******************************************************************** UARS WEEKLY STATUS REPORT - 22 OCT 1999 ******************************************************************** *********** SOLSTICE *********** SOLSTICE continues to operate normally, collecting solar data on all available orbital tracking periods and stellar calibration observations, whenever possible. *********** SUSIM *********** SUSIM successfully gathered its normal solar, offset and occultation data this past week without apparent problems. *********** ACRIM *********** Nothing received. *********** PEM *********** The PEM/AXIS activated between October 3 and October 20. While AXIS was active, it produced energy deposition from 16 pixels based on precipitating electrons derived from measured X-ray fluxes. AXIS was in its full power mode during this time period. The PEM spectrometers continue to be active under PMON control. While under PMON control, the PEM instrument computed energy deposition from its particle spectrometers. The FOT and the PEM team are have completed updating the PEM activation sequence which effects the PEM/HEPS (> 30 keV particles). PEM PMON activation is set for the beginning of power orbit day. The beginning of power orbit day is defined as when: array current greater than 5 amps, and array voltage greater than 53.5 volts, and any battery current greater than 2.0 amps The end of power orbit day (PEM deactivation) is defined as when: time in power orbit day greater than 4 minutes, and array current less than 9 amps, and all battery currents less than 0.2 amps Power orbit day periods vary depending upon beta angle: about 39-40 minutes at yaw about 50-51 minutes at max beta Current activation takes about 6 min for full activation. During the activation sequence, various components of PEM become active at all different times, beginning with the PEM magnetometer (at about on activation time) and ending with the HEPS-2 components (6 min later). Thanks to Dimitrios Mantziaras of the FOT for assisting PEM with the activation sequence timing and getting this task completed. *********** HALOE *********** Nothing received. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing received. *********** MPG *********** Routine processing of instrument Daily Activity Plans continues with no problems. The MPG continues to assist the Project Scientist with the scheduling of instrument operations. *********** CDHF *********** The CDHF processed current day data through level 3 for all active instruments. Additionally, CDHF personnel reprocessed: (R)= Requested (C) = Complete, (F)= Failed (L) = Days remaining to reprocess. 13 days CLA (7.0) PROD (L1-L3) (473R-320C-17F=136L) 26 days GPI (4.05) PROD (CLAES L3B) (222R-196C-1F=25L) 2 days HAL (4.82) PROD (L1-L3)(TEST) (2R-2C=0L) The CDHF has successfully tested HALOE V4.82 formal software delivery on CDHF6 and CDHF7. We plan on testing WINDII V5.11A formal software delivery next week. CDHF REHOST: - UARS CDHF has been working on moving utilities and command files to rehost system to aid in the production processing and data monitoring. - HALOE V4.82 formal software delivery has been installed on the rehost system. We are preparing to start testing the software this week: - The CDHF continues to perform reboots of CDHFA/B as scheduled on Wednesdays to check system settings, logicals, etc at startup as changes continue to be made on these systems. DAAC DATA: Data created in the month of August 1999 for HALOE, PEM, NMC, and UKMO has been previewed. SUSIM Level 3BS (output V20) data continues to be previewed and loaded into the DAAC Transfer Tables. DAAC has been notified. CDHF pending software upgrades: none *********** FOT *********** REPORTING PERIOD This report covers 9 October, 1999 (Orbit 44136, GMT Day 282) through 15 October 1999 (Orbit 44240, GMT Day 288). 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 WINDII 285/0237 44182 On HALOE 286/1130 44203 Off HALOE 286/1314 44204 On HRDI 286/1532 44205 Restart The beta angle ranged between the angles of 45.9 degrees to 46.8 degrees for this report period. The beta angle is now decreasing toward a minimum angle of 0 degrees on 29 October 1999 (DOY 302). 