UARS Weekly Status Report

26 December 2003




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                UARS WEEKLY STATUS REPORT - 26 DEC 2003

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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 53% of each day's data amounting to about 515 minutes of solar 
observing time per day.

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

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

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

                    *** Happy Holidays from 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 2003119 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 1992129.

     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.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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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 recieved.
                  
***********
FOT
***********

                           REPORTING PERIOD

This report covers 13 December 2003 (Orbit 67044, GMT Day 347) through
19 December 2003 (Orbit 67148, GMT Day 353).


                         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
       SUSIM         347/1813      67055     Power On
       HRDI          348/0641      67063     Reboot
       SOLSTICE      348/1200      67066     Power On (Fulltime)
       PEM           348/1621      67069     Day Only
       HALOE         349/1338      67082     Power On


The  beta  angle  ranged between the angles of  2.0  degrees  to  33.2
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 80 degrees on 01 January 2004 (DOY 001).

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 0.94 degrees C.  Additional
battery  performance  data for each battery  on  12  December  and  19
December 2003 are provided in Appendix D.

The  clock  error  ranged from 10.4 to -3.1 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       =    02
    SUSIM     =    02
    HALOE     =    02
    SOLSTICE  =    01
    PEM       =    01
    HRDI      =    01



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

    FOT  =    06

Five (5) Anomaly Reports 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 three new desktops have been created at JPL to support the three
possible configurations needed for UARS DSN events.  Now that these
desktops have been made, another spacecraft test has been scheduled
for 30 December 2003.

The FOT continued to investigate the large attitude errors seen on the
simulator during each run of the day-in-the-life (DITL).  The power
issues that caused the attitude to diverge were corrected but
subsequent runs still showed the spacecraft (on the simulator) lose
control.  More analysis is needed to determine the reason behind the
large errors.  This problem needs to be resolved so that the DITL
testing can continue.




                               MEETINGS


-None this report period


                       FUTURE SIGNIFICANT EVENTS

The  next  UARS Yaw slew is scheduled for 20 January 2004  (DOY  020).
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 19 December 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
67044   347/0104   03-307   MPS         BATSOC
67049   347/0837   03-308   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
67055   347/1813   03-309   SUSIM       POWER ON (PART 1)
67063   348/0641   03-313   HRDI        REBOOT
67066   348/1200   03-314   SOLSTICE    DAY-ONLY TO FULLTIME
67067   348/1256   03-310   SUSIM       POWER ON (COMPLETE)
67069   348/1621   03-311   PEM         ZEPS/HEPS DAY-ONLY
67082   349/1338   03-312   HALOE       POWER ON (PART 1)
67085   349/1810   03-315   HALOE       POWER ON (COMPLETE)



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 19 December 2003

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 19 December 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
67049          347/0837               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY

                             APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 19 December 2003

     12 December 2003 - GMT Day 346 Beta = 06.1 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    -700.0/-700.0 -3.05/-4.31  +00.0/+00.0  07.2     0.000     0.0
2     +11.2/-33.6  +5.46/+4.50  +28.4/-13.2  26.4     1.020    19.9
3     +16.8/-44.8  +4.50/+3.23  +27.2/-12.8  26.4     1.020    19.2


     19 December 2003 - GMT Day 353 Beta = 33.2 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    -700.0/-700.0 -3.05/-4.31  +00.0/+00.0  07.2     0.000     0.0
2     +11.2/-16.8  +5.46/+4.50  +28.4/-13.6  25.0     1.030    20.6
3     +16.8/-22.4  +4.50/+3.87  +27.6/-13.6  24.8     1.020    20.3

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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 19 December 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-057    ATC       67044     347/0100  N/A       S/W Stored Cmd Error
03-058    HRDI      67059     348/0101  N/A       Not accepting loads
03-055    FOT       67091     350/0314  30832     Generic Late Acquisition
03-055    FOT       67094     350/0829  30832     Generic Late Acquisition
03-059    FOT       67098     350/1515  34541     TDRSS East MA Problem
03-055    FOT       67141     353/1102  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
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
------    ------    -----     ----      ---       -----------------
03-055    FOT       See List  Dec 03    30832     Generic Late Acquisition
03-056    FOT       66992     343/1259  34488     Data Drops
03-057    ATC       67044     347/0100  N/A       S/W Stored Cmd Error
03-058    HRDI      67059     348/0101  N/A       Not accepting loads
03-059    FOT       67098     350/1515  34541     TDRSS East MA Problem