UARS Weekly Status Report

04 July 2003




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                UARS WEEKLY STATUS REPORT - 04 July 2003

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

Nothing received.

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

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

SUSIM will perform a major, "yearly" (4 lamp) calibration next week
(July 7 through July 11).  We also plan to change in the last,
fresh, MgF2 filter to improve the signal to noise characteristics in
the daily scans of the short wavelength (FUV) portion of the
spectrum.  This should improve our Traceability Mission comparisons
with TIMED/SEE and SORCE SOLSTICE, especially for the high (0.15 nm)
resolution scans.

***********
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 2002029 has been 
reprocessed and archived at the GSFC DAAC.  HEPSA data files for 2002030
through 2002079 are awaiting archiving at the GSFC 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.

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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 21 June 2003 (Orbit 64412, GMT Day 172) through  
27 June 2003 (Orbit 64517, GMT Day 178).


                         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        173/1655      64438     POWER ON
       WINDII        173/1806      64439     POWER OFF
       PEM           176/1425      64499     POWER ON AXIS 1 & 2


The  beta  angle  ranged between the angles of 24.5  degrees  to  52.3
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 80 degrees on 06 July 2003 (DOY 187).

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 1.27 degrees C.  Additional
battery performance data for each battery on 20 June and 27 June  2003
are provided in Appendix D.

The  clock  error  ranged from -7.0 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       =    01
    WINDII    =    02
    PEM       =    01



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

    FOT  =    02

One  (1) Anomaly Report 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 new release of the Eclipse software (Build 2.0.2) was installed on
the operational servers on 26 June 2003.  No problems have been
encountered since switching to the new release this week.


                               MEETINGS


The  FOT  attended the weekly UARS DRB on 24 June 2003, to review  the
open  DRs  and  discuss  the installation plan  for  the  new  Eclipse
software delivery.


                       FUTURE SIGNIFICANT EVENTS

The  next UARS Yaw slew is scheduled for 26 July 2003 (DOY 207).  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 27 June 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
64438   173/1655   03-154   WINDII      POWER ON
64439   173/1806   03-155   WINDII      POWER OFF
64481   176/1425   03-156   PEM         POWER ON AXIS 1 & 2
64499   177/1756   03-157   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 27 June 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 27 June 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
64499          177/1756               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 27 June 2003

     20 June 2003 - GMT Day 171 Beta = 20.6 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   +11.2/-39.2   +5.15/+3.23  +28.0/-14.8  24.8     1.020    18.9
3   +22.4/-44.8   +3.87/+2.60  +27.2/-14.4  24.8     1.010    18.6


     27 June 2003 - GMT Day 178 Beta = 52.3 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  -700.0/-700.0  -3.68/-4.94  +00.0/-00.0  07.2     0.000     0.0
2   +00.0/-89.6   +4.50/+3.23  +24.0/-14.0  25.6     1.020    19.1
3   +22.4/-22.4   +3.55/+2.28  +23.2/-13.6  25.6     1.020    18.8

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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 27 June 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-027    FOT       64439     173/1806  30832     Generic Late Acquisition
03-027    FOT       64439     178/2155  30832     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
-None this report period.

                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
------    ------    -----     ----      ---       -----------------
03-027    FOT       See List  June 03   30832     Generic Late Acquisition