******************************************************************** UARS WEEKLY STATUS REPORT - 22 Nov 2002 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM was shut down for the yaw-around on November 16 and will resume solar scanning operations on November 22. *********** 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 1993129 has been reprocessed and is archived in the DAAC. HEPSA data for 1993074, 1993075, and between 1993130 and 1993169 have been reprocessed and waiting DAAC archival. 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 09 November 2002 (Orbit 61045, GMT Day 313) through 15 November 2002 (Orbit 61149, GMT Day 319). 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 SOLSTICE 317/1740 61116 POWER ON HALOE 317/1854 61117 POWER ON SUSIM 317/2038 61118 POWER ON SUSIM 319/2252 61149 POWER OFF SOLSTICE 319/2252 61149 FULLTIME TO DAY-ONLY OPS The beta angle ranged between the angles of 40.8 degrees to 16.0 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 19 November 2002 (DOY 323). 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 1.28 to 1.60 degrees C. Additional battery performance data for each battery on 08 November and 15 November 2002 are provided in Appendix D. The clock error ranged from -33.7 to 02.0 msec during this report period. The clock error of -33.7 was caused by a setting change made on the TAC to reflect the correct method of time tagging the data. 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 = 06 SOLSTICE = 02 HALOE = 01 SUSIM = 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Four (4) 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 13 November 2002, the FOT was re-initializing the UFLTR Processor to reduce attitude biases. When sending a partial table load to set the Mode 3 initialization flag, a non-nominal roll error was seen. It turns out that the BASETAB used to set this flag also selects Earth Sensor-3. In this mode the spacecraft uses pitch information from Earth Sensor-2 and takes roll data from Earth Sensor-1, which was off at the time. The last stale value in the Earth Senor-1 was 5 degree's. This caused the spacecraft to chase a 5-degree roll error that didn't exist, which in turn caused a negative acquisition on the subsequent pass. An omni pass was immediately scheduled, the proper earth sensor selection was made (which corrected the attitude errors) and all of the instruments were powered off due to insufficient power. After which the UFLTR reinitialization took place successfully, followed by instrument turn ons for SOLSTICE, HALOE, SUSIM and HRDI. The reinitialization has shown lower residuals in the FSS and quieter gyro biases, but there is still a minor roll error which is induced during each orbit. The FOT is unsure of its cause as of yet and is in the process of investigating this behavior. It may take several days to determine what is causing this disturbance. MEETINGS None this report period. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 18 November 2002 (DOY 322). 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 15 November 2002 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 61088 315/1709 02-435 OBC BANK DUMPS 61113 317/1341 02-436 UFLTR UFLTR RE-INITIALIZATION 61116 317/1706 02-436 UFLTR UFLTR RE-INITIALIZATION 61116 317/1740 02-436 UFLTR UFLTR RE-INITIALIZATION - CLEANUP 61116 317/1740 02-437 SOLSTICE POWER ON 61117 317/1854 02-438 HALOE POWER ON 61117 317/1854 02-436 UFLTR UFLTR RE-INITIALIZATION - COMPLETED 61118 317/2038 02-439 SUSIM POWER ON 61118 317/2113 02-439 SUSIM POWER ON CONTIUNED 61119 317/2256 02-440 ACS GYRO BIAS RESET 61121 318/0220 02-440 ACS GYRO BIAS RESET 61125 318/0833 02-440 ACS GYRO BIAS RESET 61134 318/2218 02-440 ACS GYRO BIAS RESET 61145 319/1556 02-443 OBC/CLK CLK ADJ FR 0.0 TO -41.2 MSEC/DAY 61145 319/1556 02-444 MACS ESA-2 OFF 61148 319/2035 02-445 MACS GYRO BIAS NOISE UPDATE 61148 319/2110 02-440 MACS GYRO BIAS RESET 61149 319/2252 02-446 SUSIM POWER OFF 61149 319/2252/ 02-447 SOLSTICE FULLTIME TO DAY-ONLY OPS APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 15 November 2002 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 15 November 2002 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 60973 308/0605 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 61003 310/0602 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY 61028 311/2131 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 15 November 2002 08 November 2002 - GMT Day 312 Beta = 44.6 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 -151.2/-179.2 -3.05/-4.62 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-44.8 +5.47/+4.51 +27.2/-15.2 24.8 1.040 20.5 3 +22.4/-22.4 +4.51/+3.23 +26.4/-15.2 24.8 1.030 20.2 15 November 2002 - GMT Day 319 Beta = 16.0 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 -156.8/-179.2 -3.36/-4.62 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-56.0 +5.79/+4.51 +24.8/-12.8 25.1 1.040 21.1 3 +22.4/-56.0 +4.83/+3.23 +23.6/-12.0 25.1 1.040 20.5 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- - None this report period APPENDIX E UARS ANOMALY REPORTS Week ending 15 November 2002 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-057 FOT 61108 317/0544 31741 GENERIC LATE ACQUISITION 02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR 02-057 FOT 61113 317/1739 31741 GENERIC LATE ACQUISITION ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-053 FOT 60630 285/1008 30382 GENERIC LATE ACQUISITION ANOMALY INVESTIGATION REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-056 FOT 60775 295/0122 N/A OBC CRASH 02-057 FOT 61108 317/0544 31741 GENERIC LATE ACQUISITION 02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR 02-057 FOT 61113 317/1739 31741 GENERIC LATE ACQUISITION