UARS Weekly Status Report

1 October 2004




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                UARS WEEKLY STATUS REPORT - 01 OCT 2004

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

SOLSTICE returned to full time operations on Monday (271) after three 
and a half days of day only operations in support of the yaw maneuver. 
Otherwise, the instrument continues to perform exceptionally, taking 
solar data on all available orbital tracking periods. An average of 52% 
of data were returned this week accounting for 366 minutes of solar 
observing time per day.

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

SUSIM resumed operations on Monday, Sept. 27.  Since then, SUSIM
successfully gathered daily mid (1.1 nm) resolution, MgII, and
continuous monitoring scans during periods of UARS telemetry.

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

     HEPSA data files are version 2.  Currently, HEPSA data between 1991274 
and 2004119 has been reprocessed and archived at the GSFC DAAC.  HEPSA Level 2
data files from 2004120 to 2004139 are processed and waiting for archiving.

     MEPS data files are version 1.  Processed MEPS data files at the 
DAAC archive are between 1991274 and 2004119.  MEPS Level 2 data files from 
2004120 to 2004139 are processed and waiting for archiving.

     PEM continues to receive NMC data files from NOAA.  No problems have
been encountered.

     The PEM data from the GUVI conjunction periods may be found at 
http://wwwpem.space.swri.edu/guvi-pem.html.  The additional electron data for 
the October and November storms of 2003 has been moved and is now located at 
http://climatology.space.swri.edu/uars_fromRudy.html.  For those users of 
SDDAS, update your UARS Meta data and these data times will appear
with full functionality.  Proton data from these storms are now located at
http://climatology.space.swri.edu/UARS_images_from_Rudy_(Apr._2004).html

     Requests have been received for storm spectral data.  Overview plots were 
produced and these plots may be found on the web at
http://climatology.space.swri.edu/UARS_images_postedJune2004.html
for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000, 
March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and 
November 11-12 of 2001.

*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.

***********
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  18 September 2004 (Orbit  71256,  GMT  Day  262)
through 24 September 2004 (Orbit 71360, GMT Day 268).


                         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
       PEM           264/2313      71300     POWER OFF
       PEM           264/2313      71300     AXIS 1 & 2 OFF
       HALOE         265/2348      71315     POWER OFF
       SOLSTICE      267/2306      71345     FULLTIME TO DAY ONLY
       SUSIM         264/2306      71345     POWER OFF



The beta angle ranged between the angles of 23.3 degrees to 4.4
degrees for this report period.  The beta angle is now decreasing
towards a minimum angle of 0 degrees on 25 September 2004 (DOY 269).

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 0.96 to 1.27 degrees C.  Additional
battery performance data for each battery on 17 September and 24
September 2004 are provided in Appendix D.

The clock error ranged from 10.3 to -11.2 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       =    06
    PEM       =    02
    HALOE     =    01
    SOLSTICE  =    01
    SUSIM     =    01


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


The new release of the CMS code continued to undergo testing this
week.  This new release was built to fix the file transfer problem
encountered in the previous build.  The preliminary testing showed the
file transfer issue to be resolved, but the build still requires all
other process testing.  The goal for completion is the end of
September.

The FOT released the new Eclipse software build to operations on 13
September 2004.  This new release took care of several DRs that had
been written against the previous release.  No major issues have been
found and the software has run well since its installation.


                               MEETINGS


The FOT attended the HRDI attitude meeting on 22 September 2004.  At
this meeting a new ground solution method was proposed to try to
provide HRDI with better attitude knowledge for their past data.  This
method will be pursued in conjunction with the current simulations to
better tune the UARS Kalman filter.


                                   
                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 25 September 2004 (DOY 269).
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 24 September 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
71264   262/1444   04-265   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
71272   263/0243   04-266   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71290   264/0744   04-267   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71300   264/2313   04-268   PEM         POWER OFF
71300   264/2313   04-269   PEM         AXIS 1 & 2 OFF
71314   265/2158   04-270   CADH        NOOP XMTR ON (DELETED PASS)
71315   265/2348   04-271   HALOE       POWER OFF
71345   267/2306   04-272   SOLSTICE    FROM FULL TO DAY ONLY FOR YAW
71345   267/2306   04-273   SUSIM       POWER OFF FOR YAW
71353   268/1138   04-274   OBC/CLK     CLK ADJ FR 0.0 TO -20.6  MSEC/DAY
71355   268/1506   04-275   MPS         CMD TO VT L6 FOR YAW



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 24 September 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 24 September 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
71264          262/1449               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
71272          263/0253               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71290          264/0744               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71353          268/1143               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY

                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 24 September 2004

     17 September 2004 - GMT Day 261 Beta = 31.8 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 -3.05/-4.31  +00.0/+00.0  07.0     0.00      0.0
2     -00.0/-078.4 +5.14/+3.87  +27.2/-14.4  25.4     1.03     19.5
3     -11.2/-140.0 +3.87/+2.91  +26.4/-14.4  25.4     1.03     19.2

     24 September 2004 - GMT Day 268 Beta = 04.4 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/-4.94  +00.0/+00.0  07.0     0.00     0.0
2      00.0/-50.4  +4.83/+3.87  +27.2/-12.0  25.9     1.02     19.3
3      11.2/-89.6  +3.87/+2.60  +26.8/-12.0  25.8     1.01     18.9

     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
71355          268/1506   LV5 -> LV6


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 24 September 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-061    FOT       71286     264/0156  36997     Data Dropout
04-062    FOT       71288     264/0418  36998     Data Dropout

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-060    FOT       71177     256/1904  36935     Late Acquisition

                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
------    ------    -----     ----      ---       -----------------
04-061    FOT       71286     264/0156  36997     Data Dropout
04-062    FOT       71288     264/0418  36998     Data Dropout