UARS Weekly Status Report

26 September 2003




********************************************************************

                UARS WEEKLY STATUS REPORT - 26 SEP 2003

********************************************************************

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

During this week, SOLSTICE continued to operate in good health gathering 
solar data on all available orbital tracking periods. This week we 
received about 51% of each day's data amounting to about 450 minutes of 
solar observing time 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 2002179, and HEPSA
data between 2002230 and 2002239 has been reprocessed and archived at the GSFC 
DAAC.  HEPSA data files from 2002180 through 2002229 and 2002240 through 2002259
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.

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

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

                           REPORTING PERIOD

This  report  covers  13 September 2003 (Orbit  65675,  GMT  Day  256)
through 19 September 2003 (Orbit 65780, GMT Day 262).


                         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           257/0004      65690     AXIS 1,2 TURN ON
       PEM           262/2341      65780     AXIS 1 & 2 OFF
       WINDII        262/2341      65780     POWER OFF


The  beta  angle  ranged between the angles of 58.3  degrees  to  55.2
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 03 October 2003 (DOY 276).

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 0.94 to 1.29 degrees C.  Additional
battery  performance  data for each battery on  12  September  and  19
September 2003 are provided in Appendix D.

The  clock  error  ranged from -10.0 to 10.7 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       =    04
    PEM       =    03
    WINDII    =    01



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

    FOT  =    03

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


                        GROUND SYSTEM OPERATION

Three  (3) 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 continues to move forward with the 3 TDRS implementation.  The
FOT developed a timeline of all the activities that need to be
completed from all entities involved.  The FOT also gathered
information and analyzed the effect of running the transponder and HGA
in order to support a third pass every orbit.  The next step is to
being making the necessary database changes and then get the backup
CMS ready for testing.


                               MEETINGS


The  FOT attended the UARS Biweekly DRB Meeting on 16 September  2003.
The  FOT discussed the changes need from the Raytheon development team
to  utilize  a three TDRS mode of operations.  These changes  will  be
made and should be delivered by the end of October.

The FOT attended the UARS Three TDRS Meeting on 18 September 2003.  At
this  meeting the FOT presented the proposed timeline and  transponder
and HGA information.  It was decided by the UARS Project Scientist and
the   NASA   Mission  Director  to  continue  to  move  forward   with
implementing  the  three TDRS capability.  The proposed  timeline  has
this activity scheduled for completion by mid to late November.


                       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,              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 September 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
65688   256/2035   03-246   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65690   257/0004   03-247   PEM         AXIS 1,2 TURN ON (BEGIN)
65691   257/0138   03-247   PEM         AXIS 1,2 TURN ON (COMPLETE)
65724   259/0606   03-248   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65751   261/0102   03-249   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65780   262/2341   03-250   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65780   262/2341   03-251   PEM         AXIS 1 & 2 OFF
65780   262/2341   03-252   WINDII      POWER OFF



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

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
65688          256/2035               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65724          259/0609               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65751          261/0121               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65780          262/2345               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 19 September 2003

     12 September 2003 - GMT Day 255 Beta = 56.6 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   07.2     0.000    0.0
2    +16.8/-33.6   +4.51/+2.92  +22.0/-15.2   26.1     1.030   18.6
3    +11.2/-56.0   +3.23/+1.97  +21.6/-14.4   26.1     1.020   17.7


     19 September 2003 - GMT Day 262 Beta = 55.2 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 -3.68/-4.62  +00.0/+00.0   07.2     0.000    0.0
2     +11.2/-22.4  +4.51/+3.23  +23.2/-15.2   25.8     1.040   19.2
3     +16.8/-44.8  +3.23/+2.29  +22.4/-15.2   25.6     1.030   18.9

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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 19 September 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-049    FOT       65723     259/0326  33745     Generic Drop out on the return
03-046    FOT       65765     261/2343  30832     Generic Late Acquisition
03-046    FOT       65770     262/0641  30832     Generic Late Acquisition


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-048    SOLSTICE  65573     249/0454  N/A       SOLSTICE Rebooted

                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  Sept 03   30832     Generic Late Acquisition
03-049    FOT       65723     259/0326  33745     Generic Drop out on the return