******************************************************************** UARS WEEKLY STATUS REPORT - 30 SEP 2005 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** Nothing received. *********** PEM *********** HEPSA data files are version 2. Currently, HEPSA data between 1991274 and 2004273 has been reprocessed and archived at the GSFC DAAC. HEPSA data between 2004274 and 2005099 has been processed and is waiting for archival at the DAAC. MEPS data files are version 1. Processed MEPS data files at the DAAC archive are between 1991274 and 2004259. MEPS data between 2004260 and 2005099 has been processed and is waiting for DAAC archival. HEPSB data files are version 1. HEPSB data files between 1991274 and 1991366 have been processed and are waiting for DAAC archival. Processing of all PEM DAAC data files has been suspended until the DAAC catches up with archiving all processed data files. It was discovered that DAAC changed the access IP node. This caused failure accessing SwRI to retrieve Level 2 data. A change order at SwRI has been initiated. Tests of the AXIS1 data file formats have been successful. The AXIS1 format design has been coded. A test file has been generated. A check program with processing scripts have also been generated. Example binary read program is complete and verified. These results have been sent to the project. Creation of the AXIS1 data documents for DAAC data will begin shortly. PEM continues to receive NMC data files from NOAA. No problems have been encountered since updates have occurred. 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 Requests have been received for storm spectral data. Overview plots were produced and these plots may be found on the web at http://climatology.space.swri.edu/UARS_images_postedJune2004.html for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000, March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and November 11-12 of 2001. PEM has received a request for data from the super storm of November 2004. The Dst value showed sudden commencement early on November 7, 2004 reaching a Dst value of about -380 gamma early on November 8, 2004. PEM was not active at that time and became active late on November 8, 2004 in day only mode. A second peak of about -280 gamma was observed on November 11, 2004. PEM became active in day-light only mode late on November 8. PEM survey spectrograms for November 8-18 of 2004 may be found at: http://climatology.space.swri.edu/UARS_images_fromRudy.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 recieved. *********** MPG *********** The MPG is participating in the on-going UARS end of mission planning activities. 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 17 September 2005 (Orbit 76716, GMT Day 260) through 23 September 2005 (Orbit 76836, GMT Day 266). 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 -NONE THIS REPORT PERIOD A Forward-to-Reverse Yaw Around maneuver (number 143) was successfully executed in Orbit 76740 beginning 260/ 14:47:03Z and completing at 260/ 15:24:13Z on 17 September 2005. All instruments were in their off or standby mode. Due to the SA position at 265 degrees, the effective night length of the spacecraft after the maneuver was approximately 59.80 minutes. Post maneuver analysis of data indicate that during the Yaw Around, the end-of-night load bus voltage was 24.00 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were approximately 8.85 and 31.57 percent respectively. The next (reverse-to-forward) YAW is scheduled for 24 October 2005 (DOY 297). The beta angle ranged between the angles of 02.1 degrees to 24.1 degrees for this report period. The beta angle is now increasing towards a maximum angle of 62 degrees on 6 October 2005 (DOY 279). 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 10.6 to 9.2 degrees C. Additional battery performance data for each battery on 16 September 2005 and 23 September 2005 are provided in Appendix D. The clock error ranged from 10.5 to -10.9 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 = 14 HALOE = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Two (2) Anomaly Reports 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 This week the FOT continues to closely monitor the condition of battery 2 and battery 3. Battery 2 and 3 have not been sharing load well since the cell failure on battery 2. Battery 3 now carries almost 90% of the power load while battery 2 provides the remaining 10%. The orbits leading up to the yaw were of greatest concern as the EON load bus voltage was low due to the beta angle. NASA power branch has been providing daily support in monitoring the UARS battery condition. The FOT has been authorized to disable all platform and instrument heaters on the SSPP. This will be done at the earliest available opportunity. The FOT completed the planned repeat 30-second burn on 19 September 2005. The burn started as planned at 262/1455 and terminated 30 seconds later. Preliminary analysis showed that the BIAS that was selected allowed the attitude control thrusters to come on sooner and the translation thrusters came back on with several seconds left in the 30-second burn. The FOT also saw the translation thrusters off- pulse as planned. This engineering burn performed as expected with no surprises. The success of the 2nd 30-second burn cleared the way for the final planned engineering