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UARS WEEKLY STATUS REPORT - 14 SEP 2001
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SOLSTICE
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SOLSTICE was in day only operations from Sept 11 to Sept 14 in support of
the yaw maneuver. Otherwise, SOLSTICE continues to operate normally, taking
solar data on all available orbital tracking periods and stellar
calibration observations whenever possible. We continue to gather enough
data to meet all the SOLSTICE science objectives during this period of
reduced tape recorder operations.
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SUSIM
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SUSIM has completed its daily solar scans this past week during
periods of predicted UARS telemetry.
As requested, we are verifying NRT files built on the PACOR-A system
versus the CDHF versions. We also expect to review similarly built
level 0 files soon.
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ACRIM
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Nothing received.
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PEM
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Nothing received.
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HALOE
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Nothing received.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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Nothing received.
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MPG
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The MPG attended the UARS Science Meeting held
on September 11, 12, and 13, 2001. Daily processing
of instrument Daily Activity Plans continues with no
problems.
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CDHF
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 01 September 2001 (Orbit 54526, GMT Day 244) through 07
September 2001 (Orbit 54630, GMT Day 250).
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
HALOE 250/2317 54630 Power OFF
The beta angle ranged between the angles of 37.0 degrees to 17.6 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 0 degrees on 11 September 2001 (DOY 254).
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 1.2 to 1.3 degrees C. Additional battery performance data for each
battery on 31 August 2001 and 7 September 2001 are provided in Appendix D.
The clock error ranged from Ð13.5 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 = 24
¥ HALOE = 01
¥ HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT
f this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/316 - 2287.496493
· Transponder B: 01/243 - 2287.499091
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 01/249 show the observatory data loss to be 303 hours, 09
minutes, 13.504 seconds. This shows no loss since the last report period. This
is a 0.39 percent data loss, which equals a 99.61 percent data capture for the
mission.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The 3-minute calibration burn was executed on the 249/1302 event of 06
September 2001. All systems performed nominally and the FOT and FDF now have a
good handle on the duty cycle and efficiency of the thrusters. The predicted
duty cycle very accurately matched the value received, therefore all planning
aids modeled the burn very well. All of the test burns have been executed
without incident and there are no plans at the present time for any more test
burns. The FOT would like to thank FDF and all other support groups in making
these test burns so smooth and painless.
MEETINGS
The UARS FOT attended a UARS CAM (Calibration Burn) on Monday, September 04,
2001.
The UARS FOT attended a UARS Monthly Status Meeting on Wednesday, September 05,
2001.
The UARS FOT attended a UARS Go-NoGo (Calibration Burn) on Thursday, September
06, 2001.
The UARS FOT attended a UARS Technical Team Meeting on Thursday, August 30,
2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 11 September 2001 (DOY 254). This
maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere
viewing).
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 07 September 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
54529 244/0517 01-545 HRDI DAY ONLY
54529 244/0601 01-544 NBTR NOOPS D-244
54543 245/0420 01-546 NBTR NOOPS D-245
54551 245/1623 01-546 NBTR NOOPS D-245
54552 245/1803 01-547 NBTR NOOPS D-246
54559 246/0602 01-547 NBTR NOOPS D-246
54567 246/1721 01-547 NBTR NOOPS D-246
54567 246/1801 01-548 NBTR NOOPS D-247
54574 247/0602 01-548 NBTR NOOPS D-247
54579 247/1400 01-549 OBC/CLK Clk Adj fr 0.0 to 20.6 msec/day
54582 247/1722 01-548 NBTR NOOPS D-247
54589 248/0602 01-550 NBTR NOOPS D-248
54593 248/1115 01-550 NBTR NBTR PBK // RTS-58
54593 248/1221 01-551 OBC CLEAR RTS CONTROL ERROR
54594 248/1400 01-552 OBC/CLK Clk Adj fr 20.6 to 0.0 msec/day
54594 248/1800 01-553 NBTR NOOPS D-249
54597 248/1800 01-554 MACS SKEW WHEEL DISABLE
54599 248/2057 01-555 OBC TABLE-65 (STAR CATALOG)
54602 249/0200 01-556 OBC/CLK Clk Adj fr 0.0 to Ð20.6 msec/day
54604 249/0519 01-553 NBTR NOOPS D-249
54609 249/1302 01-557 PM/OBC CALIBRATION BURN
54612 249/1724 01-558 OBC EPHEM THRESHOLD
54612 249/1800 01-559 NBTR NOOPS D-250
54613 249/1925 01-560 OBC EPHEM THRESHOLD
54619 250/0603 01-561 OBC Clk Adj fr -20.6 to 0.0 msec/day
54619 250/0603 01-559 NBTR NOOPS D-250
54630 250/2317 01-562 HALOE Power OFF
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 September 2001
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 07 September 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
54579 247/1405 Clk Adj fr 0.0 to 20.6 msec/day
54594 248/1404 Clk Adj fr 20.6 to 0.0 msec/day
54579 249/0200 Clk Adj fr 0.0 to -20.6 msec/day
54619 250/0622 Clk Adj fr -20.6 to 0.0 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 September 2001
31 August 2001 - GMT Day 243 Beta = 39.6 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 +728.0/+728.0 -2.73/-3.99 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-89.6 +6.11/+4.83 +27.2/-15.2 24.2 1.030 21.4
3 +22.4/-56.0 +5.15/+3.87 +27.2/-15.2 24.0 1.020 21.1
7 September 2001 - GMT Day 250 Beta = 17.6 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 +728.0/+728.0 -3.05/-4.31 +0.0/+0.0 11.8 0.000 0.0
2 +11.2/-67.2 +6.44/+5.15 +29.6/-14.4 23.8 1.040 22.0
3 +22.4/-44.8 +5.15/+3.87 +28.8/-14.4 23.8 1.030 21.5
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 September 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-054 FOT 54577 247/1036 14170 Generic Late Acquisition
01-055 FOT 54628 250/1927 N/A Power outage
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-055 FOT 54628 250/1927 N/A Power outage
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-054 FOT see list Sept. 01 14170 Generic Late Acquisition
SEVNTFW01/36