UARS Weekly Status Report

30 July 2004




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                UARS WEEKLY STATUS REPORT - 30 JUL 2004

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

Nothing received.

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

SUSIM successfully gathered its daily mid (1.1 nm) resolution, MgII,
occultation, solar pointing offset, and continuous monitoring scans
for periods of UARS real-time telemetry or onboard tape recording.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.

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

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

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


                           REPORTING PERIOD

This report covers 17 July 2004 (Orbit 70308, GMT Day 199) through  23
July 2004 (Orbit 70412, GMT Day 205).


                         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      203/1230      70375     DAY ONLY TO FULLTIME
       SUSIM         203/1552      70378     POWER ON
       PEM           204/1407      70391     OFF TO DAY ONLY


A Forward-to-Reverse Yaw Around maneuver (number 131) was successfully
executed in Orbit 70317 beginning 199/ 15:04:25Z and completing at
199/ 15:41:35Z on 17 July 2004.  All instruments were in their off or
standby mode (except for SOLSTICE in day-only).  Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 57.89 minutes.  Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.51 and 20.04 percent
respectively.  The next (reverse-to-forward) YAW is scheduled for 18
August 2004 (DOY 231).

The beta angle ranged between the angles of 01.3 degrees to 19.2
degrees for this report period.  The beta angle is now increasing
towards a maximum angle of 39 degrees on 01 August 2004 (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 0.63 to 0.96 degrees C.  Additional
battery performance data for each battery on 16 July and 23 July 2004
are provided in Appendix D.

The clock error ranged from 10.8 to -10.0 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
    SOLSTICE  =    01
    SUSIM     =    01
    PEM       =    01


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

    FOT       =    04

Three (3) Anomaly Report remained OPEN at the end of this report
period (see Appendix E).


                        GROUND SYSTEM OPERATION

Four (4) 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 continued testing the new version of the Eclipse ground system
software.  There are several DR fixes incorporated in the build, so
testing will take some time.  The goal for the testing to be complete
is the end of the July.  If all testing is successful the new build
will be released to operations.

The new CMS code to allow for SMA events continued to undergo testing
this week.  Problems receiving products from FDF, transferring the
schedule from UPS to CMS, and system drive issues hindered progress.
While the system drive issues have been resolved, the other two issues
are still under investigation.

                               MEETINGS


-None this report period.





                                   
                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 18 August 2004 (DOY 231).
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 23 July 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
70317   199/1449   04-210   MACS        YAW MANEUVER COMMANDS
70326   200/0623   04-211   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
70347   201/1457   04-210   MPS         VT-6 TO VT-5
70348   201/1638   04-212   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
70375   203/1230   04-213   SOLSTICE    DAY ONLY TO FULLTIME
70378   203/1552   04-214   SUSIM       POWER ON (PARTIAL)
70390   204/1227   04-214   SUSIM       POWER ON (COMPLETE)
70391   204/1407   04-215   PEM         OFF TO DAY ONLY


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 23 July 2004

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 23 July 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
70326          200/0630               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
70348          201/1639               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY

                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 23 July 2004

     16 July 2004 - GMT Day 198 Beta = 04.7 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    -700.0/-700.0   -3.68/-4.31  +00.0/+00.0  07.0     0.00     0.0
2     -05.6/-22.4    +4.51/+3.87  +16.8/-12.0  26.7     1.11    18.8
3     +16.8/-22.4    +3.55/+2.92  +16.0/-11.6  26.7     1.11    18.4

     23 July 2004 - GMT Day 205 Beta = 04.7 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    -700.0/-700.0   -3.68/-4.94  +00.0/+00.0   07.0     0.00     0.0
2     -00.0/-44.8    +4.19/+3.23  +27.2/-12.8   26.2     1.01    18.5
3     +11.2/-72.8    +2.92/+2.29  +25.6/-12.8   26.2     1.00    18.1

     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
70347          200/1457   VT6 -> VT5


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 23 July 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-039    FOT       70335     200/2037  30832     Generic Late Acquisition
04-039    FOT       70335     202/0800  30832     Generic Late Acquisition
04-047    FOT       70367     202/2252  N/A       WS-4 not responding properly
04-048    FOT       70395     204/1920  36444     Data Dropout

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-043    FOT       70203     192/0155  30824     Data Dropout (18 sec)
04-044    SSPP      70234     194/0229  N/A       SSPP File Xfer Error on CMS
04-045    FOT       70258     195/1750  36367     Data Dropout @ White Sands
04-046    FOT       70290     197/2031  36385     Data Dropout Bad Weather @ WS

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

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-039    FOT       See List  July 04   30832     Generic Late Acquisition
04-047    FOT       70367     202/2252  N/A       WS-4 not responding
properly
04-048    FOT       70395     204/1920  36444     Data Dropout