UARS Weekly Status Report

31 January 2003




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             UARS WEEKLY STATUS REPORT - 31 January 2003

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

In support of the yaw maneuver this week, SOLSTICE was in day only operations, 
taking the default solar observations.  Otherwise, SOLSTICE continues to 
operate normally, taking solar data on all available orbital tracking periods.

The SORCE satellite was launched on Saturday January 25th taking with it the 
next generation SOLSTICE instrument. We look forward to analyzing this overlap 
data and continuing these long term solar measurements.

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

SUSIM was turned off January 26-29; scans were missed for January
27-29. Otherwise, SUSIM successfully gathered all of its daily 1.1
nm (mid) resolution MgII, and pointing offset solar scans during
periods of predicted UARS telemetry.  Another set of sunrise
occultation scans have been scheduled for next week.

***********
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 1996220 has been 
reprocessed and archived at the GSFC DAAC.  HEPSA data between 1996221 and 
1996366 is waiting to be archived 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 18 January 2003 (Orbit 62097, GMT Day 018) through
24 January 2003 (Orbit 62202, GMT Day 024).


                         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
       PEM           021/2158      62156     AXIS Power OFF


The  beta  angle  ranged between the angles of 43.3  degrees  to  14.0
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 1.27 to 1.29 degrees C.  Additional
battery performance data for each battery on 17 January and 24 January
2003 are provided in Appendix D.

The  clock  error  ranged from -11.0 to 10.1 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       =    04
    PEM       =    01
    SUSIM     =    01


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

    FOT  =    01

Two  (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

One  (1)  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 awaiting a new build of the Eclipse ground software, which
is slated to arrive early next week.  This build should correct
several DR issues, most importantly the wait statement problem seen in
the execution of some CECIL procedures.  FOT testing of this build
will begin once the delivery is installed on the UARS prototype
system.


                               MEETINGS


-None this report period


                       FUTURE SIGNIFICANT EVENTS

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 24 January 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
62113   019/0204   03-014   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62130   020/0624   03-015   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62153   021/1641   03-016   SUSIM       TIMING COMMANDS
62156   021/2158   03-017   PEM         AXIS POWER OFF
62169   022/1824   03-018   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62186   023/2228   03-019   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 24 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 24 January 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
62113          019/0209               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62130          020/0628               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62169          022/1825               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62186          023/2230               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 24 January 2003

     17 January 2003 - GMT Day 017 Beta = 44.5 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/-184.8  -3.68/-4.63  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-22.4   +5.46/+3.87  +26.4/-15.2  25.4     1.050    19.8
3   +33.6/-22.4   +4.50/+2.60  +25.6/-14.8  25.4     1.040    19.3


     24 January 2003 - GMT Day 024 Beta = 14.0 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/-184.8  -3.36/-4.94  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-56.0   +5.79/+4.50  +32.1/-14.4  25.3     1.030    21.5
3   +33.6/-22.4   +4.50/+3.23  +28.8/-14.4  25.1     1.020    21.0


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




                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 24 January 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-002    FOT       62102     018/0814  32101     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
03-002    FOT       62035     013/2022  32101     18 sec data dropout

                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
03-002    FOT       62102     018/0814  32101     Generic Late Acquisition