UARS Weekly Status Report

23 January 2004




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                UARS WEEKLY STATUS REPORT - 23 January 2004

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

In support of the yaw around maneuver this week, SOLSTICE began daytime 
only operations on Wednesday. This limits but does not eliminate our 
solar observations as we are powered off during orbit night. We 
received nearly 53% of each day's data amounting to 380 minutes of 
solar observing time per day.

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

Nothing received.

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PEM
***********

     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 2003149 has been 
reprocessed and archived at the GSFC DAAC.

     Level 2 PEM MEPS data file documentation is complete and submitted to 
the DAAC.  MEPS data files are version 1.  Processed MEPS data files at the 
DAAC archive are between 1991274 and 1993039.  

     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.

     The PEM data from the GUVI conjunction periods may be found at 
http://wwwpem.space.swri.edu/guvi-pem.html.


*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 attended the 3-TDRSS Status Review meeting held on
22 January 2004.

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 10 January 2004 (Orbit 67465, GMT Day 010) through
16 January 2004 (Orbit 67570, GMT Day 016).


                         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
       HALOE         010/0004      67465     POWER OFF
       HALOE         010/0456      67468     POWER ON
       PEM           012/2210      67509     AXIS 1 POWER OFF


The  beta  angle  ranged between the angles of 45.2  degrees  to  17.5
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 20 January 2004 (DOY 020).

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 09 January and 16 January
2004 are provided in Appendix D.

The  clock  error  ranged from 14.4 to -10.5 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
    HALOE     =    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 one error that was seen in this first DITL (Day-In-The-Life), was
analyzed and found to be a minor configuration problem not a result of
the patch.  Therefore, the DITL was considered a success and will be
run one more time before the end to end, just to double check our
results.  The end-to-end test will be conducted next week on 21
January 2004.


                               MEETINGS


The FOT attended the UARS 3 TDRS Status Meeting on 15 January 2004  to
discuss  the  status of the remaining activities  and  decide  on  the
actual uplink day.  It was decided at this meeting to hold the ORR  on
27  January  2004 and uplink the FSW patch on 28 January  2004.   This
schedule  has  since been changed and the new ORR date is  29  January
2004 with the uplink scheduled for 04 February 2004.


                                   
                       FUTURE SIGNIFICANT EVENTS

The  next  UARS Yaw slew is scheduled for 20 January 2004  (DOY  020).
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 16 January 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
67465   010/0004   04-012   HALOE       POWER OFF
67468   010/0456   04-013   HALOE       POWER ON
67472   010/1046   04-014   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
67509   012/2210   04-015   PEM         AXIS 1 POWER OFF



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 16 January 2004

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 16 January 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
67472          010/1046               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 16 January 2004


     09 January 2004 - GMT Day 009 Beta = 47.9 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/-4.94  +00.0/+00.0  07.0     0.00      0.0
2     +78.4/-22.4  +5.14/+3.87  +26.0/-15.2  25.4     1.04     19.6
3     -05.6/-151.2 +3.87/+2.60  +24.8/-15.2  25.3     1.03     19.1




     16 January 2004 - GMT Day 016 Beta = 17.5 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    -700.0/-700.0 -3.36/-4.63  +00.0/+00.0  07.0     0.00      0.0
2     +39.2/-22.4  +5.79/+4.50  +29.6/-14.4  25.8     1.03     20.6
3     +11.2/-112.0 +4.50/+3.23  +28.8/-14.4  25.8     1.02     20.0


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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 16 January 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-001    FOT       67491     011/1655  30832     Generic Late Acquisition
04-001    FOT       67516     011/1005  30832     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-002    FOT       67439     008/0643  34715     Downlink failover at WS

                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
------    ------    -----     ----      ---       -----------------
04-001    FOT       See List  Jan 04    30832     Generic Late Acquisition