UARS Weekly Status Report

02 August 2002




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                UARS WEEKLY STATUS REPORT - 02 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
***********

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.

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.

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HALOE 
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Nothing received.

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MLS
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Nothing received.

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HRDI
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Nothing received.

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WINDII
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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.

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CDHF
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FOT
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                           REPORTING PERIOD

This report covers 20 July 2002 (Orbit 59362, GMT Day 201) through  26
July 2002 (Orbit 59467, GMT Day 207).


                         SPACECRAFT OPERATION

The observatory is now in Forward Flight (Southern Hemisphere viewing)
and   is  performing  nominally  under  two-battery  operations.   The
instrument operational changes were:


                    INSTRUMENT OPERATIONAL CHANGES

       Instrument    Time          Orbit     Comment
       WINDII        202/0056      59375     POWER OFF
       HALOE         202/1335      59385     POWER ON


The  beta  angle  ranged between the angles of 53.9  degrees  to  28.1
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 02 August 2002 (DOY 214).

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 1.34 degrees C.  Additional
battery performance data for each battery on 19 July and 26 July  2002
are provided in Appendix D.

The  clock  error  ranged from 11.4 to 10.2 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       =    03
    WINDII    =    01
    HALOE     =    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 FOT finished testing the Eclipse software patch to fix erroneous
alarm messages.  It is now installed on the realtime system and has
been working successfully since installation.  The Raytheon
development team has also solved the problem seen on the status buffer
display and will deliver a new database this week for testing.

                               MEETINGS
-None this report period


                       FUTURE SIGNIFICANT EVENTS


The  next  UARS  Yaw slew is scheduled for 02 August 2002  (DOY  214).
This  maneuver will be a Forward to Reverse Flight maneuver  (Northern
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 26 July 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
59375   201/2200   02-254   WINDII      POWER OFF
59377   202/0056   02-255   OBC/CLK     CLK ADJ FR 0.00 TO 20.6 MSEC/DAY
59385   202/1335   02-256   HALOE       POWER ON
59397   203/0817   02-257   OBC         ATC NOOP;XMTR-ON CMD
59400   203/1334   02-258   OBC/CLK     CLK ADJ FR 20.6 TO 0.00 MSEC/DAY

                                   
                                   
                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 26 July 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 26 July 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
59377          202/0103               CLK ADJ FR 0.00 TO 20.6 MSEC/DAY
59400          203/1339               CLK ADJ FR 20.6 TO 0.00 MSEC/DAY
                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 26 July 2002


     19 July 2002 - GMT Day 200 Beta = 58.1 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  -157.0/-123.7 -3.30/-4.52  +00.0/+00.0  8.4     0.000     0.0
2  + 11.2/- 67.2 +3.87/+2.60  +20.8/-13.5 25.8     1.030    17.7
3  + 22.4/- 33.6 +2.92/+1.97  +20.3/-13.4 25.6     1.020    17.3


     26 July 2002 - GMT Day 207 Beta = 28.1 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  -157.0/-168.0 -3.30/-4.24  +00.0/+00.0  08.5     0.000     0.0
2  + 11.2/- 69.6 +6.44/+5.15  +27.5/-17.9  27.8     1.030    21.8
3  + 22.4/- 56.0 +5.21/+3.87  +26.7/-17.6  27.7     1.020    21.4


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
-None this report period


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 26 July 2002


                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-039    FOT       59368     201/1002  30832     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
02-041    FOT       59279     195/1156  N/A       TMON 01 tripped