******************************************************************** UARS WEEKLY STATUS REPORT - 11 June 2004 ******************************************************************** *********** SOLSTICE *********** This week, SOLSTICE continued to operate in good health gathering solar data on all available orbital tracking periods. On average, we received 57% of each day's data amounting to about 527 minutes of solar observing time per day. *********** SUSIM *********** SUSIM was turned off on June 3 to conserve power during the low beta period surround the yaw-around. After the turn on June 9, the experiment successfully gathered its 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 *********** 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 2000039. MEPS data files between 2000040 and 2000079 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 29 May 2004 (Orbit 69570, GMT Day 150) through 4 June 2004 (Orbit 69675, GMT Day 156). 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 153/2128 69629 POWER OFF PEM 155/2023 69658 ZEPS/HEPS OFF SUSIM 155/2124 69659 POWER OFF SOLSTICE 155/2202 69659 FULLTIME TO DAY-ONLY OPS The beta angle ranged between the angles of 28.6 degrees to 8.7 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 06 June 2004 (DOY 158). 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 0.64 to 0.95 degrees C. Additional battery performance data for each battery on 28 May and 04 June 2004 are provided in Appendix D. The clock error ranged from 10.1 to -10.3 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 = 03 HALOE = 01 PEM = 01 SUSIM = 01 SOLSTICE = 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 attempted to recreate the yaw wheel anomaly on the simulator this week. Unfortunately, there were some problems getting the UTTS scenario to work properly, so this work will continue next week. A few days before the previous yaw maneuver high differential values were seen on Battery 2, but no indication of that has been seen prior to the yaw maneuver. The FOT will keep a close eye on the differential voltage after the yaw. MEETINGS The FOT attended the UARS Monthly Status meeting to discuss the significant events for the month of May. 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 04 June 2004 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 69620 153/0750 04-154 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 69629 153/2128 04-155 HALOE POWER OFF 69639 154/1307 04-156 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 69642 154/1803 04-157 OBC SOFTWARE BANK DUMPS 69658 155/2023 04-158 PEM ZEPS/HEPS OFF 69659 155/2124 04-159 SUSIM POWER OFF 69659 155/2202 04-160 SOSLSTICE FULLTIME TO DAY-ONLY OPS APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 04 June 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 04 June 2004 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 69620 153/0750 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 69639 154/1330 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 04 June 2004 28 May 2004 - GMT Day 149 Beta = 30.1 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 +44.8/-16.8 +6.44/+5.15 +27.2/-13.6 23.8 1.03 20.6 3 +67.2/-22.4 +5.15/+4.19 +26.4/-13.6 23.7 1.02 20.3 04 June 2004 - GMT Day 156 Beta = 08.7 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 -700.0/-700.0 -3.36/-4.94 +00.0/+00.0 07.0 0.00 0.0 2 +22.4/-33.6 +4.51/+3.87 +27.2/-12.8 25.4 1.01 19.9 3 +22.4/-33.6 +3.55/+2.60 +26.4/-12.8 25.4 1.00 19.5 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 04 June 2004 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-031 FOT 69662 156/0159 36027 TDRSS WEST OUTAGE ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 04-024 FOT See List May 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 ------ ------ ----- ---- --- ----------------- 04-031 FOT 69662 156/0159 36027 TDRSS WEST OUTAGE