UARS Weekly Status Report

13 February 2004




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                UARS WEEKLY STATUS REPORT - 13 FEB 2004

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

During this week SOLSTICE continued to operate in good health gathering 
solar data on all available orbital tracking periods. On average, we 
received 57% of each day's data amounting to about 439 minutes of solar 
observing time per day.

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

SUSIM successfully gathered all of its daily mid (1.1 nm) resolution,
Mg II, occultation, solar pointing offset and high resolution
monitoring scans during this past week for periods of UARS real-time
telemetry or onboard tape recording.

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

     Level 2 PEM HEPSA data files are being reprocessed for submission to the 
DAAC.  This data has been designated as version 2; however, there is no format
difference from the version 1 data format.  Version 2 HEPSA data is being 
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files.  Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files.  Currently, HEPSA data between 1991274 and 2003149 has been 
reprocessed and archived at the GSFC DAAC.

     Level 2 PEM MEPS data file documentation is complete and submitted to 
the DAAC.  MEPS data files are version 1.  Processed MEPS data files at the 
DAAC archive are between 1991274 and 1993209.  MEPS data files between
1993210 and 1993216 are waiting for DAAC collection.

     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.

     The PEM data from the GUVI conjunction periods may be found at 
http://wwwpem.space.swri.edu/guvi-pem.html.



*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.

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

Nothing received.

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

Nothing received.

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

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

This  report covers 31 January 2004 (Orbit 67781, GMT Day 031) through
06 February 2004 (Orbit 67885, GMT Day 037).


                         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
       PEM           033/1910      67823     DAY-ONLY TO OFF
       PEM           036/0017      67856     POWER ON - DAY ONLY


The  beta  angle  ranged between the angles of 33.7  degrees  to  40.8
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 21 February 2004 (DOY 052).

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 0.96 to 1.28 degrees C.  Additional
battery  performance  data  for each battery  on  30  January  and  06
February 2004 are provided in Appendix D.

The  clock  error  ranged from 12.1 to -11.0 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       =    10
    SUSIM     =    01
    HALOE     =    01
    PEM       =    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


This week the FOT completely backed up the operational CMS on 02
February 2004.  The following day the CMS had the new 3-TDRS code
installed.  Then on 04 February 2004 the FOT successfully executed the
uplink of the 3-TDRS patch.  The uplink of the flight software went
extremely smoothly and the FOT would like to thank the FSW group for
all its hard work in making it so easy.  The UARS Eclipse ground
system was also updated with the new build following the flight
software patch.  This build contains new telemetry and commands to
support the 3-TDRS functionality.  This transition went very well also
and all ground systems are in their 3-TDRS mode.

One problem was found during the transition however.  The spacecraft
ephemeris was rejected onboard UARS late Wednesday evening.  It was
found that the load was truncated and zero-filled for approximately
the last third of the load.  The spacecraft continued to use the
existing ephemeris and was safe until a new load could be built and
uplinked.  After some problems building this new load and a few tests
it was determined that the new CMS code was the source of the problem.
A new load was built from the old CMS code and uplinked.  The FOT will
continue to build the spacecraft ephemeris on the old version of
software until the problem with the code can be resolved.  The FOT
also has new checks in place to verify the ephemeris contents before
uplinking them to the spacecraft.




                               MEETINGS


The  FOT  called  a working meeting on 05 February to review  the  CMS
problem and determine the future course of action.




                                   
                       FUTURE SIGNIFICANT EVENTS

The  next  UARS Yaw slew is scheduled for 21 February 2004 (DOY  052).
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 06 February 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
67781   031/0028   04-038   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67799   032/0430   04-039   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67801   032/0757   04-040   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
67812   033/0240   04-041   SUSIM       CLEARED EXCEPTION MONITOR
67814   033/0532   04-042   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
67820   033/1408   04-043   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67821   033/1628   04-044   HALOE       STOW CMDS
67823   033/1910   04-045   PEM         DAY-ONLY TO OFF
67836   034/1547   04-046   OBC         DUMP TABLE 4 & 5
67840   034/2232   04-047   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67841   035/0019   04-048   OBC         ATC NOOPS 3 TDRSS
67853   035/1904   04-049   OBC         3 TDRSS OBC PATCH
67856   036/0017   04-050   PEM         POWER ON - DAY ONLY
67858   036/0236   04-051   OBC         DUMP OBC BANKS 0 THRU 15



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 06 February 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 06 February 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
67781          031/0034               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67799          032/0432               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67801          032/0806               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
67814          033/0534               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
67820          033/1408               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67840          034/2232               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY

                                   APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 06 February 2004


     30 January 2004 - GMT Day 030 Beta = 33.4 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 -3.05/-4.31  +00.0/+00.0  07.0     0.00      0.0
2     +11.2/-179.2 +5.79/+4.50  +28.4/-14.4  25.1     1.04     20.9
3     +11.2/-123.2 +5.14/+3.55  +28.0/-15.2  25.1     1.03     20.7

     06 February 2004 - GMT Day 037 Beta = 40.8 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 -3.05/-4.31  +00.0/+00.0  07.0     0.00      0.0
2     +16.8/-145.6 +5.47/+4.51  +26.8/-15.2  25.1     1.03     20.2
3     +11.2/-100.8 +4.51/+3.23  +26.4/-15.2  25.1     1.02     19.9


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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 06 February 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-009    FOT       67854     035/2126  N/A       EPHEMERIS REJECTED

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-004    FOT       67589     018/0624  N/A       IP NOCC switch problems
04-006    FOT       67684     024/1322  34874     HPA Failure
04-007    FOT       67688     024/2017  N/A       Could Not Load
04-008    SOLSTICE  67688     024/2017  N/A       SOLSTICE Detectors RED

                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
------    ------    -----     ----      ---       -----------------
04-001    FOT       See List  Jan 04    30832     Generic Late Acquisition
04-009    FOT       67854     035/2126  N/A       EPHEMERIS REJECTED