UARS Weekly Status Report

02 January 2004




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                UARS WEEKLY STATUS REPORT - 02 JAN 2004

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

SOLSTICE continues to operate in good health gathering solar data on 
all available orbital tracking periods.

***********
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 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 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 1992209.

     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 
***********

2003 was a successful operational year for HALOE.  The following 
instrument performance values continue to be as expected for 2003:
-  Science channel end to end  trends of solar exoatmospheric values
-  Instrument temperatures and voltages values
-  gain and boresight test results

Use of the tape recorder to capture events, that do not occur during 
TDRS contacts, provides the capability to capture most of the sunrise 
and sunset events except during few days during the year.  The third 
TDRS will hopefully fill in the coverage in addition to provide more 
opportunities for other instruments.  The third TDRS may also provide 
additional power management options during low beta angles by limiting 
use of the transmitter during solar array night.

Science data processing at LaRC continues successfully, but data 
contamination, primarily from zero fill, provides processing and data 
certification challenges. However the challenges are worthwhile. The 
science data products continue to be excellent and many instrument teams 
use the HALOE data for comparisons.

During a time of limited resources the UARS Flight Operations Team has 
performed superbly.  In addition to keeping an aging spacecraft fling 
true, they have provided the extra effort required now to support 
instrument operations.  Tape recorder scheduling has been near flawless 
and the many  power-on's has been extremely smooth.  Our thanks to you 
from the HALOE Operations Team .  Happy New Year.

***********
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 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 20 December 2003 (Orbit 67150, GMT Day 354) through
26 December 2003 (Orbit 67254, GMT Day 360).


                         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
       PEM           356/1233      67187     AXIS On
       PEM           356/1419      67188     AXIS Off
       PEM           356/1419      67188     AXIS On
       HALOE         357/0253      67196     Power Off
       PEM           359/1308      67232     Fulltime
       PEM           360/2145      67253     AXIS-2 Off



The  beta  angle  ranged between the angles of 33.2  degrees  to  63.4
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  19  December  and  26
December 2003 are provided in Appendix D.

The  clock  error  ranged from 10.5 to -10.1 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).

    PEM       =    05
    FOT       =    03
    HALOE     =    01

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

    FOT  =    00

Five (5) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

No 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 26 December 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
67183   356/0631   03-329   OBC         CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67187   356/1233   03-330   PEM         AXIS POWER ON
67188   356/1419   03-331   PEM         AXIS POWER OFF
67188   356/1419   03-330   PEM         AXIS POWER ON
67196   357/0235   03-332   HALOE       POWER OFF
67206   357/1930   03-333   OBC         CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67232   359/1308   03-334   PEM         DAY-ONLY TO FULLTIME
67235   359/1741   03-335   OBC         CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67253   360/2145   03-336   PEM         AXIS-2 POWER OFF



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 26 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 26 December 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
67183          356/0631               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
67206          357/1930               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67235          359/1741               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY







                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 26 December 2003


     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     0.00      0.0
2     +11.2/-16.8  +5.46/+4.50  +28.4/-13.6  25.0     1.03     20.6
3     +16.8/-22.4  +4.50/+3.87  +27.6/-13.6  24.8     1.02     20.3

     26 December 2003 - GMT Day 360 Beta = 63.4 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 -3.67/-4.62  +00.0/+00.0  07.2     0.00      0.0
2     +11.2/-22.4  +3.87/+2.91  +20.4/-15.2  26.4     1.02     17.5
3     +11.2/-33.6  +2.91/+1.97  +20.0/-14.8  26.4     1.01     17.0


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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 26 December 2003

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

                 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