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UARS WEEKLY STATUS REPORT - 25 APR 2003
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and occultation scans this past week during periods of 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 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 12 April 2003 (Orbit 63360, GMT Day 102) through 18
April 2003 (Orbit 63465, GMT Day 108).
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
PEM 102/1158 63367 POWER ON - DAY ONLY
WINDII 103/1238 63383 POWER ON
The beta angle ranged between the angles of 23.7 degrees to 48.9
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 70 degrees on 26 April 2003 (DOY 116).
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 1.59 to 1.92 degrees C. Additional
battery performance data for each battery on 11 April and 18 April
2003 are provided in Appendix D.
The clock error ranged from -9.9 to 9.9 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
PEM = 01
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 03
Four (4) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Three (3) 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 preliminary Eclipse build, which was expected on Tuesday, was
delayed due to the status buffer issues. Raytheon requested a new
telemetry capture file to test their functionality. This required
bring up the UARS simulator, which did not work properly on Tuesday.
The simulator was fixed by Thursday afternoon and the data file was
sent to Denver on Friday. The FOT is waiting to hear back from
Denver, as to whether or not the capture file allowed them to test
their new code properly. If not then Denver will send someone out to
Goddard to work with the FOT on testing the status buffer code. In
the meantime the preliminary build is scheduled to come out on Monday,
so that at least the WAIT code can be tested.
UARS experienced some ground system problems this weekend. On
Saturday at approximately 102/1400 GMT, the Eclipse primary
configuration stopped updating telemetry. The workstations were
rebooted and the configurations would not restart. At this point the
offline engineers were notified and the FOD was told to call in the
system administration support. Once the SA arrived, he rebooted the
servers on three different occasions to no avail and finally rebooted
the CISCO switches. The reboot of the switches solved the problem and
the configurations were restored to their nominal state.
Unfortunately, the online crew could not observe the spacecraft until
102/1921 GMT. No data was lost however since PACOR-A has their own
realtime feed.
More network issues were experienced throughout the week, specifically
Tuesday and Friday. All indications lead back to CISCO switch one as
the source of the problem. Eclipse system administrators are still
investigating the problem and may order a replacement switch.
The tape drive, which is used to capture the backups of the Eclipse
system, was also found to be malfunctioning on Tuesday. A new drive
was ordered and installed on Thursday afternoon, but this drive did
not work either. Another new drive was ordered and will be installed
next week.
MEETINGS
The FOT called a meeting on Tuesday to discuss the network issues seen
over the weekend and discuss investigative actions and possible fixes.
The FOT attended the weekly UARS DRB to review the open DRs and
discuss the details of the next Eclipse software delivery
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 16 May 2003 (DOY 136). This
maneuver will be a Forward to Reverse 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 18 April 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63367 102/1158 03-092 PEM POWER ON - DAY ONLY
63383 103/1238 03-093 WINDII POWER ON
63426 106/0911 03-094 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
63445 107/1558 03-095 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 18 April 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 18 April 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63426 106/0917 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
63445 107/1604 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 18 April 2003
11 April 2003 - GMT Day 101 Beta = 19.4 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 -179.2/-212.8 -3.99/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-78.4 +5.15/+3.55 +28.8/-14.4 25.1 1.020 19.5
3 +22.4/-22.4 +3.23/+2.60 +28.0/-14.4 25.1 1.010 19.0
18 April 2003 - GMT Day 108 Beta = 48.9 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 -190.4/-224.0 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-145.6 +5.47/+3.55 +25.2/-15.2 25.4 1.040 20.0
3 +22.4/-44.8 +4.51/+2.92 +24.8/-15.2 25.4 1.030 19.8
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 18 April 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-013 FOT 63368 102/1340 NA Eclipse Network Issues
03-011 FOT 63427 106/1149 30832 Generic Late Acquisition
03-011 FOT 63427 106/1149 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63308 098/1349 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
------ ------ ----- ---- --- -----------------
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-013 FOT 63368 102/1340 NA Eclipse Network Issues
03-011 FOT 63427 106/1149 30832 Generic Late Acquisition
03-011 FOT 63427 106/1149 30832 Generic Late Acquisition