******************************************************************** UARS WEEKLY STATUS REPORT - 17 Jan 2003 ******************************************************************** *********** SOLSTICE *********** During this week, SOLSTICE continued to operate in good health gathering solar data on all available orbital tracking periods. *********** SUSIM *********** SUSIM successfully gathered all of its daily 1.1 nm (mid) resolution and MgII solar scans this past week during periods of predicted UARS telemetry. For Tuesday, Jan. 21, we have planned a series of molecular oxygen occultation scans at 141, 160, and 170 nm, the first of these done since 1999. *********** 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 1994365 has been reprocessed. PEM HEPSA data from 1995001 through 1995069 is waiting for DAAC archive. 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 04 January 2003 (Orbit 61887, GMT Day 004) through 10 January 2003 (Orbit 61991, GMT Day 010). 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 HRDI 004/0223 61888 DAY-ONLY OPS HRDI 007/0153 61933 FULLTIME OPS The beta angle ranged between the angles of 69.6 degrees to 76.7 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 27 January 2003 (DOY 027). 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 1.26 to 1.64 degrees C. Additional battery performance data for each battery on 03 January and 10 January 2003 are provided in Appendix D. The clock error ranged from -10.3 to 10.4 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 HRDI = 02 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 02 Three (3) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Two (2) 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 The FOT is still finishing up some clean up activities from the OBC Halt anomaly. These activities include editing the clock correlation procedure and rewriting some safehold recovery procedures. The FOT has also added the MODE3I flag change needed in the UFLTR reinitialization procedure. MEETINGS The FOT attended an FDF product meeting on 06 January 2003. The purpose of this meeting was to discuss eliminated or reducing the frequency of the FDF products delivered to UARS/ERBS/TOMS. The Monthly Status Review was held on 07 January 2003 in order to review the activities for UARS last month and future plans. FUTURE SIGNIFICANT EVENTS The students will be returning to the control center starting 13 January 2003. The next UARS Yaw slew is scheduled for 27 January 2003 (DOY 027). 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 10 January 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 61888 004/0223 03-001 HRDI TO DAY-ONLY OPS 61901 004/2221 03-002 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY 61917 006/0036 03-003 PEM AXIS POWER OFF 61928 006/1855 03-004 SADDE SADDE SAFEHOLD OFF 61933 007/0153 03-005 HRDI TO FULLTIME 61936 007/0734 03-006 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 61963 009/0149 03-007 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 10 January 2003 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 10 January 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 61901 004/2224 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY 61936 007/0753 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY 61963 009/0154 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 10 January 2003 03 January 2003 - GMT Day 003 Beta = 67.9 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 -3.05/-4.63 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-22.4 +3.87/+2.60 +20.4/-15.2 26.4 1.040 16.9 3 +16.8/-22.4 +2.91/+1.65 +19.6/-15.2 26.4 1.040 16.7 10 January 2003 - GMT Day 010 Beta = 76.7 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 -162.4/-179.2 -2.11/-3.68 +00.0/+00.0 08.3 0.000 0.0 2 -05.6/-33.6 +2.91/+1.65 +16.0/-15.2 27.0 1.100 12.9 3 +11.2/-22.4 +2.28/+1.34 +15.6/-14.4 27.0 1.090 12.6 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 10 January 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-002 FOT 61930 003/2118 30832 Generic Late Acquisition 03-003 FOT 61935 007/0515 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR 02-059 FOT 61797 363/0021 30832 Generic Late Acquisition ANOMALY INVESTIGATION REPORTS GENERATED AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout 03-002 FOT 61930 003/2118 30832 Generic Late Acquisition 03-003 FOT 61935 007/0515 30832 Generic Late Acquisition