******************************************************************** UARS WEEKLY STATUS REPORT - 14 MAY 2004 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM was turned off for May 6-13. *********** PEM *********** 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 2003365 has been reprocessed and archived at the GSFC DAAC. Level 2 PEM MEPS data file documentation is complete and submitted to the DAAC. MEPS data files are version 1. Processed MEPS data files at the DAAC archive are between 1991274 and 1999039. MEPS data files between 1999040 and 1999079 are waiting for DAAC collection. 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. 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 *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 01 May 2004 (Orbit 69150, GMT Day 122) through 07 May 2004 (Orbit 69254, GMT Day 128). 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 HALOE 123/2246 69179 POWER OFF PEM 125/2202 69208 ZEPS/NEPS OFF PEM 125/2202 69208 AXIS 1 & 2 OFF SOLSTICE 126/2238 69224 SOLSTICE TO DAY ONLY SUSIM 126/2238 69224 POWER OFF A Forward-to-Reverse Yaw Around maneuver (number 129) was successfully executed in Orbit 69249 beginning 128/14:51:39Z and completing at 128/15:28:49Z on 07 May 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 57.89 minutes. Post maneuver analysis of data indicate that during the Yaw Around, the end-of-night load bus voltage was 24.96 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 21.55 and 21.32 percent respectively. The next (reverse-to-forward) YAW is scheduled for 06 June 2004 (DOY 158). The beta angle ranged between the angles of 24.1 degrees to 01.2 degrees for this report period. The beta angle is now increasing towards a maximum angle of 36 degrees on 22 May 2004 (DOY 143). 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 30 April and 07 May 2004 are provided in Appendix D. The clock error ranged from 10.5 to -12.5 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 PEM = 02 SOLSTICE = 01 SUSIM = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 01 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 The FOT began taking SSA only events on TDW on 23 April 2004. This change to operations was needed due to the TDRS-8 move to TDW. Since the SSA service is in higher demand than the MA service, the FOT receives approximately 50% of the events requested. This effectively yields the realtime support of 2.5 TDRS instead of 3 TDRS. The FOT will continue to operate in this mode until the software fix to the CMS is made to ingest the SMA view periods correctly. Preliminary estimates project this fix to be released to operations no sooner than two months from now. MEETINGS The FOT attended the UARS Monthly Status Review on 03 May 2004 to review the significant events for March and April. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 06 June 2004 (DOY 158). 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 07 May 2004 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 69160 122/1634 04-127 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 69179 123/2246 04-128 HALOE POWER OFF 69181 124/0209 04-129 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 69208 125/2202 04-130 PEM ZEPS/NEPS OFF 69208 125/2202 04-131 PEM AXIS 1 & 2 OFF 69224 126/2238 04-132 SOLSTICE SOLSTICE TO DAY ONLY 69224 126/2238 04-133 SUSIM POWER OFF 69234 127/1438 04-134 MPS VT LEVEL 6 (YAW) 69241 128/0236 04-135 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 69248 128/1355 04-134 OBC/TAM YAW MANEUVER COMMANDS 69249 128/1525 04-134 OBC YAW MANUEVER 69249 128/1550 04-134 OBC/TAM YAW MANEUVER COMMANDS APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 07 May 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 07 May 2004 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 69160 122/1636 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 69181 124/0209 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 69241 128/0236 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 07 May 2004 30 April 2004 - GMT Day 121 Beta = 26.5 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/-4.63 +00.0/+00.0 07.0 0.00 0.0 2 +00.0/-179.2 +5.46/+4.50 +28.4/-14.0 24.6 1.04 20.4 3 +22.4/-134.4 +4.50/+3.55 +27.6/-14.4 24.6 1.03 20.2 07 May 2004 - GMT Day 128 Beta = 01.2 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/-4.63 +00.0/+00.0 07.0 0.00 0.0 2 +00.0/-184.8 +5.79/+4.50 +27.2/-13.6 25.0 1.00 21.6 3 +22.4/-072.8 +4.50/+3.23 +26.8/-14.4 25.0 1.00 21.3 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 69234 127/1438 LV5 -> LV6 APPENDIX E UARS ANOMALY REPORTS Week ending 07 May 2004 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-024 FOT 69223 126/2132 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-019 FOT See List Apr 04 30832 Generic Late Acquisition 04-021 FOT 69060 116/0050 30824 Telemetry Dropouts 04-022 FOT 69132 120/2000 35744 Negative Acquisition 04-023 FOT 69134 120/2331 35746 Data Drop Out 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 ------ ------ ----- ---- --- ----------------- 04-024 FOT See List May 04 30832 Generic Late Acquisition