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 23.8 V end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 1.0 to 1.3 degrees C. Additional battery performance data for each battery on 08 October 1999 and 15 October 1999 are provided in Appendix D. The clock error ranged from -11.1 to 11.0 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. % ALERTS = 00 % OUT-OF-LIMITS = 00 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). % PEM = 01 % WINDII = 01 % HARDI = 01 % HALOE = 03 % FOT = 03 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. % FOT = 03 One (1) Anomaly Reports remained OPEN at the end of this report period (see Appendix E). TRANSPONDER FREQUENCIES: % Transponder A: 99/263 - 2287.496947 % Transponder B: 99/265 - 2287.498700 GROUND SYSTEM OPERATION Two (2) operational support problems occurred this period. Anomaly Reports are included in Appendix E. The data loss calculations supplied by Data Capture Facility (DCF) from mission start through UTC Day 99/288 show the observatory data loss to be 24 hours, 55 minutes, 40.404 seconds (an increase of 0.384 seconds since the last report period). This is a 0.0353 percent data loss which equals a 99.9647 percent data capture for the mission. The increase of 3.296 seconds occurred over three (3) days: 7 2.432 seconds on Day 283 due to an Data hit. 7 0.352 seconds on Day 284 due to an Data hit. 7 0.512 seconds on Day 287 due to an Data hit. OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS The Leonid plan was completed by updating the previous years plan without the use of the Earth Sensor. After consulting with FDF and NOAA analysts, the impact by the Leonids to UARS is believed to be significantly less substantial than last year. This opinion was presented at the UARS monthly and mutual concurrence was established to make Leonid plans without the use of the Earth Sensor. The timing on the PEM instrument was fixed this week. Everything on our end appears to have executed as planned. We are awaiting from the PEM instrument team after the data has been looked at on their end. YEAR 2000 OPERABILITY SUPPORT The UARS FOT plans to take part an NCC Y2K test planned for Tuesday of next week. The UARS simulator may be configured to send some test blocks. MEETINGS None. FUTURE SIGNIFICANT EVENTS A second meeting to discuss the UARS Safehold configuration and concerns for the MPS and its batteries is planned for Friday, November 5th. This meeting will be a closed meeting with only the FOT and specialized engineering support attending. PEM requested to have the timing in their turn on sequence tightened up in yet another area. This is expected to be accomplished within the next few weeks. PERSONNEL CHANGES None. Attachments: Appendix A, Real-time Commands 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 October 1999 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------- 44156 283/0919 99-334 OBC Clk Adj fr 20.6 to 0.00 msec/day 44182 285/0237 99-335 WINDII Power ON 44182 285/0237 99-336 OBC Clk Adj fr 0.00 to 20.6 msec/day 44203 286/1130 99-337 HALOE Power OFF 44204 286/1314 99-338 HALOE Power ON 44205 286/1532 99-339 HRDI Restart 44205 286/1532 99-340 HALOE Sunrise update 44219 287/1311 99-341 OBC Clk Adj fr 20.6 to 0.00 msec/day 44223 287/1945 99-342 PEM Update PMON Sequence _______________________________________________________________________________ APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 15 October 1999 The following Out-Of-Limits occurrences were detected: MNEMONIC STATE DESCRIPTION ORBITS --------- ----- ------------ ------ No Alerts to report this report period. The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS --------- ------------ ------ No Alerts to report this report period. _______________________________________________________________________________ APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 15 October 1999 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ---- ----------------- 44156 283/09:25 (10 Oct 99) from 20.6 to 00.0 msec/day 44182 285/02:44 (12 Oct 99) from 00.0 to 20.6 msec/day 44219 287/13:15 (14 Oct 99) from 20.6 to 00.0 msec/day APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 15 October 1999 08 Oct 1999 - GMT Day 281 Beta = 45.9 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 -112.0/-134.4 -3.05/-3.99 +0.0/+0.0 16.5 0.000 0.0 2 +22.4/-33.6 +5.79/+4.51 +27.6/-15.6 25.3 1.022 21.4 3 +22.4/-44.8 +4.83/+3.87 +27.2/-15.2 25.1 1.025 21.0 15 Oct 1999 - GMT Day 288 Beta = 46.8 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 -106.4/-128.8 -3.05/-4.31 +0.0/+0.0 16.5 0.000 0.0 2 +11.2/-44.8 +5.47/+4.51 +27.6/-15.2 25.1 1.023 21.1 3 +22.4/-33.6 +4.51/+3.23 +27.2/-16.0 25.1 1.024 20.8 V/T LEVEL CHANGES ORB# TIME LVL FR-TO ----- ---- ---------- no changes V/T 5 APPENDIX E UARS ANOMALY REPORTS Week ending 15 October 1999 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors 99-065 FOT 44179 284/2216 N/A TAC 8 Crashed 99-066 FOT 44222 287/1815 N/A AP CRASH ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-062 FOT 44085 278/1425 21435 TAC 8 Crashed 99-063 FOT 44088 278/2059 N/A TAC 8 Crashed 99-065 FOT 44179 284/2216 N/A TAC 8 Crashed 99-066 FOT 44222 287/1815 N/A AP CRASH ANOMALY INVESTIGATION REPORTS GENERATED AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors SEVNTFW99/42