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UARS WEEKLY STATUS REPORT - 14 June 2002
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM was turned off for the eclipse. As usual the instrument got very
cold very quickly, so it took about an additional day to warm up again.
Otherswise, SUSIM successfully performed its daily mid-resolution and
MgII solar scans 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 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.
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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 June 2002 (Orbit 58626, GMT Day 152) through 07
June 2002 (Orbit 58730, GMT Day 158).
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
The beta angle ranged between the angles of 26.1 degrees to 34.1
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 34 degrees on 08 June 2002 (DOY 159).
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 1.27 to 1.28 degrees C. Additional
battery performance data for each battery on 31 May and 07 June 2002
are provided in Appendix D.
The clock error ranged from -10.8 to 10.0 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.
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
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 1
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 01/333 - 2287.496855
Transponder B: 02/043 - 2287.498879
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 is in the process of implementing some minor changes to the
Eclipse system to help optimize operations. The new release of the
Eclipse software is currently being tested. If the testing continues
to go well, this release should be moved to operations by mid month.
The FOT awaits a decision regarding opening firewall rules for the new
TAC systems on the new UARS subnet. This is necessary to move the TAC
replacement systems out of building 14 and into the control center. A
decision should be made this week.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 21 June 2002 (DOY 172). This
maneuver will be a Reverse to Forward Flight maneuver (Southern
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 07 June 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
58675 155/0711 02-199 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
58692 156/1030 02-200 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 June 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 07 June 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
58675 155/0715 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
58692 156/1032 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 June 2002
31 May 2002 - GMT Day 151 Beta = 23.7 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 -3.05/-4.31 +00.0/+00.0 0.0 0.000 0.0
2 +11.2/-100.8 +5.79/+4.51 +28.8/-14.4 24.5 1.030 20.7
3 +22.4/-044.8 +4.51/+3.23 +28.0/-14.4 24.5 1.020 20.4
07 June 2002 - GMT Day 158 Beta = 34.1 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 -3.05/-4.62 +00.0/+00.0 0.0 0.000 0.0
2 +11.2/-106.4 +5.15/+3.87 +28.0/-14.4 25.1 1.030 20.1
3 +22.4/-044.8 +4.19/+2.92 +27.2/-14.0 25.1 1.020 19.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 June 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-035 FOT 58719 158/0606 44490 WSGT EQUIP PROBLEMS
02-035 FOT 58720 158/0746 44490 WSGT EQUIP PROBLEMS
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-026 FOT See List May 01 N/A Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
02-033 FOT 58553 147/0359 N/A SSPP IN WAIT MODE/PLANNING ERR
02-035 FOT 58719 158/0606 44490 WSGT EQUIP PROBLEMS
02-035 FOT 58720 158/0746 44490 WSGT EQUIP PROBLEMS