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UARS WEEKLY STATUS REPORT - 22 August 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 O2 occultation scans during periods of UARS telemetry or
periods of onboard tape recording.
The special 0.15 nm resolution scan of the FUV scheduled for early
on Aug. 13, roughly coincident with the U. Colorado EUV rocket
launch, was successful.
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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 09 August 2003 (Orbit 65150, GMT Day 221) through
15 August 2003 (Orbit 65254, GMT Day 227).
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 226/1249 65232 AXIS POWER ON 7-WATTS
PEM 227/1430 65233 AXIS-2 POWER OFF
WINDII 227/1325 65248 POWER ON
The beta angle ranged between the angles of 40.5 degrees to 38.8
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 27 August 2003 (DOY 239).
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 2.56 to 2.90 degrees C. Additional
battery performance data for each battery on 08 August and 15 August
2003 are provided in Appendix D.
The clock error ranged from -09.9 to 10.0 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 = 04
PEM = 02
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 03
Three (3) 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
This week the FOT tested the patch to the Eclipse scripting executable
(CECIL.exe). This patch was developed to eliminate a problem with
WAIT/IF statement logic. During testing the FOT was unable to
reproduce the problem and is working with Denver and onsite Raytheon
support to try to replicate the problem. This problem was found on
the ERBS system and may manifest itself differently on the UARS
network. Once the problem has been replicated on the old executable
the new executable will be tested on the prototype and release to
operations.
On 15 August, the VT-6 charge level was utilized to support the WINDII
turn on. Previous attempts to power WINDII caused an low power
condition which prompted their immediate turn off. VT-6 should give
the batteries the extra power needed to maintain the end of night load
bus voltage. No specific time has been determines as to when the
batteries will be put back to their nominal VT-5 charge level. The
FOT will have to monitor the batteries closely and determine from
telemetry when it is safe to return to VT-5.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 27 August 2003 (DOY 239).
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 15 August 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65150 221/0103 03-206 CADH NOOPS (PBK PASS CHANGED)
65169 222/0826 03-207 OBC CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65188 223/1333 03-208 OBC CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65232 226/1249 03-209 PEM AXIS POWER ON 7-WATTS
65233 226/1430 03-210 PEM AXIS-2 POWER OFF
65247 227/1246 03-211 MPS VT-5 TO VT-6
65248 227/1325 03-212 WINDII POWER ON
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 15 August 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 15 August 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
65169 222/0828 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65188 223/1336 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 15 August 2003
08 August 2003 - GMT Day 220 Beta = 39.5 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/-50.0 07.2 0.000 0.0
2 +11.2/-123.2 +5.47/+4.19 +26.4/-50.0 25.0 1.030 20.0
3 +22.4/-67.2 +4.51/+3.23 +25.6/-50.0 25.0 1.030 20.0
15 August 2003 - GMT Day 227 Beta = 38.8 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 -2.42/-4.31 +00.0/-50.0 07.2 0.000 0.0
2 +11.2/-72.8 +7.09/+4.19 +26.8/-50.0 25.4 1.040 23.0
3 +22.4/-67.2 +5.79/+3.23 +26.4/-50.0 25.4 1.040 22.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
65247 227/1246 LV5 -> LV6
APPENDIX E
UARS ANOMALY REPORTS
Week ending 15 August 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-042 TDW 65186 223/1109 33437 TDW Could not support
03-037 FOT 65227 226/0414 30832 Generic Late Acquisition
03-043 FOT 65238 226/2119 N/A Excessive Data Dropouts
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-038 FOT 65061 215/0304 33390 Degraded data
03-039 FOT 65081 216/1205 N/A PEM AXIS-1 Power ON Problem
03-040 FOT 65099 217/1634 33399 Dropouts / COP status changes
03-041 FOT 65120 219/0110 33410 Negative Acquisition 1KB Omni
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
------ ------ ----- ---- --- -----------------
03-037 FOT See List August 03 30832 Generic Late Acquisition
03-042 TDW 65186 223/1109 33437 TDW Could not support
03-043 FOT 65238 226/2119 N/A Excessive Data Dropouts