04-055 FOT 70711 224/2037 36648 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 ------ ------ ----- ---- --- ----------------- 04-050 FOT See List August 04 30832 Generic Late Acquisition 04-057 FOT 70751 228/1124 36677 Drop out on the Return 04-058 FOT 70774 230/0059 36694 7:01 Data loss: weather@WSGT