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UARS WEEKLY STATUS REPORT - 16 Nov 2001
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Since the CDHF system will not be available after November 30, 2001,
we will move the UARS Weekly Status Reports to the UMPGAL system.
After November 30, please address input for these weekly reports to
"stat@umpgal.gsfc.nasa.gov". (The DECNET address "UMPGAL::STAT"
may also work, but the future availability of DECNET is uncertain.)
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SOLSTICE
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SOLSTICE continues normal operations, taking solar data on all available
orbital tracking periods and stellar calibration observations whenever
possible. We continue to gather enough data to meet the SOLSTICE science
objectives during this period of reduced tape recorder operations.
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SUSIM
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SUSIM completed daily mid resolution and MgII solar scans
during periods of predicted UARS telemetry.
SUSIM has made special plans for the upcoming Leonid shower other
than remain idle during the predicted peak.
We continue work on the remaining software components that will allow
the processing of the SUSIM data from level 1 to level 3 on the SUSIM
RAC.
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ACRIM
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Nothing received.
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PEM
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***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****
The PEM boom instruments were activated on 2001303 at about 22 UT in
full operational mode.
Verification of PACOR-A files is preceding. Binaries were not the same
from PACOR-A as from CDHF. It is suspected that the version number field
contains a different value and this is causing the binaries to differ. Science
data values are now being compared.
*Beginning of power orbit day (PEM activation): array current >5 amps, array
voltage >53.5 volts, and battery current >2.0 amps.
End of power orbit day (PEM deactivation): time in power orbit day >4 minutes,
array current <9 amps, and battery currents <0.2 amps.
Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta.
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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 to support re-engineering
of the UARS Mission Operations Concept to develop
capabilities for the Science Traceability Mission.
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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FOT STATUS REPORT FOR WEEK ENDING 09 NOVEMBER 2001
NOTE: EFFECTIVE THE END OF NOVEMBER 2001 THE METHOD FOR DISTRIBUTION
OF THE WEEKLY UARS FOT STATUS REPORT WILL CHANGE WITH THE CLOSING OF
THE UARS CDHF. IF YOU STILL WISH TO BE ON DISTRIBUTION FOR THE UARS
FOT WEEKLY STATUS REPORT AFTER 1 DECEMBER 2001 PLEASE SEND A
CONFIRMATION EMAIL REQUESTION THAT YOU BE KEPT ON DISTRIBUTION TO
RREDDING@POP400.GSFC.NASA.GOV, SUBJECT LINE SHOULD BE "CONTINUE TO
SEND UARS FOT WEEKLY STATUS REPORT." THANK YOU
REPORTING PERIOD
This report covers 03 November 2001 (Orbit 55472, GMT Day 307) through 09
November 2001 (Orbit 55576, GMT Day 313).
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
WINDII 312/0047 55547 Power OFF
The beta angle ranged between the angles of -68.0 degrees decreasing and Ð68.0
degrees increasing for this report period. The beta angle is now increasing
towards a maximum angle of -2 degrees on 26 November 2001 (DOY 330).
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 23.8 V end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and Battery
3 of 0.6 and 0.9 degrees C. Additional battery performance data for each
battery on 03 November 2001 and 09 November 2001 are provided in Appendix D.
The clock error ranged from Ð11.8 to 11.2 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 = 02
¥ ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
¥ FOT = 3
¥ WINDII = 1
¥ HRDI = 2
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).
TRANSPONDER FREQUENCIES:
á Transponder A: 00/316 - 2287.496493
á Transponder B: 01/286 - 2287.498613
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). This service should resume soon.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT and software developers located the cause the problems on the new TAC
system. A temporary patch was installed for testing. Testing showed that the
patch resolved the urgent DRs. The TAC developers are now in the process of
fixing the software permanently and will delivery a new release sometime early
next week. This should allow the new TACs to go to ORR and subsequently
released for operations.
The FOT attended the Raytheon Eclipse SRR this week. The requirements review
went very well, many pertinent issues were discussed and some resolved. The
SDR is scheduled for the end of the month, however due to time constraints the
software developers will begin coding next week. The FOT would like to thank
all those in attendance and the Raytheon developers for such a successful
review.
MEETINGS
The FOT attended a UARS FOT Meeting on Monday, November 05, 2001.
The FOT attended a Raytheon Eclipse SRR on Wednesday, November 07, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 26 November 2001 (DOY 330). This
maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere
viewing).
Attachments: Appendix A, Real-time Commands 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 09 November 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
55476 307/0812 01-661 HRDI Safehold - Bar Tmp = 42.39
55481 307/1617 01-661 HRDI HRDI MICROLOAD
55496 308/1435 01-662 OBC Clk Adj fr 41.2 to 20.6 msec/day
55521 310/0726 01-663 OBC Clk Adj fr 20.6 to 41.2 msec/day
55547 312/0047 01-664 WINDII Power OFF
55556 312/1507 01-665 OBC Clk Adj fr 41.2 to 20.6 msec/day
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 09 November 2001
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
HRPTSBARTEMP Y-LO HRDI PTS Barrel Temp 55473-5,77
HRPTSBARTEMP R-LO HRDI PTS Barrel Temp 55476
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 09 November 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
55496 308/1437 Clk Adj fr 41.2 to 20.6 msec/day
55521 310/0730 Clk Adj fr 20.6 to 41.2 msec/day
55556 312/1507 Clk Adj fr 41.2 to 20.6 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 09 November 2001
03 November 2001 - GMT Day 307 Beta = -68.0 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 +00.0/-22.4 -3.05/-4.62 +0.0/+0.0 13.0 0.000 0.0
2 +11.2/-22.4 +4.51/+3.23 +27.2/-13.6 26.4 1.030 19.5
3 +22.4/-22.4 +3.87/+2.60 +26.4/-13.6 26.2 1.030 19.5
09 November 2001 - GMT Day 313 Beta = -68.0 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 +16.8/+00.0 -3.68/-4.62 +0.0/+0.0 13.0 0.000 0.0
2 +16.8/-44.8 +5.15/+3.87 +26.8/-15.2 25.1 1.030 20.5
3 +22.4/-67.2 +4.51/+2.92 +26.4/-15.2 25.1 1.020 20.2
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 09 November 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-071 FOT 55515 309/2112 Data Dropout
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-071 FOT 55515 309/2112 Data Dropout
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-69 FOT see list Nov 01 14170 Generic Late Acquisition
SEVNTFW01/45