UARS Weekly Status Report

21 February 2003




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                UARS WEEKLY STATUS REPORT - 21 Feb 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.

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

SUSIM successfully gathered all of its daily mid resolution
and weekly offset and occulation scans during periods of
UARS telemetry.

***********
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 1999365 has been 
reprocessed and archived at the GSFC DAAC.  SwRI is preparing for processing
HEPSA data from the year 2000.

     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.

DECNET communications between the UARS Command Management 
System (CMS) and the Remote Analysis Computers (RACs) of 
HALOE, HRDI and SUSIM have not yet been restored. Trouble-
shooting continues, and a defective cable has been 
replaced.  HALOE, HRDI, and SUSIM need to continue
submitting their daily activity plans (DAPs) and 
microprocessor loads (MPLs) via email to the MPG where a 
work around procedure is used to add these DAPs and MPLs 
to the CMS data base.

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

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

                           REPORTING PERIOD

This report covers 08 February 2003 (Orbit 62413, GMT Day 039) through
14 February 2003 (Orbit 62517, GMT Day 045).


                         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
       WINDII        044/2308      62502     POWER OFF


The  beta  angle  ranged between the angles of 37.0  degrees  to  43.1
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 1.59 to 1.60 degrees C.  Additional
battery  performance  data for each battery  on  07  February  and  14
February 2003 are provided in Appendix D.

The  clock  error  ranged from -10.4 to 10.3 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       =    03
    HALOE     =    01
    WINDII    =    01


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

    FOT  =    00

One  (1) 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


During the re-investigation of the OBC Halt Anomaly the FOT found that
during the anomalous pass, the HRDI load was sent with 30 additional
commands pre-pended to the load.  A bit bust of these commands showed
that one of these commands was a Select Fixed Bank 13 command, which
immediately brought the OBC offline.  These commands were generated by
Eclipse due to a bug in the "cmdprt.exe" code.  The bug has been fixed
and a patch was tested and installed on the operational systems on 11
February 2003.  The FOT is now in the process of revising the Anomaly
Investigation Report.


                               MEETINGS


The  FOT attended a telecon with the Raytheon Development team  on  11
February  2003  to discuss the software bug and possible  enhancements
that  can  prevent  future similar events.  The team  decided  that  a
checksum  process would be added before the load is  sent  out.   This
process  will compare the Eclipse post command processed load checksum
to  the  initial converted CMS load file checksum.  If these checksums
do  not  agree then the load will not be sent.  No timeframe has  been
given as to when this functionality will be in place.



                       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 14 February 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
62429   040/0248   03-036   HALOE       ADJUST AZ AND EL POSITIONS
62436   040/1304   03-037   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62456   041/2054   03-038   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62502   044/2308   03-039   WINDII      POWER OFF
62512   045/1403   03-040   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 14 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 14 February 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
62436          040/1311               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62456          041/2059               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62512          045/1412               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY




                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 14 February 2003

     07 February 2003 - GMT Day 038 Beta = 34.6 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  -168.0/-190.4  -3.05/-4.31  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-112.0  +5.79/+4.83  +28.8/-15.2  24.5     1.040    21.0
3   +22.4/-67.2   +5.15/+3.87  +28.4/-16.0  24.5     1.030    20.7


     14 February 2003 - GMT Day 045 Beta = 43.1 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  -168.0/-190.4  -3.05/-4.31  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-39.2   +5.47/+3.87  +26.8/-15.2  25.8     1.020    20.4
3   +22.4/-33.6   +4.51/+2.92  +25.6/-14.8  25.8     1.020    20.2


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





                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 14 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       62393     037/1640  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