UARS Weekly Status Report

22 June 2001




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                UARS WEEKLY STATUS REPORT - 22 Jun 2001

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

Other than being turned off for a few hours yesterday (01172) due to the
solar eclipse low power situation, SOLSTICE continues to operate normally,
taking solar data on all available orbital tracking periods and stellar
calibration observations whenever possible. We continue to gather enough
data to meet all the SOLSTICE science objectives during this period of
reduced tape recorder operations.

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

On Thursday, June 21, SUSIM was switched off when a UARS TMON tripped.
The instrument was switched back on before the end of the day. 
Otherwise, SUSIM completed its daily solar scans during this past week
during periods of predicted UARS telemetry.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

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.

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

Nothing received.

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

Daily processing of instrument Daily Activity Plans continues 
with no problems.

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

Nothing received.
                  
***********
FOT
***********

                           REPORTING PERIOD

This report covers 09 June 2001 (Orbit 53266, GMT Day 160) through 15 June 2001 
(Orbit 53370, GMT Day 166).

                        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       166/1315     53364     Power On


The beta angle ranged between the angles of 30.8 degrees to 33.4 degrees for 
this report period.  The beta angle is now decreasing towards a minimum angle 
of 2 degrees on 28 June 2001 (DOY 179).

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 1.6 to 1.9 degrees C.  Additional battery performance data for each 
battery on 8 June 2001 and 15 June 2001 are provided in Appendix D.

The clock error ranged from Ð12.0 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.

¥     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            =  24
¥     WINDII         =  03

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

¥     FOT            =  03

Four (4) Anomaly Reports remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
· Transponder A:  00/316  - 2287.496493
· Transponder B:  01/119  - 2287.499116

                     GROUND SYSTEM OPERATION

Three (3) operational support problems 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 01/158 show the observatory data loss to be 301 hours, 02 
minutes, 12.728 seconds. This shows zero loss since the last report period. 
This is a 0.39 percent data loss, which equals a 99.61 percent data capture for 
the mission.

                    OTHER SIGNIFICANT EVENTS

                    UARS SATELLITE OPERATIONS

The FOT continues to fine-tune the TAM alignment by loading new alignment 
matrices. A new alignment is required for the reverse flight direction.  This 
is a slow process and it will take many alignments to lock in on the most 
accurate solution.

An instrument anomaly was experienced on 05 May 2001.  The instrument involved 
was the ACRIM II instrument.  All ACRIM telemetry for currents and voltages all 
dropped to zero values suddenly.  The ACRIM team in coordination with the 
UARSFOT is conducting analysis and command tests to determine the cause of the 
anomaly.  Preliminary analysis shows that the anomaly was caused due to failed 
circuitry in the ACRIM electronics box.  The FOT is awaiting a future plan of 
action from the ACRIM team.

                             MEETINGS

The FOT attended a UARS FS CCB Meeting on Monday, June 11, 2001.
The FOT attended a UARS TAC RS Meeting on Wednesday, June 13, 2001.

                     FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 28 June 2001 (DOY 179).  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 15 June 2001

ORBIT     AOS          NO.        SUBSYS    REASON
-----     ---          ---        ------    ------
53268     160/0357     01-377     OBC       Clk Adj 20.6 to 0.0 msec/day
53269     160/0615     01-376     NBTR      NOOPS D-160
53277     160/1819     01-378     NBTR      NOOPS D-161
53281     161/0041     01-379     OBC       Clk Adj 0.0 to -20.6 msec/day
53284     161/0538     01-378     NBTR      NOOPS D-161
53292     161/1919     01-380     NBTR      NOOPS D-162
53293     161/2100     01-381     OBC       Clk Adj -20.6 to 0.0 msec/day
53297     162/0216     01-382     OBC       Clk Adj 0.0 to 20.6 msec/day
53299     162/0539     01-380     NBTR      NOOPS D-162
53303     162/1306     01-383     TAM/OBC   TAM Alignment
53307     162/1821     01-384     NBTR      NOOPS D-163
53314     163/0539     01-384     NBTR      NOOPS D-163
53319     163/1041     01-385     OBC/CLK   Clk Adj 20.6 to 0.0 msec/day
53329     164/0540     01-386     NBTR      NOOPS D-164
53332     164/1122     01-386     NBTR      PLAYBACK / RTS-58
53336     164/1740     01-386     NBTR      NOOPS D-164
53337     164/1822     01-387     NBTR      NOOPS D-165
53339     164/2101     01-388     OBC       TABLE 65 (STAR CATALOG)
53344     165/0540     01-387     NBTR      NOOPS D-165
53351     165/1641     01-387     NBTR      NOOPS D-165
53352     165/1823     01-389     NBTR      NOOPS D-166
53358     166/0439     01-389     NBTR      NOOPS D166
53364     166/1315     01-390     WINDII    Power On
53365     166/1507     01-391     WINDII    DAY 166 MICROLOAD AS REQUESTED
53366     166/1741     01-389     NBTR      NOOPS D-166
53367     166/1823     01-393     NBTR      NOOPS D-167
53367     166/1921     01-394     WINDII    Reload instrument
_______________________________________________________________________________

                             APPENDIX B
               OUT-OF-LIMITS & ALERTS OCCURRENCES
                    Week ending 15 June 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 15 June 2001

                    CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME         CLOCK RATE CHANGE
-----     -----        -----------------
53268     160/0401     Clk Adj 20.6 to 0.0 msec/day
53281     161/0044     Clk Adj 0.0 to -20.6 msec/day
53293     161/2104     Clk Adj -20.6 to 0.0 msec/day
53297     162/0232     Clk Adj 0.0 to 20.6 msec/day
53319     163/1050     Clk Adj 20.6 to 0.0 msec/day
___________________________________________________________________________

                          APPENDIX D
               UARS BATTERY PERFORMANCE DATA
                  Week ending 15 June 2001


     8 June 2001 - GMT Day 159 Beta = 26.7 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      12.0      0.000      0.0
2    +11.2/-112.0    +6.44/+4.51  +28.8/-15.2    23.8      1.030      21.9
3    +22.4/-67.2     +5.47/+3.23  +28.4/-16.0    23.8      1.020      21.6


     15 June 2001 - GMT Day 166 Beta = 33.4 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      12.0       0.000     0.0
2    +11.2/-78.4     +6.44/+4.51   +28.4/-15.2    23.8       1.030     20.2
3    +16.8/-89.6     +5.15/+3.55   +28.0/-15.2    23.8       1.020     19.9


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

                                APPENDIX E
                     UARS ANOMALY REPORTS
                    Week ending 08 June 2001

                 NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT     TIME        TTR      PROBLEM/DATA LOSS
------     ------     -----     ----        ---      -----------------
01-032     FOT        53272     160/1121    14170    Generic Late Acquisition
01-037     FOT        53292     161/1820    N/A      Unable to Load ATC
01-032     FOT        53358     166/0401    14170    Generic Late Acquisition


                ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.     SUBSYS     ORBIT     TIME        TTR      PROBLEM/DATA LOSS
------     ------     -----     ----        ---      -----------------
-None this report period


              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
------     ------     -----     ----        ---      -----------------
01-032     FOT        see list  June 01     14170    Generic Late Acquisition
01-033     FOT        53222     157/0220    N/A      /CDEL function not working
01-034     FOT        53225     157/0754    N/A      Unable to dump ATC
01-037     FOT        53292     161/1820    N/A      Unable to load ATC



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