burn of 2 « minutes on 22 September 2005. The primary goal of this burn was to see the spacecraft achieve steady state with all 4-translation thrusters firing. The burn started as planned at 265/1459 and terminated 150 seconds later. Post-burn analysis showed that UARS achieved steady state approximately 35 to 40 seconds into the burn. The initial transient was almost identical to the earlier 30-second burn that was done on 19 September 2005. The individual thruster duty cycles were A [59.0%]; B [50.8%]; C [89.1%]; D [89.0%]. After the initial transient, translation thrusters C and D operated at 100% duty cycle. The overall duty cycle for this 150- second burn was 72%. While this is lower than the predicted 90% that was used to plan out the burn schedule for UARS, it will increase and asymptotically approach 80% as the burns increase in length. The FOT has been directed to stand down from the first planned orbit lowering burn on 29 September 2005 by NASA headquarters. This stand down order, coupled with the slightly reduced duty cycle of the UARS 4- thruster mode will mean that the FOT will not be able to keep to its plan of de-orbiting UARS as quickly as possible due to the cell failure on battery 2. The earliest that the FOT will be able to completely expend all the hydrazine onboard will be sometime in early to mid December. MEETINGS The FOT attended a De-boost status meeting / CAM this week on 19 September 2005. There were no concerns raised at the CAM, and the FOT was given permission to proceed with the calibration burn on 19 September 2005. The FOT attended the UARS End of Mission Peer Review on 21 September 2005. One RFA came out of the review. The RFA was to document waive off and abort criteria for the long duration burns for both an ACS perspective and a collision avoidance perspective. The FOT attended another CAM on 21 September 2005. The FOT presented two procs that would be used instead of manual commanding to help reduce the time needed to setup for a burn. The proc and contingency commands were reviewed. There were no concerns raised with using procs instead of manual commanding for the 2 « minute burn on 22 September 2005. FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 24 October 2005 (DOY 297). This maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere viewing). The FOT has been directed to stand down from our first scheduled 18- minute burn by NASA HQ. The burn was scheduled for 29 September 2005, and has been canceled. UARS is still go for executing the scheduled 18-minute burn on 04 October 2005 and 06 October 2005. 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 23 September 2005 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 76738 260/1213 05-332 MPS VT L6 TO L7 76739 260/1353 05-333 MACS YAW - FWD TO REV 76741 260/1632 05-334 OBC BANK DUMPS 76755 261/1544 05-335 HALOE RESTOWED - REV 76769 262/1315 05-336 MACS ENG BURN - STEP 1 76770 262/1402 05-336 MACS ENG BURN - STEP 3,5,6 76770 262/1445 05-336 MACS ENG BURN - STEP 7-24 76773 262/1940 05-337 OBC OPEN EPHEM THRESHOLD / LOADS 76774 262/2057 05-337 OBC DEFAULT EPH THRESHOLD 76774 262/2158 05-338 OBC CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 76775 262/2339 05-339 OBC ATC NOOP 76797 264/0920 05-340 OBC CLK ADJ FR -20.6 TO 0.0 MSEC/DAY 76814 265/1258 05-341 PM ENGINEERING BURN 2:30 - STEP 1 76814 265/1351 05-341 PM ENG BURN - STEP 3,4,5 76815 265/1453 05-341 PM ENG BURN - STEP 6-23 76816 265/1616 05-343 MPS VT LEVEL 7 TO LEVEL 6 76816 265/1616 05-342 OBC EPHEM REJECT CORRECTION 76818 265/2006 05-344 OBC POST-BURN EPHEM LOAD 76819 265/2149 05-345 OBC ATC NOOP XMTR ON 76817 265/1745 05-342 OBC DEFAULT EPHEM TOLERANCE 76823 266/0326 05-346 MPS VT L-6 TO VT L-7 APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 23 September 2005 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 23 September 2005 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 76774 262/2202 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY 76797 264/0922 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 23 September 2005 16 September 2005 - GMT Day 259 Beta = 06.7 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(%) --- ------- -------- ---------- ----- ------- ------ 1 728.0/ 728.0 -2.42/ -3.68 +00.0/+00.0 04.6 0.00 0.0 2 -700.0/-700.0 +3.87/ -0.23 +21.6/-13.6 24.3 1.03 7.1 3 067.2/-033.6 +8.07/ +7.09 +49.6/-22.8 24.2 1.01 28.5 23 September 2005 - GMT Day 266 Beta = 24.1 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(%) --- ------- -------- ---------- ----- ------- ------ 1 728.0/ 728.0 -1.79/ -3.05 +00.0/+00.0 04.6 0.00 0.0 2 -700.0/-700.0 -0.54/ -1.79 +16.8/-06.8 26.4 1.05 3.7 3 067.2/-056.0 +10.06/ +7.41 +50.4/-25.0 26.4 1.03 29.2 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- 76738 260/1213 L6 -> L7 76816 265/1616 L7 -> L6 76823 266/0326 L6 -> L7 APPENDIX E UARS ANOMALY REPORTS Week ending 23 September 2005 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 05-044 FOT 76773 262/1940 30832 Generic Late Acquisition 05-044 FOT 76774 262/2158 30832 Generic Late Acquisition 05-044 FOT 76803 264/2009 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. 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 ------ ------ ----- ---- --- ----------------- 05-042 MPS 76339 233/2347 N/A BATTERY 2 DIFFV -700mV 05-044 FOT See List Sept 05 30832 Generic Late Acquisition