UARS Weekly Status Report

12 September 2003




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                UARS WEEKLY STATUS REPORT - 12 Sep 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. We received about 
50% of the gathered data and 400 minutes of solar data per day.

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

SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and O2 occultation scans during periods of UARS telemetry or
periods of onboard tape recording.

***********
ACRIM
***********

Nothing received.

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

     The PEM web site has moved.  It has a new URL.  Access the PEM web site
using http://wwwpem.space.swri.edu.  The PEM data from the GUVI conjunction
periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html.

     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 2002159 has been 
reprocessed and archived at the GSFC DAAC.  HEPSA data files from 2002160
through 2002179 and from 2002230 through 2002239 are processed and awaiting 
archiving at the DAAC.

     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.  
GUVI images from other times from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present.  Separation
is several minutes to 10's of minutes when both instruments saw aurora. 
PEM has seen no aurora during the second conjunction period.  Due to a 
spacecraft anomaly, no PEM data was collected during the third conjunction 
period.

     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.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

A revised version of the UARS movie has been installed
on the UARS Science Web Page:  http://umpgal.gsfc.nasa.gov  
under "UARS Movies".

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.

The MPG participated in a meeting on 10 September which was
held to discuss current status of the effort to modify UARS
ground station and flight software so that UARS can use 
3 TDRS satellites each orbit.

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

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

REPORTING PERIOD

This  report covers 30 August 2003 (Orbit 65465, GMT Day 242)  through
05 September 2003 (Orbit 65570, GMT Day 248).


                         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           243/1331      65488     POWER ON ZEPS/NEPS DAYOPS
       HALOE         244/1328      65503     POWER ON
       HRDI          245/0646      65514     F/T TO DAY ONLY (LOW PWR)
       HRDI          245/1549      65520     FULL-TIME OPERATIONS


The  beta  angle  ranged between the angles of 10.9  degrees  to  34.8
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 60 degrees on 15 September 2003 (DOY 258).

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  29  August  and  05
September 2003 are provided in Appendix D.

The  clock  error  ranged from -11.2 to 11.3 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       =    07
    SUSIM     =    01
    PEM       =    01
    HALOE     =    03
    HRDI      =    02


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

    FOT  =    05

Two  (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

Five  (5) 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 patch to the Eclipse scripting executable (CECIL.exe) was
installed on the operational servers on 28 August 2003.  This was done
to correct for the error found in certain IF and WAIT statement
combinations.  Since the installation, no occurrences of the problem
have been seen.


                               MEETINGS


-None this report period


                       FUTURE SIGNIFICANT EVENTS

The  next  UARS Yaw slew is scheduled for 03 October 2003  (DOY  276).
This  maneuver will be a Forward to Reverse Flight maneuver  (Northern
Hemisphere viewing).


Attachments:   Appendix A,     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 05 September 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
65473   242/1235   03-227   SUSIM       POWER ON (COMPLETE)
65488   243/1331   03-228   PEM         POWER ON ZEPS/NEPS DAY-OPS
65493   243/2038   03-229   OBC/CLK     CLK ADJ FT 0.0 TO -20.6 MSEC/DAY
65503   244/1328   03-230   HALOE       POWER ON
65506   244/1740   03-231   HALOE       POWER ON - PART 2
65511   245/0127   03-232   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
65514   245/0646   03-233   HRDI        F/T TO DAY ONLY (LOW POWER)
65519   245/1406   03-234   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65520   245/1549   03-235   HRDI        FULL-TIME OPERATIONS
65532   246/1142   03-236   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65534   246/1403   03-237   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
65550   247/1547   03-238   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
65554   247/2157   03-239   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65569   248/2155   03-240   HALOE       ADJUST SR AZIMUTH POSITION



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 05 September 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 05 September 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
65493          243/2038               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
65511          245/0127               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
65519          245/1406               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65532          246/1145               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65534          246/1403               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
65550          247/1549               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
65554          247/2207               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY




                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 05 September 2003

     29 August 2003 - GMT Day 241 Beta = 06.9 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/-4.62  +00.0/-50.0  07.2      0.000    0.0
2     +11.2/-44.8  +5.47/+4.51  +28.0/-50.0  25.1      0.970   20.6
3     +22.4/-67.2  +4.19/+3.23  +27.2/-50.0  25.0      0.970   20.3


     05 September 2003 - GMT Day 248 Beta = 34.8 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.  -3.05/-4.31  +00.0/+00.0  07.2     0.000     0.0
2     +11.2/-140.0 +5.79/+4.51  +27.6/-15.2  24.3     1.030    21.2
3     +11.2/-112.0 +4.83/+3.87  +27.2/-15.2  24.3     1.020    21.0

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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 05 September 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-037    FOT       65488     243/1331  30832     Generic Late Acquisition
03-046    FOT       65500     244/0722  30832     Generic Late Acquisition
03-046    FOT       65511     245/0213  30832     Generic Late Acquisition
03-046    FOT       65516     245/1004  30832     Generic Late Acquisition
03-047    FOT       65554     247/2157  33666     Late Acquisition


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-037    FOT       See List  August 03 30832     Generic Late Acquisition
03-045    FOT       65382     236/1124  N/A       Telemetry hits/load abort

                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
------    ------    -----     ----      ---       -----------------
03-046    FOT       See List  September 0330832   Generic Late Acquisition
03-047    FOT       65554     247/2157  33666     Late Acquisition