******************************************************************** UARS WEEKLY STATUS REPORT - 27 SEP 2002 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, taking solar data on all available orbital tracking periods. *********** SUSIM *********** On September 24 and 25, the UARS did not receive all of the telemetry contacts that the UARS team had requested. Consequently, a large part of the daily mid resolution scans on those days were lost due to lack of TDRSS telemetry. This can be seen by going to the SUSIM homepage and clicking on "Plots of Recent Days' Solar and Lamp Scans". Also, the proposed telemetry contacts for September 30 and October 1 do not contain enough telemetry time during S/C day to gather 1.1 nm scans over the entire 115-410 nm wavelength interval. Otherwise, SUSIM successfully performed its daily mid-resolution and MgII solar scans during this past week for periods of predicted UARS telemetry. *********** ACRIM *********** Nothing received. *********** PEM *********** Nothing received. *********** HALOE *********** HALOE was successfully powered on during the second attempt Thursday, day 269 at approximately 20:00. All engineering parameters are within nominal operations and voltages on the science channels are as expected. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** On Sept. 20/21 we were successful in turning WINDII on and producing data. Prior to that we had a problem in that WINDII would come on, but without producing any data. The solution seems to depend on the timing of the sending of the uploads and while we don't understand it, we think we have a workable procedure. So we now consider WINDII ready for normal operations again, and can coordinate with TIMED again. *********** MPG *********** The MPG continues to serve as the point-of-contact for UARS instrument operations to support re-engineering of the UARS Mission Operations Concept to develop capabilities for the Science Traceability Mission. Daily processing of instrument Daily Activity Plans continues with no problems. *********** CDHF *********** Nothing received. *********** FOT *********** REPORTING PERIOD This report covers 14 September 2002 (Orbit 60203, GMT Day 257) through 20 September 2002 (Orbit 60307, GMT Day 263). 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 HALOE 261/2143 60277 POWER OFF WINDII 263/1203 60301 POWER ON The beta angle ranged between the angles of 38.3 degrees to 54.9 degrees for this report period. The beta angle is now increasing towards a maximum angle of 57 degrees on 23 September 2002 (DOY 266). 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 1.57 to 1.91 degrees C. Additional battery performance data for each battery on 06 September and 13 September 2002 are provided in Appendix D. The clock error ranged from -11.0 to 10.5 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 = 02 HALOE = 01 WINDII = 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 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 UARS FOT is now in the process of helping with the integration of the ERBS FOT. This process began on 16 September 2002. ERBS hardware has started making its way over from Building 14 and will continue to flow in this week. ERBS will take all of its events next week from the horseshoe in Building 32. We hope that the ERBS team has the same success that we experienced in getting fully operational on the new system. The hard disk on the prototype was temporarily fixed but is now malfunctioning again. This problem should go away when the new hard disk is installed this week. This will allow the FOT to test the patches that have been made by the Eclipse development team. Once the patches have been tested a new delivery of the software will be installed. This will most likely not take place until the ERBS integration is complete. MEETINGS - None this report period FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 10 October 2002 (DOY 283). 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 September 2002 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 60277 261/2143 02-326 HALOE POWER OFF 60289 262/1722 02-327 OBC CLK ADJ FR 20.6 TO 0.00 MSEC/DAY 60301 263/1203 02-328 WINDII POWER ON 60322 264/2138 02-329 OBC CLK ADJ FR 0.0 TO 20.6 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 20 September 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 20 September 2002 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 60289 262/1725 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY 60322 264/2140 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 20 September 2002 13 September 2002 - GMT Day 256 Beta = 34.6 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 -140.0/-162.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-123.2 +5.79/+4.51 +27.6/-15.2 24.5 1.040 20.9 3 +22.4/-67.2 +5.15/+3.87 +27.2/-15.2 24.3 1.040 20.6 20 September 2002 - GMT Day 263 Beta = 54.9 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 -140.0/-168.0 -3.05/-4.62 +00.0/+00.0 08.5 0.000 0.0 2 +11.2/-56.0 +4.51/+2.60 +22.4/-15.2 25.3 0.980 19.7 3 +16.8/-56.0 +3.23/+1.66 +22.0/-15.2 25.1 0.980 19.3 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 20 September 2002 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-049 FOT 60293 263/0002 31477 NONSTANDARD BLIND ACQ ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-045 FOT 59717 224/1458 14170 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 ------ ------ ----- ---- --- ----------------- 02-049 FOT 60293 263/0002 31477 NONSTANDARD BLIND ACQ