UARS Weekly Status Report

16 August 2002




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                UARS WEEKLY STATUS REPORT - 16 AUG 2002

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

Nothing received.

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

SUSIM successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.

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

Nothing received.

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

     PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period.  Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.  
GUVI images from other times from this conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present.  Separation
is several minutes to 10's of minutes.  A PEM representative attended
the TIMED workshop August 7-9.

     PEM data from the second GUVI-PEM conjunction is now being processed.

     PEM continues to receive NMC data files from NOAA.  No problems have
been encountered.  NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.



*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.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

***********
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.
                  
***********
FOT
***********

                           REPORTING PERIOD

This  report covers 03 August 2002 (Orbit 59572, GMT Day 215)  through
09 August 2002 (Orbit 59677, GMT Day 221).


                         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
       SOLSTICE      217/1325      59610     POWER ON
       SUSIM         217/1649      59612     POWER ON
       PEM           218/1423      59626     AXIS-1 POWER ON
       PEM           218/1504      59627     AXIS-1 POWER OFF/ON
       HALOE         220/1320      59655     POWER ON
       HALOE         220/1320      59655     POWER OFF
       HALOE         220/1501      59657     POWER ON
       PEM           221/1318      59670     POWER ON - ZEPS/HEPS
                                             DAY ONLY

The  beta  angle  ranged between the angles of 1.31  degrees  to  27.2
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 1.29 to 1.21 degrees C.  Additional
battery  performance data for each battery on 02 August and 09  August
2002 are provided in Appendix D.

The  clock  error  ranged from -10.2 to 10.8 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  =    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       =    07
    SOLSTICE  =    02
    SUSIM     =    02
    PEM       =    02
    HALOE     =    02


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

    FOT  =    01

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


                        GROUND SYSTEM OPERATION

One  (1)  operational support problem 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.  It was recently
discovered, by the WINDII team, that WINDII's science data has not
been captured correctly since February.  There were discrepancies
found in their POCC resident microloads during Eclipse transition and
the investigation has been focused on determining if these loads are
correct.  An engineering test will be done on 10 August to try to
isolate the source of the problem.


                               MEETINGS

The FOT attended the UARS MSR on 06 August 2002.


                       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 09 August 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
59580   215/1244   02-268   MPS         YAW (return to VT Level 5)
59581   215/1426   02-269   MPS         BATSOC RESET
59610   217/1241   02-270   SOLSTICE    MUB ENABLE
59610   217/1325   02-271   SOLSTICE    POWER ON
59612   217/1649   02-272   SUSIM       POWER ON (PART-1)
59613   217/1757   02-272   SUSIM       POWER ON (PART-1 COMPLETE)
59623   218/1000   02-273   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
59626   218/1423   02-274   PEM         AXIS-1 POWER ON
59627   218/1504   02-274   PEM         AXIS-1 POWER OFF/ON
59640   219/1238   02-272   SUSIM       POWER ON COMPLETE
59640   219/1238   02-276   SUSIM       SUSIM CMDS
59641   219/1423   02-275   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
59643   219/1754   02-277   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
59655   220/1320   02-278   HALOE       POWER ON
59655   220/1320   02-279   HALOE       POWER OFF
59657   220/1501   02-278   HALOE       POWER ON
59658   220/1647   02-280   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
59664   221/0301   02-282   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
59670   221/1318   02-283   PEM         POWER ON - ZEPS/HEPS DAY-ONLY

                                   
                                   
                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 09 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 09 August 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
59623          218/1000               CLK ADJ FR 0.00 TO -20.6 MSEC/DAY
59641          219/1433               CLK ADJ FR -20.6 TO 0.00 MSEC/DAY
59643          219/1839               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
59658          220/1656               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
59664          221/0305               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
                                   
                                   
                                   
                                   
                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 09 August 2002


     02 August 2002 - GMT Day 214 Beta = 0.0 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  -157.0/-168.0 -3.05/-4.62  +00.0/+00.0  08.5     0.000     0.0
2   +11.2/-69.6  +5.47/+4.08  +27.0/-13.4  23.8     1.090    20.4
3   +22.4/-50.4  +4.51/+2.92  +25.7/-13.5  23.8     1.080    20.0


     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


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
59580          215/1248   L6 -> L5




                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 09 August 2002


                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS   ORBIT    TIME      CDS      PROBLEM/DATA LOSS
------    ------   -----    ----      ---       -----------------
02-044    FOT      59629    218/1756  31261    Equipment Fail-over at WS
                                               50 second data loss, non-recov

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS   ORBIT    TIME      CDS      PROBLEM/DATA LOSS
------    ------   -----    ----      ---      -----------------
02-041    FOT      59279    195/1156  N/A      TMON 01 tripped
02-042    FOT      59503    210/0959  N/A      TMON 01 tripped
02-043    FOT      59571    214/2308  31245    Data Drop Out
02-044    FOT      59629    218/1756  31261    Equipment Fail-over at WS
                                               50 second data loss, non-recov

                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
02-044    FOT      59629     218/1756  31261   Equipment Fail-over at WS
                                               50 second data loss, non-recov