UARS Weekly Status Report

15 September 2000




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                UARS WEEKLY STATUS REPORT - 15 SEP 2000

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Note: Due to the network problems experienced by Goddard Space Flight Center
      on Friday September 15, 2000 the transmission of the "UARS Status Report"
      was not possible. We apologize for the inconvenience.


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

SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Our solar data is not affected by the larger than normal pointing errors
(2-4 arcminutes across a track) since they are within our calibrations.

Additionally, we continue to gather enough data to meet all the SOLSTICE
science objectives during this period of reduced tape recorder operations.
Level2 processing is halted due to bugs in the OA_SSPP_ATT service. CDHF
and CSC personnel are working on the problem.

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

SUSIM continues to gather a normal set of daily solar scans
scheduled for periods of predicted telemetry.

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ACRIM
***********

Nothing received.

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

Nothing received.

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

Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinate with the Flight
Operations Team and to assist the Project Scientist in the
scheduling of instrument operations.

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

Nothing received.
                  
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FOT
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                              REPORTING PERIOD

This report covers 02 September 2000 (Orbit 49067, GMT Day 246) through 08 
September 2000 (Orbit 49171, GMT Day 252).

                           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              250/2342     49141        POWER OFF AXIS 1,2
     WINDI            251/0123     49141        POWER ON

The beta angle ranged between the angles of 48.3 degrees to 36.1 degrees for 
this report period.  The beta angle is now decreasing toward a minimum angle of 
+0 degrees on 18 September 2000 (DOY 262).

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 to 0.8 degrees C.  Additional battery performance data for each 
battery on 01 September 2000 and 08 September 2000 are provided in Appendix D.

The clock error ranged from -12.3 to 10.3 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            =  44
¥     WINDII         =  02

UARS Anomaly Reports initiated during this report period are listed in Appendix 
E and summarized below.
¥     FOT            =  01

Three (3) Anomaly Reports remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
· Transponder A:  00/153  -  2287.496961
· Transponder B:  00/213  -  2287.499288


                         GROUND SYSTEM OPERATION

One (1) operational support problem 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 00/251 show the observatory data loss to be 298 hours, 13 
minutes, 25.960 seconds (an increase of 25.960 seconds since the last report 
period).  This is a 0.39 percent data loss which equals a 99.61 percent data 
capture for the mission.

The increase of 25.960 seconds occurred over one (1) day:

· 25.960 seconds on Day 245 due to a data hit.

                       OTHER SIGNIFICANT EVENTS

                       UARS SATELLITE OPERATIONS

The FOT continues to operate FHST-1 for approximately one orbit each day.  By 
cycling the tracker on and off for such a short duration the degradation seems 
to have been reduced.  Scale factor calibrations are being provided on a 
regular basis from FDF and are being uplinked when received.  It appears that 
the FOT has been able to stabilize the performance of FHST-1 for now and 
continues to work on establishing another viable attitude control solution 
should the tracker fail.

                               MEETINGS

None this report period.


                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for September 17, 2000 (DOY 261).  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 08 Sept 2000

