UARS Weekly Status Report

28 November 1997





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                UARS WEEKLY STATUS REPORT - 28 November 1997

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***********
SOLSTICE
***********

SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.

Happy Thanksgiving!

***********
SUSIM
***********

Nothing received.

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PEM
***********

Nothing received.

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HALOE 
***********

Nothing received.

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MLS
***********

Nothing received.

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HRDI
***********

Nothing received.

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WINDII
***********

Nothing received.

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MPG
***********

Routine processing of instrument Daily Activity Plans continues
with no problems.  The MPG continues to assist the Project
Scientist with the scheduling of instrument operations.

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CDHF
***********

UARS CDHF Status Week Ending Nov 28, 1997
-----------------------------------------
The CDHF has received a total of 349 CD-ROM requests as of
28 November 97. Three new CD-ROM orders were received and shipped this week.    

The CDHF has successfully loaded the September 1997 DAAC data into the
DAAC Transfer Tables.

The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
   (C) = Complete, (F)= Failed  (L) = Days remaining to reprocess.           
                   1 day SOLSTICE (4.52) Prod 1R-1C=0L)
		   1 day SUSIM (6.3) Prod (1R-1C=0L)
                  20 days PEM (3.32) Prod (1350R-610C=740L)
                   3 days MLS (4.90) Eng (43R-43C=0L)
                             
Pending CDHF software upgrades include IDL 5.0 and OpenIngres 2.0.
                  
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FOT
***********

REPORTING PERIOD

This report covers 14 November 1997 (Orbit 33757, GMT Day 318) through 21 
November 1997 (Orbit 33863, GMT Day 325).


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
     HRDI      323/2135     33832     Off, low
     HALOE     323/2316     33833     Off
     PEM       324/1502     33842     ZEPS on
     MLS       324/2139     33847     On
     PEM       325/0525     33851     Start HEPS on
     PEM       325/1820     33859     Complete HEPS on
     HRDI      317/0623     33732     On

The beta angle is now increasing toward a maximum angle of 78.1 degrees on 
27 November 1997 (DOY 331).

Solar Stellar Pointing Platform (SSPP) special Solar tracking experiments 
as requested by SOLSTICE were performed on Day 321 and Day 324.  The 
experiment (which has been performed earlier this year) involved commanding 
the SSPP to point to a particular Right Ascension and Declination, instead 
of using the Solar ephemeris to track the Sun.  All of the pointing times 
and angles were calculated by SOLSTICE operations and confirmed by the FOT.


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 24.2 end-of-night (EON) load bus voltage.  Battery 
temperatures are stable with a temperature delta between Battery 2 and 
Battery 3 of 1.2 degrees C.  Additional battery performance data for each 
battery on 14 November 1997 and 21 November 1997 are provided in Appendix 
D.

The clock error ranged from -10.2 to +12.6 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.

%     ALERTS            =     00
%     OUT-OF-LIMITS     =     11

The following real-time command sheets were executed for the listed 
operational element(s) during this report period (see Appendix A). 

%     FOT     04
%     HRDI    02
%     HALOE   01
%     MLS     01
%     PEM     07

UARS Anomaly Reports initiated during this report period are listed in 
Appendix E and summarized below.

%     FOT     00

TRANSPONDER FREQUENCIES:
     Transponder A:  97/301 - 2287.497086
     Transponder B:  97/302 - 2287.499098



GROUND SYSTEM OPERATION

No (0) operational support problem(s) occurred this period. Anomaly Reports 
are included in Appendix E.

The data loss calculations supplied by Data Capture Facility (DCF) from 
mission start through UTC Day 97/324 show the observatory data loss to be 
20 hours, 41 minutes, 02.292 seconds (an increase of 2.144 seconds).  This 
is a 0.0383 percent data loss which equals a 99.9617 percent data capture 
for the mission.

The increase of 2.144 seconds occurred on Day 322 and was due to line 
problems.

The scheduled MLS ON time became a point of confusion this week when the 
schedule identified operational start at the beginning of Day 325 when in 
fact, MLS was not warm enough for operation until 1800 UTC of Day 325.  The 
scheduling inconsistency is being investigated.

FOT successfully completed an operational readiness verification of the 
MSOCC playback capture and replay capability.  This test was conducted to 
authenticate the process as a possible backup capability during the 
Building 23 power outage scheduled early 1998.  Playback data in Orbit 
33812 (322/1311) was downlinked to MSOCC RUPS in addition to TIPIT.  The 
first 10 minutes of the MSOCC recorded data was replayed through the 
Application Processor (AP) at realtime rate and verified by Flight 
Operations.

User Planning System (UPS) software Release 11, Build 2 was promoted to 
operations this week.  Prior notification for this software change was 
somewhat lacking.  The promotion of the software was hampered by some 
configuration problems, which were eventually corrected by the UPS system 
manager.  In addition, the new software contains a few problems regarding 
report generation, but nothing that adversely impacts the normal operations 
of the FOT.

The FOT is still working out the details of participating in the IP return-
link telemetry test that the network is conducting. The FOT plans to be 
participating in the test by no later than 01 December 1997.


Flight Dynamics Facility (FDF) continues the generation process for a new 
Star Catalog to fix the invalid precession rate for star 48000001.

The Replacement Level Zero Processor (LZPR) was successfully elevated to 
operational status on 15 November 1997.

