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UARS WEEKLY STATUS REPORT - 31 Oct 2003
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SOLSTICE
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SOLSTICE continues to perform nominally, taking solar data on all
available orbital tracking periods. This week we received about 53% of
each day's data amounting to nearly 640 minutes of solar observing time
per day.
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SUSIM
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SUSIM 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 18 October 2003 (Orbit 66202, GMT Day 291) through
24 October 2003 (Orbit 66306, GMT Day 297).
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
AXIS 292/1230 66225 POWER ON AXIS 2
The beta angle ranged between the angles of 60.7 degrees to 67.3
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 1.26 to 1.58 degrees C. Additional
battery performance data for each battery on 17 October and 24 October
2003 are provided in Appendix D.
The clock error ranged from -10.5 to 09.8 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 = 03
SUSIM = 00
SOLSTICE = 00
PEM = 01
HALOE = 00
HRDI = 00
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
One (1) Anomaly Report 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
Testing of the new 3 TDRS functionality on both the Eclipse and CMS
continued this week. Raytheon provided a preliminary build, which was
installed on the prototype on 22 October 2003. So far only two minor
problems have been found but will be fixed in the official build
delivery next week. A few tests still need to be completed next week
in order to verify all functionality is working as planned. A problem
was also found with the new CMS code, in regards to how the three TDRS
ephemeris load is built. Software development is analyzing the
problem and will hopefully find a fix quickly.
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 the second week in November so that
the end-to-end testing can begin.
MEETINGS
-None this report period
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 24 October 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
66203 291/0220 03-277 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66225 292/1230 03-278 AXIS POWER ON AXIS 2
66261 294/2239 03-279 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
66288 296/1834 03-280 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 24 October 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 24 October 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
66203 291/0220 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66261 294/2239 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
66288 296/1834 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 24 October 2003
17 October 2003 - GMT Day 290 Beta = 57.4 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/-4.62 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-22.4 +4.51/+2.60 +22.4/-14.4 26.4 1.030 17.1
3 +16.8/-22.4 +3.23/+1.97 +22.0/-14.4 26.4 1.020 16.7
24 October 2003 - GMT Day 297 Beta = 67.3 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 -2.74/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-22.4 +3.55/+1.97 +19.2/-15.2 26.7 1.050 15.7
3 +11.2/-33.6 +2.60/+1.34 +18.8/-14.8 26.7 1.050 15.4
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 October 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-050 FOT 66301 297/1406 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
03-050 FOT See List Oct 03 30832 Generic Late Acquisition