UARS Weekly Status Report

14 March 2003




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                UARS WEEKLY STATUS REPORT - 14 March 2003

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

SOLSTICE continues to operate normally, taking solar data on all 
available orbital tracking periods.

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

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

SUSIM has been experiencing data integrity problems from files copied
from the CDHF.  Since level 0 files are obtained directly from PACOR-A,
our production processing is not directly affected.

***********
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.  SwRI is working on reprocessing
data PEM for 2003.

     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 01 March 2003 (Orbit 62729, GMT Day 060) through 07
March 2003 (Orbit 62833, GMT Day 066).


                         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
       SUSIM         062/1514      62768     POWER ON
       SOLSTICE      062/1557      62768     DAY ONLY TO FULL TIME
       HALOE         064/1511      62798     POWER ON

A Forward-to-Reverse Yaw Around maneuver (number 117) was successfully
executed in Orbit 62738 beginning 060/14:59:18Z and completing at
060/15:36:28Z on 1 March 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 57.62 minutes.  Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.97 and 20.27 percent
respectively.  The next (reverse-to-forward) YAW is scheduled for 06
April 2003 (DOY 096).

The  beta  angle  ranged between the angles of  2.4  degrees  to  24.9
degrees  for  this  report period.  The beta angle is  now  increasing
towards a maximum angle of 57 degrees on 20 March 2003 (DOY 081).

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 0.96 degrees C.  Additional
battery performance data for each battery on 28 February and 07  March
2003 are provided in Appendix D.

The  clock  error  ranged from -8.3 to 12.1 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       =    02
    SUSIM     =    01
    SOLSTICE  =    01
    HALOE     =    02

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 began 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.  Testing
showed that both the wait statement and status buffer problems had not
been fixed, so the Raytheon development team has been informed and
they will try to give us an updated build as soon as possible.


                               MEETINGS

-None this report period


                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 06 April 2003 (DOY 096).  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 07 March 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
62737   060/1325   03-052   OBC         YAW MANEUVER FWD TO REV
62738   060/1602   03-053   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
62752   061/1334   03-052   PSU         VT LV 6 TO VT LV 5
62768   062/1514   03-054   SUSIM       POWER ON START
62768   062/1557   03-055   SOLSTICE    DAY ONLY TO FULL-TIME MODE
62781   063/1232   03-054   SUSIM       POWER ON
62798   064/1511   03-056   HALOE       POWER ON PART 1
62800   064/1845   03-057   HALOE       POWER ON PART 2





                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 07 March 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 07 March 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
62738          060/1602               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY








                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 07 March 2003

     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


     07 March 2003 - GMT Day 066 Beta = 24.9 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  -168.0/-190.4  -3.05/-4.31  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-56.0   +5.46/+4.50  +28.0/-14.4  25.8     1.020    20.2
3   +28.0/-22.4   +4.50/+3.23  +28.4/-14.4  25.8     1.000    19.9


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
62737          060/1325   LV5 -> LV6
62752          061/1334   LV6 -> LV5



                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 07 March 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
------    ------    -----     ----      ---       -----------------
-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
------    ------    -----     ----      ---       -----------------
02-060    FOT       61421     338/0057  N/A       PSU Cmd Clock Timeout
03-005    FOT       62559     048/1757  32330     CDS Equipment problem