UARS Weekly Status Report

23 August 2002




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                UARS WEEKLY STATUS REPORT - 23 Aug 2002

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing recieved.

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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
***********

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.

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

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

                           REPORTING PERIOD

This  report covers 10 August 2002 (Orbit 59678, GMT Day 222)  through
16 August 2002 (Orbit 59782, GMT Day 228).


                         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        222/1325      59686     POWER ON
       WINDII        222/1421      59686     POWER OFF
       WINDII        224/1929      59719     POWER ON
       WINDII        224/2150      59721     POWER OFF
       PEM           226/2147      59751     POWER OFF AXIS

The  beta  angle  ranged between the angles of 27.4  degrees  to  42.1
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 45 degrees on 19 August 2002 (DOY 231).

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 23.6 V end-of-night (EON) load  bus
voltage.   Battery  temperatures are stable with a  temperature  delta
between Battery 2 and Battery 3 of 1.28 to 0.64 degrees C.  Additional
battery  performance data for each battery on 09 August and 16  August
2002 are provided in Appendix D.

The  clock  error  ranged from -10.6 to 11.6 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       =    06
    WINDII    =    06
    PEM       =    01


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

    FOT  =    01

Two  (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

One  (1)  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).


                       OTHER SIGNIFICANT EVENTS


                       UARS SATELLITE OPERATIONS


The Raytheon development team has delivered a new database patch,
which should fix the status buffer display problem.  This patch has
been tested this week on the prototype system but the FOT is waiting
for some more fixes before it will be installed on the operational
system.

The FOT continues to work with the WINDII instrument team to determine
the source of their instrument turn on problem.  On 10 August 2002
WINDII was turned on is a different state than nominal to try to
capture their base daytime aperture observation in order to determine
if the problem was indeed with the loads or with the instrument
itself.  This test did not work and error codes were received
immediately after sending the execute command to start instrument
observations.  The WINDII PI team will attempt another solution on 18
August 2002.

Meanwhile the FOT spent a good portion of the week trying to isolate
any problem with the WINDII loads being used.  An old AP disk pack was
found and was dumped onto CDROM.  From this dump the FOT was able to
extract the CMS files names of the WINDII loads and their creation
date.  With this information the FOT could them pull these loads off
of CMS backup tapes and regenerate the loads.  When this was done the
FOT found that these loads compared exactly to the loads currently
being used to load WINDII.  This finding leads the FOT to believe that
the source of the problem does not lie in the loads and will continue
to work with the WINDII PI team to resolve this issue.


                               MEETINGS

-    None this report period


                       FUTURE SIGNIFICANT EVENTS


The  next UARS Yaw slew is scheduled for 04 September 2002 (DOY  247).
This  maneuver will be a Reverse to Forward Flight maneuver  (Southern
Hemisphere viewing).




Attachments:    Appendix A,      Real-time Command 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 16 August 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
59680   222/0446   02-284   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
59686   222/1325   02-285   WINDII      POWER ON
59686   222/1421   02-286   WINDII      POWER OFF
59693   223/0037   02-287   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
59711   224/0550   02-288   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
59718   224/1643   02-289   MPS         VT LEVEL 6
59719   224/1929   02-290   WINDII      POWER ON
59720   224/2109   02-291   WINDII      WIERRFIX
59721   224/2150   02-292   WINDII      WINDII ERR FIX
59721   224/2150   02-293   WINDII      POWER OFF
59721   224/2150   02-294   MPS         VT LEVEL 5
59751   226/2147   02-295   PEM         POWER OFF AXIS
59782   228/2321   02-296   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY

                                   
                                   
                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 16 August 2002

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 16 August 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
59680          222/0452               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
59693          223/0040               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
59711          224/0553               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
59782          228/2329               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
                                   
                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 16 August 2002


     09 August 2002 - GMT Day 221 Beta = 27.2 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  -146.0/-168.0 -3.05/-4.01  +00.0/+00.0  08.5     0.000     0.0
2   +11.2/-123.0 +5.79/+4.53  +27.2/-17.4  27.5     1.030    21.0
3   +22.4/-44.8  +5.08/+3.87  +26.4/-17.4  27.5     1.020    20.5


     16 August 2002 - GMT Day 228 Beta = 42.1 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  -134.4/-156.8 -3.05/-4.31  +00.0/+00.0  08.5     0.000     0.0
2   +11.2/-123.2 +5.15/+3.87  +25.6/-50.0  25.4     1.030    19.5
3   +22.4/-44.8  +3.87/+3.23  +25.2/-50.0  25.4     1.030    19.3


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
59718          224/1643   L5 -> L6
59721          224/2150   L6 -> L5


                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 16 August 2002


                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-045    FOT       59717     224/1458  14170     Generic Late Acquisition

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

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

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-039    FOT       See List  July      30832     Generic Late Acquisition
02-045    FOT       59717     224/1458  14170     Generic Late Acquisition