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UARS WEEKLY STATUS REPORT - 29 Nov 2002
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SOLSTICE
***********
Nothing received.
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SUSIM
***********
SUSIM successfully gathered all of its daily mid-resolution and MgII
solar scans this past week during periods of predicted UARS telemetry.
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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 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.
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CDHF
***********
Nothing received.
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FOT
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REPORTING PERIOD
This report covers 16 November 2002 (Orbit 61150, GMT Day 320) through
22 November 2002 (Orbit 61255, GMT Day 326).
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
SOLSTICE 324/1355 61219 POWER ON - FULLTIME
SUSIM 325/1456 61235 POWER ON
PEM 326/1347 61249 POWER ON
A Reverse-to-Forward Yaw Around maneuver (number 114) was successfully
executed in Orbit 61190 beginning 322/16:28:53Z and completing at
322/17:06:03Z on 18 November 2002. All instruments were in their off
or standby mode (including HRDI and PEM). Due to the SA position at
269 degrees, the effective night length of the spacecraft after the
maneuver was approximately 55.71 minutes. Post maneuver analysis of
data indicate that during the Yaw Around, the end-of-night load bus
voltage was 26.40 volts and the average depths of discharge (DODs) on
Batteries 2 and 3 were approximately 20.27 and 19.57 percent
respectively. The next (forward-to-reverse) YAW is scheduled for 18
December 2002 (DOY 352).
The beta angle ranged between the angles of 08.9 degrees to 10.8
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 35 degrees on 04 December 2002 (DOY 338).
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 0.94 to 1.28 degrees C. Additional
battery performance data for each battery on 15 November and 22
November 2002 are provided in Appendix D.
The clock error ranged from -21.1 to 10.8 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 = 06
SOLSTICE = 01
SUSIM = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Three (3) 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 FOT continues to monitor UARS' attitude following the UFLTR
reinitialization on 13 November 2002. The reinitialization has shown
lower residuals in the FSS and quieter gyro biases, but there are
still minor attitude errors which are induced during each orbit. In
an attempt to correct this behavior a new TAM alignment matrix was
uplinked which has helped but not solved the problem. It may take
several days to determine what is causing this disturbance.
MEETINGS
- None this report period.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 18 December 2002 (DOY 352).
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 22 November 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
61179 321/2211 02-440 MACS GYRO BIAS RESET
61189 322/1514 02-451 OBC YAW MANUEVER
61190 322/1546 02-451 OBC YAW MANUEVER
61191 322/1724 02-451 OBC YAW MANUEVER
61191 322/1724 02-452 OBC CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
61206 323/1646 02-451 OBC YAW (RETURN TO VT LEVEL 5)
61207 323/1830 02-453 MACS LOAD FWD GYRO BIAS VALUES
61211 324/0153 02-454 OBC CLK ADJ FR -20.6 TO 0.00 MSEC/DAY
61219 324/1355 02-455 SOLSTICE POWER ON - FULLTIME
61235 325/1456 02-456 SUSIM POWER ON (BEGIN)
61236 325/1643 02-456 SUSIM POWER ON (CONTINUED)
61238 325/2007 02-457 TAM/UFLTR TAM NOISE / CYCLE UPDATE / ALIGN
61239 325/2146 02-457 TAM/UFLTR TAM NOISE / CYCLE UPDATE / ALIGN
61247 326/1126 02-456 SUSIM POWER ON COMPLETE
61249 326/1347 02-458 PEM (Z/N) POWER ON
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 22 November 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 22 November 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
61191 322/1730 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
61211 324/0159 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 22 November 2002
15 November 2002 - GMT Day 319 Beta = 16.0 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 -3.36/-4.62 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-56.0 +5.79/+4.51 +24.8/-12.8 25.1 1.040 21.1
3 +22.4/-56.0 +4.83/+3.23 +23.6/-12.0 25.1 1.040 20.5
22 November 2002 - GMT Day 326 Beta = 10.8 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 -156.8/-179.2 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-22.4 +4.51/+3.23 +28.8/-13.2 26.2 1.040 19.5
3 +28.0/-22.4 +3.23/+2.29 +28.0/-12.8 26.2 1.020 19.1
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
- None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 22 November 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-058 FOT 61191 322/1646 31767 YAW Late Acq (HGA Track)
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-057 FOT 60630 285/1008 30382 GENERIC LATE ACQUISITION
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-001 FOT 60775 295/0122 N/A OBC CRASH
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-056 FOT 60775 295/0122 N/A OBC CRASH
02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR
02-059 FOT 61191 322/1646 31767 YAW LATE ACQ (HGA TRACK)