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UARS WEEKLY STATUS REPORT - 20 June 2003
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SOLSTICE
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For three days this week, SOLSTICE was powered only during daylight to
support the yaw maneuver. Otherwise, solar data were collected on all
available orbital tracking periods.
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SUSIM
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SUSIM was powered off June 14-17. Otherwise, the instrument
has successfully gathered all of its daily mid resolution,
weekly offset, and O2 occultation scans this past week during
periods of UARS telemetry or during 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 07 June 2003 (Orbit 64202, GMT Day 158) through 13
June 2003 (Orbit 64307, GMT Day 164).
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 AXIS 160/0138 64233 POWER OFF
HALOE 161/0135 64248 POWER OFF
PEM 163/2242 64306 POWER OFF
SUSIM 164/2205 64306 POWER OFF
SOLSTICE 164/2239 64306 POWER OFF
The beta angle ranged between the angles of 25.8 degrees to 7.9
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 14 June 2003 (DOY 165).
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 06 June and 13 June 2003
are provided in Appendix D.
The clock error ranged from 10.3 to 10.7 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
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
The new build of Eclipse software (Build 2.0.2) was delivered to the
prototype system on 29 May 2003. FOT testing of this build began on
30 May 2003 and continued throughout this week. Once testing has been
completed some parallel operations will be run before the build is
released for operations.
MEETINGS
The FOT also attended the weekly UARS DRB on 10 June 2003, to review
the open DRs and discuss the testing status of the new Eclipse
software delivery.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 14 June 2003 (DOY 165). 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 13 June 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
64233 160/0138 03-138 PEM AXIS POWER OFF
64248 161/0135 03-139 HALOE POWER OFF
64261 161/2212 03-140 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64280 163/0446 03-141 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64292 163/2242 03-142 PEM POWER OFF
64306 164/2205 03-143 SUSIM POWER OFF
64306 164/2239 03-144 SOLSTICE DAY-ONLY OPS
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 13 June 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 13 June 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period.
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 13 June 2003
06 June 2003 - GMT Day 157 Beta = 28.3 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/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +00.0/-179.2 +5.47/+4.51 +27.2/-14.8 24.5 1.030 20.5
3 +16.8/-67.2 +4.51/+3.23 +26.4/-14.4 24.3 1.020 20.3
13 June 2003 - GMT Day 164 Beta = 7.9 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 -700.0/-700.0 -3.68/-4.62 +00.0/-50.0 07.2 0.000 0.0
2 +11.2/-95.2 +5.47/+4.51 +26.4/-50.0 23.8 1.020 21.0
3 +22.4/-67.2 +4.51/+3.23 +25.6/-50.0 23.8 1.010 20.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 13 June 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-028 FOT 64273 162/1731 32952 Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-028 FOT 64273 162/1731 32952 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
------ ------ ----- ---- --- -----------------
03-027 FOT See List June 03 30832 Generic Late Acquisition
03-028 FOT 64273 162/1731 32952 Late Acquisition