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UARS WEEKLY STATUS REPORT - 14 FEB 2003
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
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SUSIM
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Nothing received.
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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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HALOE continues successful operations with all engineering parameters
within nominal values. We have detected more failed processing days
requiring reprocessing event-by-event. Some of the files in January and
February were corrupted and best described as a shift in the time in the
files. It apparently has been traced to an Internet problem at GSFC and a
solution is being pursued.
Use of the tape recorder continues to be successfully scheduled and most of
the HALOE events are captured by TDRS or the recorder. However we are
starting to notice some data drop out that is affecting results. The HALOE
FOT is now more closely monitoring the data and categorizing data drop out
and bad data.
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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.
This week electronic communications have not worked between
the UARS Command Management System and the Remote Analysis
Computers (RACs) of HALOE, HRDI and SUSIM. This problem
appears to be caused by outage of the NASCOM circuit at GSFC
between Building 23 and Building 32. Technicians have looked
at this NASCOM circuit from time-to-time during the week, but
have been unable to fix it. Maybe they will have better luck
next week. Meanwhile, these HALOE, HRDI, and SUSIM are
submitting their daily activity plans (DAPs) and
microprocessor loads (MPLs) via email to the MPG where a
work around procedure is used to add these DAPs and MPLs
to the CMS data base.
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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 February 2003 (Orbit 62308, GMT Day 032) through
07 February 2003 (Orbit 62412, GMT Day 038).
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
HALOE 031/1241 62300 POWER ON
PEM 033/1317 62331 DAY ONLY
WINDII 034/1314 62347 POWER ON
PEM 035/1233 62362 AXIS-1 ON
The beta angle ranged between the angles of 15.6 degrees to 34.6
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 43 degrees on 13 February 2003 (DOY 044).
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 0.96 to 1.28 degrees C. Additional
battery performance data for each battery on 31 January and 07
February 2003 are provided in Appendix D.
The clock error ranged from -4.5 to 3.2 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 = 00
HALOE = 02
PEM = 02
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) operational support problem 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
A discussion held with UARS FSW personnel lead the FOT to
reinvestigate the UARS Safehold Anomaly. During this re-investigation
the FOT found that during the anomalous pass, the HRDI load was sent
with 30 additional commands pre-pended to the load (a bit bust of
these commands will be performed next week). These thirty commands
were generated by Eclipse due to a bug in the "cmdprt.exe" code. This
bug is being fixed and a patch will be tested and installed next week.
In the meantime, the FOT is aware of the conditions that trigger these
bad commands and have informed all FOT personnel to avoid these
conditions.
MEETINGS
The FOT attended the UARS Monthly Status Review on 4 February 2003.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060). 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 07 February 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62300 031/1241 03-029 HALOE POWER ON
62305 031/1939 03-030 HALOE POWER ON PT 2
62331 033/1317 03-032 PEM POWER ON DAY ONLY MODE
62347 034/1314 03-033 WINDII POWER ON
62360 035/1233 03-034 PEM AXIS 1 ON @ 7W START
62362 035/1419 03-034 PEM AXIS 1 ON @ 7W DONE
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 February 2003
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 February 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period.
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 February 2003
31 January 2003 - GMT Day 031 Beta = 12.5 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 -162.4/-184.8 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-89.6 +5.79/+3.87 +29.6/-12.8 25.8 1.020 21.3
3 +28.0/-44.8 +4.51/+2.60 +28.8/-12.8 25.8 1.020 20.9
07 February 2003 - GMT Day 038 Beta = 34.6 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 -168.0/-190.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-112.0 +5.79/+4.83 +28.8/-15.2 24.5 1.040 21.0
3 +22.4/-67.2 +5.15/+3.87 +28.4/-16.0 24.5 1.030 20.7
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 February 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-004 FOT 62393 037/1640 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-004 FOT 62393 037/1640 30832 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-004 FOT 62393 037/1640 30832 Generic Late Acquisition