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UARS WEEKLY STATUS REPORT - 07 Dec 2001
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Please send future UARS Weekly Status Report submissions to
UMPGAL::STAT or "stat@umpgal.gsfc.nasa.gov"
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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.
We are awaiting the delivery of attitude and orbit files so that
we can process SUSIM data since Nov. 17.
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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 *****
PEM began daylight operations on 2001333 and the PEM/AXIS-1 was also
activated on 2001333.
Verification of PACOR-A files is complete and verified. Binaries were
not the same from PACOR-A as from CDHF so these data files were processed
to science data and the science data was compared. As suspected, the version
number field contained a different value which caused the binaries to differ.
PEM does not use Quicklook data; however, PEM has used NRT data from
the CDHF to verify instrument operations in the past. PEM assumes that NRT
data will no longer be available...(Correct?)
PEM performed tests of NMC data files from both the CDHF and NOAA. NMC
data files from both systems were captured and read. PEM is now capturing
NMC data directly from the NOAA web site. An automated-cron unix c-shell
script is available from PEM if it can be of use to others. For a copy,
contact: rudy@pemrac.space.swri.edu or PEM2K::RUDY.
An outstanding question from PEM is the UARS Orbit and Attitude. Some
discussion has taken place about the UARS ORBIT data but there has been no
indication on how UARS attitude data is being distributed to the
experimenters. In addition, PEM uses UARS OA Services-UOAS extensively and
that software has not been made available. It is unclear as to how attitude
information is to be determined.
*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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HRDI continues to function normally, making wind measurements during
the sunlit parts of orbits nearly every day, and measuring nighttime winds
when power is available.
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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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REPORTING PERIOD
This report covers 24 November 2001 (Orbit 55787, GMT Day 328) through
30 November 2001 (Orbit 55891, GMT Day 334).
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
HRDI 328/1142 55794 TO LOW POWER=09
SUSIM 3239/2259 55816 Power OFF=09
SUSIM 332/1445 55856 Power ON (PART-1)=09
PEM 333/1124 55869 Power ON DAY ONLY=09
AXIS-1 333/1304 55870 Power ON (7 WATTS)=09
SUSIM 333/1444 55871 Power ON COMPLETED=09
A Reverse-to-Forward Yaw Around maneuver (number 104) was successfully
executed in Orbit 55375 beginning 330/14:04:41 and completing at
330/14:41:51 on 26 November 2001. The SOLSTICE instrument was in day
only and all other instruments were in their off or standby mode
(including HRDI and PEM). Due to the SA position at 269 degrees, the
effective night length of the spacecraft after the maneuver was
approximately 57.1 minutes. Post maneuver analysis of data indicate
that during the Yaw Around, the end-of-night load bus voltage was 23.8
volts and the average depths of discharge (DODs) on Batteries 2 and 3
were approximately 20.4 and 20.2 percent respectively. The next
(reverse-to-forward) YAW is scheduled for 25 December 2001 (DOY 359).
The beta angle ranged between the angles of 10.3 degrees to 12.6 degrees
for this report period. The beta angle is now increasing towards a
maximum angle of 34 degrees on 11 December 2001 (DOY 345).
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 1.3 to 1.9 degrees C. Additional
battery performance data for each battery on 23 November 2001 and 30
November 2001 are provided in Appendix D.
The clock error ranged from -10.7 to 11.8 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 =3D 00
ALERTS =3D 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT =3D 8
HRDI =3D 1
SUSIM =3D 3
PEM =3D 1
AXIS-1 =3D 1
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
None this report period.
Zero (0) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
* Transponder A: 00/316 - 2287.496493
* Transponder B: 01/286 - 2287.498613
GROUND SYSTEM OPERATION
Zero (0) 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). This service should resume soon.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The Raytheon development team for the Eclipse system presented the
System Design Review (SDR) this week in Landover, MD. The meeting went
very well and the smoothness of this review showed the progress being
made by all parties involved. The Eclipse team is scheduled to supply
the first release of the system in January, which will begin the testing
processing.
The FOT held the Operational Readiness Review (ORR) for the TAC
replacement system this week. The ORR was held with a lien on the two
outstanding DRs, which should be fixed soon. It was decided after this
presentation that the TACs would be used for operations during the day
shift timeframe for approximately the next two weeks before being
released to operations full time.
MEETINGS
The FOT attended a UARS Eclipse Weekly on Monday, November 26, 2001.
The FOT attended a UARS Eclipse SDR on Wednesday, November 28, 2001.
The FOT attended a UARS Eclipse-FDF Meeting on Thursday, November 29,
2001.
The FOT attended a UARS Eclipse-TAC RS Meeting on Thursday, November 29,
2001.
The FOT attended a UARS TAC-RS ORR on Thursday, November 29, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 25 December 2001 (DOY 330).
This maneuver will be a Forward to Reverse Flight maneuver (Northern
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 30 November 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
55794 328/1142 01-690 HRDI TO LOW POWER
55797 328/1640 01-691 OBC/CLK Clk Adj -20.6 to 0.00 msec/day
55816 329/2259 01-692 SOLSTICE TO DAY-ONLY MODE
55816 3239/2259 01-693 SUSIM Power OFF
55825 330/1321 01-694 MACS YAW SCRIPT (MONYAW)
55825 330/1321 01-695 TAM OUT OF UPDATE MODE
55826 330/1446 01-694 MACS MACS SFHLD TO FWD DIR.
55826 330/1446 01/696 TAM ALIGNMENT/TO UPDATE MODE
55854 332/1222 01-698 NBTR PBK & RTS-58
55856 332/1445 01-699 SUSIM Power ON (PART-1)
55869 333/1124 01-700 PEM Power ON DAY ONLY
55870 333/1304 01-701 AXIS-1 Power ON (7 WATTS)
55871 333/1444 01-699 SUSIM Power ON COMPLETED
55871 333/1444 01-702 XMTR XMTR-A ON (for OMNI pass)
55871 333/1602 01-702 XMTR XMTR-A OFF / TEST CMDS
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 30 November 2001
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 30 November 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
55797 328/1658 Clk Adj -20.6 to 0.00 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 30 November 2001
23 November 2001 - GMT Day 327 Beta =3D 13.9 deg, SA Pos =3D 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 +728.0/+728.0 -3.77/-4.69 +0.0/ -0.0 10.7 0.000 0.0
2 +00.0/ -33.6 +4.48/+4.17 +28.8/-13.6 26.2 1.030 19.1
3 +22.4/ -22.4 +3.17/+2.20 +28.0/-13.6 26.2 1.030 18.6
30 November 2001 - GMT Day 334 Beta =3D 12.6 deg, SA Pos =3D 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 +728.0/+728.0 -4.08/-4.99 +0.0/ -0.0 10.7 0.000 0.0
2 +00.0/ -33.6 +4.48/+3.17 +29.6/-13.2 26.4 1.030 19.5
3 +22.4/ -22.4 +3.17/+2.20 +28.4/-13.2 26.4 1.020 19.0
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 30 November 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-69 FOT see list Nov 01 14170 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
-None this report period.
SEVNTFW01/48