No testing of the new CMS software release (R7B1V2) occurred this week.

Investigation of the stored command verification problem - time to complete 
- associated with Applications Processor (AP) software release 10.08 
continued.  The cause has been identified, but rectifying the problem 
continues.


OTHER SIGNIFICANT EVENTS

Monitoring of the magnetic field model performance continues.

FOT continues to improve a Power Profile for UARS based on the current 
status of the Modular Power System.

FOT continues to support the new UARS ground system re-engineering effort.


MEETINGS

No UARS Battery telecon was held this week.  The next telecon has not been 
scheduled.


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver is currently scheduled for 17 December 
1997 at 311/132708.

The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust 
will probably be required in mid-1998.



FACILITIES

no change


PERSONNEL CHANGES

None


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 21 November 1997

ORBIT       AOS          NO.    SUBSYS           REASON
-----       ---         ---     ------           -------  
33775     320/0312     97-570   OBC/CLK   Clk Adj fr 0.00 to 20.6
                                          msec/day
33832     323/2135     97-571     HRDI    "Power OFF, low "
33832     323/2135     97-572     HRDI    Heater delay to 25 amp. mins
33832     323/2135     97-573     OBC     Clk Adj fr 20.6 to 0.00 msec/day
33833     323/2316     97-574    HALOE    Power OFF
33842     324/1502     97-575     PEM     Power ON  ZEPS
33847     324/2139     97-576     MLS     Power ON
33849     325/0151     97-577     OBC/    Power Off HEPS 1 & 2
33852     325/0708     97-579     PEM     Turned on HEPS--Low Voltage
33853     325/0855     97-580     PEM     HEPS to High Voltage
33855     325/1121     97-581     PEM     HEPS to Level 2
33858     325/1650     97-582     PEM     HEPS to Level 4
33859     325/1820     97-583     PEM     HEPS to Level 5
33861     325/2005     97-584   OBC/CLK   Clk Adj fr 20.6 to 41.2 msec/day


_______________________________________________________________

APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 21 November 1997

MNEMONIC      STATE           DESCRIPTION                ORBITS
---------     -----           ------------               ------
OBSBATVEON2   Y-LO     Battery 2 voltage at EON   33763-67,76-810
OBSBATVEON2   R-LO     Battery 2 voltage at EON   33759-62,68-71,75-76
OBSBATVEON3   Y-LO     Battery 3 voltage at EON   33759-67,76-810,21-2
OBSBATVEON3   R-LO     Battery 3 voltage at EON   33759-62,68-71,75-77
OBSVLBEON     Y-LO     Load Bus Volts at EON      33763-67,72-74,78-
                                                  810,18,21-2
HATBAT        Y-HI     HALOE Bolometer area temp  33831
OBSSOC2       Y-LO     Battery 2 Current SOC      33759-33863
HRIFESURVTMP  Y-HI     HRDI IFE Survival Temp.    33834-37
HRRADTEMP     Y-HI     HRDI Radiometer Temp.      33834
SOSGTEVLTG    Y-HI     SOLSTICE G-Tube Voltage    33759
OBSVLBEON     R-LO     Load Bus Volts at EON      33759-62,75-77


The following ALERT occurrences were detected:

MNEMONIC                     DESCRIPTION                 ORBITS
---------                    ------------                ------
          None this report period



                                APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                       Week ending 21 November 1997

                       CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT              TIME                 CLOCK RATE CHANGE
     -----              ----                 -----------------
     33775     320/03:13 (16 Nov 97)     from 00.0 to 20.6 msec/day
     33832     323/21:43 (19 Nov 97)     from 20.6 to 00.0 msec/day
     33849     325/01:58 (21 Nov 97)     from 00.0 to 20.6 msec/day
     33861     325/20:14 (21 Nov 97)     from 20.6 to 41.2 msec/day


_______________________________________________________________

                             APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                       Week ending 21 November 1997

     15 Nov 1997 - GMT Day 319 Beta = 34.9 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   +728.0/+728.0  -2.80/-3.58   +0.0/ +0.0    18.7    0.000     0.0
2    +22.4/ -33.6  +7.74/+6.07  +30.2/-16.6    24.2    1.020    24.4
3    +28.0/ -22.4  +6.44/+4.83  +29.0/-16.2    24.2    1.022    23.4

     21 Nov 1997 - GMT Day 325 Beta = 60.6 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  +728.0/+728.0  -2.94/-3.68   +0.0/ +0.0     18.7    0.000    0.0
2   +11.2/ -28.0  +5.47/+3.87  +24.1/-16.1     25.4    1.019   21.8
3   +56.0/ -11.2  +4.25/+2.80  +23.0/-15.9     25.4    1.020   20.9


     V/T LEVEL CHANGES
ORB#     TIME     LVL FR-TO
-----  --------  ----------
      no changes     
               

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                                   APPENDIX E
                              UARS ANOMALY REPORTS
                            Week ending 21 November 1997

  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
  ------   ------       -----      ----       ---      -----------------
97-121     FOT         33757   318/21:37     GRD      ERR SOL LD


               ANOMALY INVESTIGATION REPORTS GENERATED
  AIR NO.  SUBSYS       ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  -------  ------       -----      ----       ---      -----------------
     None this report period