UARS Weekly Status Report

17 January 2003




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                UARS WEEKLY STATUS REPORT - 17 Jan 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.

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

SUSIM successfully gathered all of its daily 1.1 nm (mid) resolution
and MgII solar scans this past week during periods of predicted UARS
telemetry.

For Tuesday, Jan. 21, we have planned a series of molecular oxygen
occultation scans at 141, 160, and 170 nm, the first of these done
since 1999.

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

Nothing received.

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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 1994365 has been 
reprocessed.  PEM HEPSA data from 1995001 through 1995069 is waiting for DAAC 
archive.

     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.

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HALOE 
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Nothing received.

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MLS
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Nothing received.

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HRDI
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Nothing received.

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WINDII
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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.

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

Nothing received.
                  
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FOT
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                           REPORTING PERIOD

This  report covers 04 January 2003 (Orbit 61887, GMT Day 004) through
10 January 2003 (Orbit 61991, GMT Day 010).


                         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
       HRDI          004/0223      61888     DAY-ONLY OPS
       HRDI          007/0153      61933     FULLTIME OPS


The  beta  angle  ranged between the angles of 69.6  degrees  to  76.7
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 27 January 2003 (DOY 027).

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 1.26 to 1.64 degrees C.  Additional
battery performance data for each battery on 03 January and 10 January
2003 are provided in Appendix D.

The  clock  error  ranged from -10.3 to 10.4 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
    HRDI      =    02


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

    FOT  =    02

Three  (3)  Anomaly  Reports remained OPEN at the end  of  this  report
period (see Appendix E).


                        GROUND SYSTEM OPERATION

Two  (2)  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 still finishing up some clean up activities from the OBC
Halt anomaly.  These activities include editing the clock correlation
procedure and rewriting some safehold recovery procedures.  The FOT
has also added the MODE3I flag change needed in the UFLTR
reinitialization procedure.


                               MEETINGS


The  FOT  attended  an FDF product meeting on 06  January  2003.   The
purpose  of  this  meeting was to discuss eliminated or  reducing  the
frequency of the FDF products delivered to UARS/ERBS/TOMS.

The  Monthly  Status Review was held on 07 January 2003  in  order  to
review the activities for UARS last month and future plans.



                       FUTURE SIGNIFICANT EVENTS


The  students  will  be returning to the control  center  starting  13
January 2003.


The  next  UARS Yaw slew is scheduled for 27 January 2003  (DOY  027).
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 10 January 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
61888   004/0223   03-001   HRDI        TO DAY-ONLY OPS
61901   004/2221   03-002   OBC/CLK     CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
61917   006/0036   03-003   PEM         AXIS POWER OFF
61928   006/1855   03-004   SADDE       SADDE SAFEHOLD OFF
61933   007/0153   03-005   HRDI        TO FULLTIME
61936   007/0734   03-006   OBC/CLK     CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
61963   009/0149   03-007   OBC/CLK     CLK ADJ FR 20.6 TO 41.2 MSEC/DAY



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 10 January 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 10 January 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
61901          004/2224               CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
61936          007/0753               CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
61963          009/0154               CLK ADJ FR 20.6 TO 41.2 MSEC/DAY




                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 10 January 2003

     03 January 2003 - GMT Day 003 Beta = 67.9 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  -156.8/-179.2  -3.05/-4.63  +00.0/+00.0  08.3      0.000     0.0
2   +11.2/-22.4   +3.87/+2.60  +20.4/-15.2  26.4      1.040    16.9
3   +16.8/-22.4   +2.91/+1.65  +19.6/-15.2  26.4      1.040    16.7


     10 January 2003 - GMT Day 010 Beta = 76.7 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  -162.4/-179.2  -2.11/-3.68  +00.0/+00.0  08.3      0.000     0.0
2   -05.6/-33.6   +2.91/+1.65  +16.0/-15.2  27.0      1.100    12.9
3   +11.2/-22.4   +2.28/+1.34  +15.6/-14.4  27.0      1.090    12.6


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




                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 10 January 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-002    FOT       61930     003/2118  30832     Generic Late Acquisition
03-003    FOT       61935     007/0515  30832     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-058    FOT       61113     317/1341  N/A       NEG ACQ / UFLTR ERROR
02-059    FOT       61797     363/0021  30832     Generic Late Acquisition

                ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO.   SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-058    FOT       61113     317/1341  N/A       NEG ACQ / UFLTR ERROR

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-060    FOT       61421     338/0057  N/A       PSU Cmd Clock Timeout
03-002    FOT       61930     003/2118  30832     Generic Late Acquisition
03-003    FOT       61935     007/0515  30832     Generic Late Acquisition