UARS Weekly Status Report

24 January 2003




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                UARS WEEKLY STATUS REPORT - 24 Jan 2003

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

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

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

This past week, SUSIM successfully gathered all of its daily 1.1 nm
(mid) resolution MgII, and pointing offset solar scans during
periods of predicted UARS telemetry.  The occultation scans of
Tuesday, Jan. 21, were only partially successful; we will try them
again soon.

***********
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 1995365 has been 
reprocessed.

     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 
***********

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
***********

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.

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

Nothing received.
                  
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FOT
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                           REPORTING PERIOD

This  report covers 11 January 2003 (Orbit 61992, GMT Day 011) through
17 January 2003 (Orbit 62096, GMT Day 017).


                         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           012/1339      62015     POWER ON - AXIS 1 & 2
       WINDII        015/2242      62066     POWER OFF
       HALOE         016/1148      62074     POWER ON


The  beta  angle  ranged between the angles of 70.2  degrees  to  44.5
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 1.57 to 1.90 degrees C.  Additional
battery performance data for each battery on 10 January and 17 January
2003 are provided in Appendix D.

The  clock  error  ranged from -10.0 to 07.6 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       =    02
    PEM       =    01
    WINDII    =    01
    HALOE     =    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 an 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.

The FOT also welcomed back the Education Outreach students on 13
January 2003.  The students have begun their second semester of
training and will be divided among ERBS/UARS/TOMS after their
evaluation on 07 February 2003.


                               MEETINGS


The FOT attended TDRS naming convention meeting on 14 January 2003  to
discuss  the  impacts of the new longitudinal names of TDRS  East  and
West.

The  FOT  also  attended  a weekly meeting at Capitol  College  on  17
January 2003 for the SOI Students to discuss openly any questions they
may have encountered in their studies.


                       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 17 January 2003


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
61997   011/0907   03-008   OBC/CLK     CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
62015   012/1339   03-009   PEM         POWER ON - AXIS 1 & 2
62016   012/1432   03-009   PEM         POWER ON - AXIS 1 & 2 (COMPLETED)
62065   015/2053   03-010   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62066   015/2242   03-011   WINDII      POWER OFF
62074   016/1148   03-012   HALOE       POWER ON
62093   017/1731   03-013   SUSIM       TIMING COMMANDS



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 17 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 17 January 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
61997          011/0908               CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
62065          015/2055               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 17 January 2003

     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


     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


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



                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 17 January 2003

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

                 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
03-002    FOT       62035     013/2022  32101     18 sec data dropout