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UARS WEEKLY STATUS REPORT - 24 October 2003
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SOLSTICE
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During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods. This week we
received about 54% of each day's data amounting to about 630 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 11 October 2003 (Orbit 66097, GMT Day 284) through
17 October 2003 (Orbit 66201, GMT Day 290).
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
HALOE 288/1856 66168 POWER OFF
The beta angle ranged between the angles of 33.6 degrees to 57.4
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 68 degrees on 22 October 2003 (DOY 295).
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 1.91 degrees C. Additional
battery performance data for each battery on 10 October and 17 October
2003 are provided in Appendix D.
The clock error ranged from -10.5 to 0.98 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
SUSIM = 00
SOLSTICE = 00
PEM = 00
HALOE = 01
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
The FOT continues to move forward with the 3 TDRS implementation. The
new database has been recompiled and moved onto the UARS Command
Management System. The FOT has also received the official release of
the new CMS software and has commenced testing. In parallel, the FOT
has also initiated working with the FSW group to review and test the
new flight software uplink procedure.
The FOT also successfully tested the DSN command path interface with
Canberra on 16 October 2003. This was done in preparation for the new
Eclipse build which will include DSN functionality. In the next few
weeks the FOT will be testing the downlink portion of the DSN
interface.
MEETINGS
The FOT attended the UARS Bi-weekly DRB on 14 October 2003 to discuss
the status of the new build delivery scheduled for the end of this
month. The new build will contain fixes for several DRs and the
functionality needed to support the 3 TDRS effort.
The FOT also attended the UARS 3 TDRS Bi-weekly meeting to discuss the
status of all efforts involved in getting ready to implement the new 3
TDRS mode of operations. So far no major delays or problems have been
found and the effort remains on schedule for late November.
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 17 October 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
66148 287/1201 03-274 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66168 288/1856 03-275 HALOE POWER OFF
66172 289/0005 03-276 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 17 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 17 October 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
66148 287/1205 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66172 289/0008 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 17 October 2003
10 October 2003 - GMT Day 283 Beta = 29.3 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 -3.05/-4.62 +00.0/-50.0 07.2 0.000 0.0
2 +16.8/-67.2 +6.11/+4.51 +28.4/-50.0 25.4 1.030 20.5
3 +22.4/-50.4 +4.83/+3.23 +27.2/-50.0 25.3 1.030 20.0
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
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 17 October 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-050 FOT 66098 284/0156 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-051 HRDI 66083 283/0158 NA HRDI Not Accepting Microloads
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