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UARS WEEKLY STATUS REPORT - 14 NOV 2003
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SOLSTICE
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SOLSTICE was under daytime only operations for three days this week in
support of the yaw maneuver. This limits but does not eliminate our
solar observations as we are powered off during orbit night. We received
nearly 52% of each day's data amounting to 370 minutes of solar
observing time per day.
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SUSIM
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SUSIM was turned off for the yaw-around on Nov. 10. For earlier
days, the instrument successfully gathered all of its daily mid
(1.1 nm) resolution, weekly offset, and O2 occultation scans during
periods of UARS telemetry or periods of onboard tape recording.
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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
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 01 November 2003 (Orbit 66412, GMT Day 305) through
07 November 2003 (Orbit 66517, GMT Day 311).
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
PEM (Z/H) 310/2312 66502 POWER OFF
PEM AXIS 311/0313 66504 POWER OFF
HALOE 311/2309 66517 POWER OFF
The beta angle ranged between the angles of 41.5 degrees to 14.4
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 11 November 2003 (DOY 315).
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 0.95 to 0.97 degrees C. Additional
battery performance data for each battery on 31 October and 07
November 2003 are provided in Appendix D.
The clock error ranged from -10.3 to 0.4 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 = 00
SUSIM = 00
SOLSTICE = 00
PEM = 02
HALOE = 01
HRDI = 00
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 00
Zero (0) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Zero (0) 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 official release of the new Eclipse software was received on 04
November 2003. The FOT checked all new modifications made to the
software and all changes made are working properly. The FOT also
performed some regression testing to make sure existing functionality
had not changed and the testing was successful. Only a few database
changes were requested to modify the state text of a few 3 TDRS
pertinent mnemonics. These changes will be delivered and tested next
week.
The CMS software was tested this week and the ephemeris generation
process is now working properly. Several tests were performed and all
executed as planned. Acceptance testing continued after this problem
was resolved and a new issue with the CMS pollers was found on CMS-B.
This will most likely require some more code changes and will
hopefully be resolved early next week.
In parallel, the FOT is also working with the FSW group to review and
test the new flight software uplink procedure. Testing has gone well
so far and should be completed by next week, so that the end-to-end
testing can begin.
MEETINGS
The FOT attended the UARS Monthly Status review on 04 November 2003.
The FOT also attended an Eclipse PSR meeting on 04 November 2003 to
review the status of all the changes made in the latest build (2.0.4)
of the software.
Also the FOT attended a 3 TDRS transition meeting on 06 November 2003
in order to hash out the details of how best to move from 2 TDRS
systems to 3 TDRS systems with the least amount of operational
downtime. Also discussed were methods to go back to 2 TDRS systems in
the event of an unforeseen problem with the 3 TDRS patch.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 11 November 2003 (DOY 315).
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 November 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
66502 310/2312 03-290 PEM (Z/H) POWER OFF
66504 311/0313 03-291 PEM AXIS POWER OFF
66517 311/2309 03-292 HALOE POWER OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 November 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 November 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 November 2003
31 October 2003 - GMT Day 304 Beta = 42.7 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 -700.0/-700.0 -3.05/-4.63 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-50.4 +5.79/+4.50 +26.4/-15.2 24.6 1.050 20.5
3 +16.8/-67.2 +4.50/+3.23 +25.6/-15.2 24.5 1.040 20.0
07 November 2003 - GMT Day 311 Beta = 14.4 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 -700.0/-700.0 -3.05/-4.63 +00.0/+00.0 07.2 0.000 0.0
2 +16.8/-78.4 +5.79/+4.82 +28.8/-14.4 24.2 1.020 21.2
3 +16.8/-100.8 +4.82/+3.87 +28.0/-14.4 24.0 1.020 21.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 November 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-050 FOT See List Oct 03 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
------ ------ ----- ---- --- -----------------
-None this report period.