UARS Weekly Status Report

19 July 2002




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                UARS WEEKLY STATUS REPORT - 19 JULY 2002

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

SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.

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

SUSIM has 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.

     PEM has been working with the GUVI team to identify a second time period 
for coordinated measurements.  The orbital conditions are different from the 
first period where now the TIMED-UARS orbits are nearly perpendicular.  
PEM operation is requested to begin three orbits prior to and last for three 
orbits after conjunction times.  Predicted orbital conjunctions as of July 10 
(varies with each new set of predictions) are:

  STK
Contact #    Date    Day  Time   Geo Lat   ILAT   MLT  Hemisphere  Note
                                  (deg)   (deg)   (hr)
 12       July  13  194  00:34   51.53   62.04  19.92  North
 13       July  13  194  01:22  -51.41   63.43   6:37  South
 14       July  13  194  02:11   49.33   59.59  19.55  North
 15       July  17  198  19:36   48.20   45.46  19.17  North
 16       July  17  198  20:24  -48.05   59.75   7.26  South
 17       July  17  198  21:12   47.90   50.80  19.49  North

There have been only minor changes since the last conjunction time update.

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.

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

                           REPORTING PERIOD

This report covers 06 July 2002 (Orbit 59152, GMT Day 187) through  
12 July 2002 (Orbit 59256, GMT Day 193).


                         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        188/1345      59175     Power On
       SUSIM         188/1820      59178     Power On
       SUSIM         189/1309      59190     Power Off
       PEM           189/1457      59191     Day-Only
       WINDII        189/1901      59193     Power Off
       SUSIM         190/0004      59196     Power On
       WINDII        192/1714      59237     Power On
       WINDII        192/1952      59239     Power Off
       SOLSTICE      193/2132      59255     Day-Only


The  beta  angle  ranged between the angles of 55.4  degrees  to  78.1
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 79 degrees on 13 July 2002 (DOY 194).

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 0.05 to 0.63 degrees C.  Additional
battery performance data for each battery on 05 July and 12 July  2002
are provided in Appendix D.

The  clock  error  ranged from -13.0 to 11.7 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  =    02
    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    =    06
    SUSIM     =    04
    SOLSTICE  =    01
    PEM       =    01



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

    FOT  =    02

One  (1) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

Two  (2)  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


UARS is currently flying through its high beta period.  In this beta
range the power availability fluctuates due to the geometry of the
orbit to sun angle, therefore both WINDII and SUSIMs turn on schedules
had to be modified to account for these power fluctuations.  The data
from this period will be analyzed to see if any future modifications
are needed during this high beta period.

                               MEETINGS

The FOT attended the UARS Monthly Meeting on 10 July 2002.


                       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 12 July 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
59175   188/1345   02-234   WINDII      Power On
59175   188/1458   02-235   OBC         Clk Adj from 0.0 to 20.6 msec/day
59178   188/1820   02-236   SUSIM       Power On
59188   189/1021   02-236   SUSIM       Power On (Completed)
59190   189/1309   02-237   SUSIM       Power Off
59191   189/1457   02-238   PEM         Day-Only
59193   189/1818   02-239   WINDII      Error Fix
59193   189/1901   02-239   WINDII      Error Fix
59193   189/1901   02-240   WINDII      Power Off
59196   190/0004   02-241   SUSIM       Power On
59199   190/0330   02-242   OBC         Clk Adj from 20.6 to 41.2 msec/day
59226   192/0004   02-243   OBC         Clk Adj from 41.2 to 20.6 msec/day
59237   192/1714   02-244   WINDII      Power On
59239   192/1952   02-245   WINDII      Power Off
59255   193/2132   02-246   SOLSTICE    Day-Only

                                   
                                   
                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 12 July 2002

The following Out-Of-Limits occurrences were detected:

MNEMONIC       STATE   DESCRIPTION                ORBITS
--------       -----   -----------                ------
HRPTSBARTEMP   Y-HI    HRDI Barrel Temp           59241-45
HRPTSBARTEMP   R-HI    HRDI Barrel Temp           59246-48


The following ALERT occurrences were detected:

MNEMONIC     DESCRIPTION                          ORBITS
--------     -----------                          ------
-None this report period.

______________________________________________________________________

                              APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                       Week ending 12 July 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
59175          188/1458               Clk Adjust from 0.0 TO 20.6 msec/day
59199          190/0330               Clk Adjust from 20.6 TO 41.2 msec/day
59226          192/0004               Clk Adjust from 41.2 TO 20.6 msec/day



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 12 July 2002


     05 July 2002 - GMT Day 186 Beta = 55.3 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   +33.6/-22.4 -3.05/-4.62  +00.0/+00.0   8.5     0.000     0.0
2    00.0/-69.6 +4.50/+2.60  +22.0/-16.4  25.8     1.040    17.8
3   +22.4/-22.4 +3.55/+1.66  +21.7/-16.2  25.8     1.035    17.7


     12 June 2002 - GMT Day 193 Beta = 78.1 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   -69.6/-78.4 -2.11/-2.77  +00.0/+00.0   8.5     0.000     0.0
2   +11.2/-67.2 +1.97/+1.34  +11.4/-13.5  24.8     1.029    10.7
3   +22.4/-22.4 +1.66/+0.71  +11.0/-13.5  24.6     1.020    10.6


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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 12 July 2002


                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-040    FOT       59191     189/1457  31083     Data Dropouts on T-3 line


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-040    FOT       59191     189/1457  31083     Data Dropouts on T-3 line


                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