UARS Weekly Status Report

07 March 2003




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                UARS WEEKLY STATUS REPORT -  7 March 2003

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

This week, SOLSTICE was powered only during daylight for three days to
support the yaw maneuver. Otherwise, solar data were collected on all
available orbital tracking periods.

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

Nothing received.

***********
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 2001229 has been 
reprocessed and archived at the GSFC DAAC.  Files for 2001230 through 2001259
are wating archival 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
***********

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 22 February 2003 (Orbit 62624, GMT Day 053) through
28 February 2003 (Orbit 62728, GMT Day 059).


                         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
       HRDI          054/0502      62641     DAY-ONLY OPS
       ACRIM         054/1602      62648     POWER ON A SIDE
       ACRIM         055/0039      62654     A SIDE OFF/B ON
       PEM           055/2252      62667     AXIS 1 OFF
       HALOE         056/2251      62683     POWER OFF
       ACRIM         057/1333      62692     POWER ON A SIDE
       ACRIM         057/2104      62697     POWER OFF
       PEM           058/2103      62712     POWER OFF ZEPS & NEPS
       SOLSTICE      058/2300      62713     FULLTIME TO DAY ONLY OPS
       SUSIM         058/2300      62713     POWER OFF

The  beta  angle  ranged between the angles of  26.8  degrees  to  6.3
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 01 March 2003 (DOY 060).

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 0.96 degrees C.  Additional
battery  performance  data for each battery  on  21  February  and  28
February 2003 are provided in Appendix D.

The  clock  error  ranged from -10.1 to 9.1 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       =    01
    HRDI      =    01
    ACRIM     =    01
    PEM       =    02
    HALOE     =    01
    SOLSTICE  =    01
    SUSIM     =    01

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

    FOT  =    00

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


                        GROUND SYSTEM OPERATION

Zero  (0) 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 is in the process of testing the new software release of the
Eclipse software (Version 2.1).  This release contains several fixes
in response to DRs written, including wait statement and status buffer
issues.  Due to the extent of the changes made, it may take a few
weeks to perform all the testing needed to get this new build to
operations.


                               MEETINGS

-None this report period


                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060).  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 28 February 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
62641   054/0502   03-044   HRDI        DAY-ONLY OPS
62648   054/1602   03-045   ACRIM       POWER ON A SIDE
62654   055/0039   03-045   ACRIM       A SIDE OFF/B ON
62667   055/2252   03-046   PEM         AXIS 1 OFF
62683   056/2251   03-047   HALOE       POWER OFF
62692   057/1333   03-045   ACRIM       POWER ON A SIDE
62697   057/2104   03-045   ACRIM       POWER OFF
62712   058/2103   03-048   PEM         POWER OFF ZEPS & NEPS
62713   058/2300   03-049   SOLSTICE    FULLTIME TO DAY ONLY OPS
62713   058/2300   03-050   SUSIM       POWER OFF
62718   059/0642   03-051   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 28 February 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 28 February 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
62718          059/0642               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 28 February 2003

     21 February 2003 - GMT Day 052 Beta = 29.7 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  -168.0/-190.4  -3.05/-3.99  +00.0/+00.0  08.3     0.000     0.0
2   +44.8/-22.4   +6.44/+5.15  +28.8/-15.2  23.8     1.040    22.5
3   +22.4/-67.2   +5.47/+4.19  +28.4/-15.6  23.7     1.030    22.0


     28 February 2003 - GMT Day 059 Beta = 6.3 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  -168.0/-196.0  -3.68/-4.94  +00.0/+00.0  08.3     0.000     0.0
2   +16.8/-22.4   +4.51/+3.55  +28.0/-12.8  25.9     1.020    19.9
3   +22.4/-22.4   +3.23/+2.60  +27.2/-12.8  25.9     1.020    19.5


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



                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 28 February 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
------    ------    -----     ----      ---       -----------------
03-004    FOT       62559     051/0916  30832     Generic Late Acquisition
03-004    FOT       62601     051/1208  30832     Generic Late Acquisition

                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
------    ------    -----     ----      ---       -----------------
02-060    FOT       61421     338/0057  N/A       PSU Cmd Clock Timeout
03-005    FOT       62559     048/1757  32330     CDS Equipment problem