UARS Weekly Status Report

27 June 2003




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                UARS WEEKLY STATUS REPORT - 27 JUN 2003

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

Nothing received.

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

SUSIM has successfully gathered all of its daily mid resolution,
weekly offset, and O2 occultation scans this past week during
periods of UARS telemetry or during 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 2001365 has been 
reprocessed and archived at the GSFC DAAC.  HEPSA data files for 2002010
through 2002029 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.

***********
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 14 June 2003 (Orbit 64308, GMT Day 165) through  20
June 2003 (Orbit 64411, GMT Day 171).


                         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
       SOLSTICE      168/1342      64361     POWER ON TO FULLTIME
       SUSIM         168/1521      64362     POWER ON PART 1
       PEM           169/1346      64376     POWER ON DAY ONLY
       HALOE         171/1251      64405     POWER ON PART 1



A Reverse-to-Forward Yaw Around maneuver (number 120) was successfully
executed in Orbit 64317 beginning 165/16:14:06Z and completing at
165/16:51:16Z on 14 June 2003.  All instruments were in their off or
standby mode (except for SOLSTICE in day-only).  Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 55.71 minutes.  Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 25.60 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 21.09 and 20.62 percent
respectively.  The next (forward-to-reverse) YAW is scheduled for 26
July 2003 (DOY 207).

The  beta  angle  ranged between the angles of -04.5 degrees  to  20.6
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 1.27 to 1.92 degrees C.  Additional
battery performance data for each battery on 13 June and 20 June  2003
are provided in Appendix D.

The  clock  error  ranged from -9.6 to 10.6 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
    SOLSTICE  =    01
    SUSIM     =    01
    PEM       =    01
    HALOE     =    02



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

    FOT  =    02

Two  (2) 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


Parallel operations with the new Eclipse Build 2.0.2 and the existing
Eclipse Build 1.5.0 began on 19 June 2003, and will continue into next
week.  If the new Build runs error free during this time then it will
be released for operations.  The tentative date for the switch over is
set for 25 June 2003.


                               MEETINGS


The  FOT  attended the weekly UARS DRB on 17 June 2003, to review  the
open  DRs  and discuss the testing status of 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 20 June 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
64346   167/1345   03-147   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64346   167/1442   03-145   MPS         VT LEVEL-6 TO LEVEL-5
64348   167/1703   03-145   MPS         BATSOC
64361   168/1342   03-148   SOLSTICE    POWER ON TO FULL TIME
64362   168/1521   03-149   SUSIM       POWER ON PART 1
64364   168/1814   03-150   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64376   169/1346   03-151   PEM         POWER ON DAY ONLY
64376   169/1346   03-149   SUSIM       POWER ON
64405   171/1251   03-152   HALOE       POWER ON PART 1
64409   171/1810   03-153   HALOE       POWER ON PART 2


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 20 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 20 June 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
64346          167/1349               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64364          168/1814               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 20 June 2003

     13 June 2003 - GMT Day 164 Beta = 7.9 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  -700.0/-700.0  -3.68/-4.62  +00.0/-50.0  07.2     0.000     0.0
2   +11.2/-95.2   +5.47/+4.51  +26.4/-50.0  23.8     1.020    21.0
3   +22.4/-67.2   +4.51/+3.23  +25.6/-50.0  23.8     1.010    20.5


     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

     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
64316          165/1502   LV5 -> LV6
64346          167/1442   LV6 -> LV5


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 20 June 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-027    FOT       64337     167/0007  30832     Generic Late Acquisition
03-029    FOT       64352     167/2321  32998     Severe Weather 6:14 32K

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-029    FOT       64352     167/2321  32998     Severe Weather 6:14 32K

                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
03-029    FOT       64352     167/2321  32998     Severe Weather 6:14 32K