ORBIT     AOS          NO.       SUBSYS      REASON
-----     ---          ---        ------     -------
49070     246/0612     00-456     NBTR       NOOPS D246
49073     246/1127     00-456     NBTR       NOOPS D246
49076     246/1636     00-422     FHST1      POWER ON
49077     246/1816     00-422     FHST1      POWER OFF
49077     246/1816     00-457     NBTR       NOOPS D247
49084     247/0437     00-457     NBTR       NOOPS D247
49086     247/0756     00-458     OBC        Clk Adj 20.6 to 0.00 msec/day
49091     247/1538     00-422     FHST1      POWER ON
49091     247/1637     00-457     NBTR       NOOPS D247
49092     247/1720     00-422     FHST1      POWER OFF
49092     247/1818     00-459     NBTR       NOOPS D248
49100     248/0615     00-459     NBTR       NOOPS D248
49106     248/1540     00-422     FHST1      POWER ON
49106     248/1639     00-459     NBTR       NOOPS D248
49107     248/1721     00-422     FHST1      POWER OFF
49107     248/1820     00-460     NBTR       NOOPS D249
49114     249/0439     00-460     NBTR       NOOPS D249
49121     249/1542     00-422     FHST1      POWER ON
49121     249/1641     00-460     NBTR       NOOPS D249
49122     249/1723     00-422     FHST1      POWER OFF
49123     249/1822     00-461     NBTR       NOOPS D250
49124     249/2005     00-462     FHST1      SCALE FACTOR UPDATE
49128     250/0301     00-463     OBC        Clk Adj 0.00 to 20.6 msec/day
49129     250/0521     00-461     NBTR       NOOPS D250
49136     250/1544     00-422     FHST1      POWER ON
49136     250/1642     00-461     NBTR       NOOPS D250
49137     250/1725     00-422     FHST1      POWER OFF
49138     250/1824     00-463     NBTR       NOOPS D251
49138     250/1904     00-465     FHST1      SCALE FACTOR UPDATE
49139     250/2008     00-466     OBC        TABLE 15 UPDATE
49141     250/2342     00-467     PEM        POWER OFF AXIS 1,2
49141     251/0123     00-468     WINDII     POWER ON
49144     251/0524     00-463     NBTR       NOOPS D251
49147     251/0955     00-469     WINDII     WINDII ERROR FIX
49151     251/1546     00-422     FHST1      POWER ON
49151     251/1546     00-470     OBC        Clk Adj 20.6 to 0.00 msec/day
49151     251/1644     00-464     NBTR       NOOPS D251
49153     251/1826     00-422     FHST1      POWER OFF
49153     251/1826     00-471     NBTR       NOOPS D252
49159     252/0442     00-471     NBTR       NOOPS D252
49159     252/0527     00-471     NBTR       PLAYBACK
49166     252/1548     00-422     FHST1      POWER ON
49166     252/1646     00-471     NBTR       NOOPS D252
49167     252/1728     00-422     FHST1      POWER OFF
49168     252/1828     00-472     NBTR       NOOPS D253
49168     252/1905     00-473     FHST1      SCALE FACTOR UPDATE
49062     245/1814     00-456     NBTR       NOOPS D-24
_________________________________________________________________________

                               APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 08 Sept 2000

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 08 Sept 2000

                      CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME                        CLOCK RATE CHANGE
-----     ----                        -----------------
49086     247/0756 (03 September)     from 20.6 to 0.00 msec/day
49128     250/0301 (06 September)     from 0.00 to 20.6 msec/day
49151     251/1612 (07 September)     from 20.6 to 0.00 msec/day
___________________________________________________________________________

                              APPENDIX D
                   UARS BATTERY PERFORMANCE DATA
                      Week ending 08 Sept 2000


     01 Sept 2000 - GMT Day 245 Beta = 48.3 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    +728.0/+728.0  -3.05/-4.31  +0.0/+0.0     14.4     0.000     0.0
2    +44.8/-11.2    +5.15/+3.87  +26.0/-15.2   25.0     1.040     19.8
3    +22.4/-33.6    +4.19/+2.92  +25.6/-15.2   25.0     1.038     19.7


     08 Aug 2000 - GMT Day 252 Beta = 36.1 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  -3.05/-4.31  +0.0/+0.0     14.4     0.000     0.0
2   +67.2/-16.8    +5.79/+4.51  +28.4/-15.2   24.3     1.040     21.5
3   +22.4/-56.0    +5.15/+3.87  +28.0/-16.0   24.2     1.038     21.0


     V/T LEVEL CHANGES
ORB#       TIME             LVL FR-TO
-----      ----------       ----------
           no changes       V/T 5
______________________________________________________________________________

                               APPENDIX E
                          UARS ANOMALY REPORTS
                        Week ending 08 Sept 2000

                     NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
------     ------     -----     ----        ---     -----------------
00-041     OBC        49153     251/1826    14170   Generic Late Acq.


                  ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
------     ------     -----     ----        ---     -----------------
00-037     FOT        see list  Aug 00      14170   Generic Late Acq.

                 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
------     ------     -----     ----        ---     -----------------
00-041     FOT        see list  Sept 00     14170   Generic Late Acq.
00-040     FOT        48854     231/2111    22831   Data Dropout
00-032     FHST       48211     188/2242    N/A     FHST 2 Anomaly


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