UARS Weekly Status Report

03 October 2003




********************************************************************

                UARS WEEKLY STATUS REPORT - 03 Oct 2003

********************************************************************

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

On Wednesday (2003/274) SOLSTICE began daylight only operations in 
support of the yaw maneuver. This week we collected about 350 minutes of 
solar observations and 50% of the day's data. SOLSTICE is operating in 
good health.

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

SUSIM was turned off after its scans on October 1.  Otherwise, the
instrument successfully gathered all of its daily mid resolution, weekly
offset, and O2 occultation scans during periods of UARS telemetry or
periods of onboard tape recording.

***********
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 2002259 has been 
reprocessed and archived at the GSFC DAAC.  HEPSA data files from 2002160 
through 2002299 are processed and awaiting archiving at the 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.

***********
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.

The MPG participated in a meeting on 2 October which was
held to discuss progress current of the effort to modify UARS
ground station and flight software so that UARS can use 
3 TDRS satellites each orbit.

The UARS Operations Calendar for 2004 (WORD, PDF version) is posted 
on the UARS Science Home Page (http://umpgal.gsfc.nasa.gov)
under the heading "Publications."  This calendar includes:  
day of year, UARS day, predicted solar beta angles (from 
18-month orbit parameter profile prepared on 18 August 2003),
and predicted dates for yaw maneuvers.

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

Nothing received.
                  
***********
FOT
***********

                           REPORTING PERIOD

This  report  covers  20 September 2003 (Orbit  65781,  GMT  Day  263)
through 26 September 2003 (Orbit 65885, GMT Day 269).


                         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
       HALOE         263/1255      65789     POWER ON
       HRDI          269/0916      65849     POWER OFF / LOW POWER


The  beta  angle  ranged between the angles of 52.4  degrees  to  32.9
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 03 October 2003 (DOY 276).

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  19  September  and  26
September 2003 are provided in Appendix D.

The  clock  error  ranged from -10.6 to 09.6 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
    HALOE     =    01
    HRDI      =    01


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

    FOT  =    01

One  (1) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

One  (1)  operational support problem 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 continues to move forward with the 3 TDRS implementation.
This week the FOT worked on OBCSTF to begin the process of updating
the database for the required system table changes.  The database
changes must be made in order to update the database on the CMS.  Once
this is done and the database is put onto the CMS, then testing of the
new CMS software can begin.


                               MEETINGS


-None this report period



                       FUTURE SIGNIFICANT EVENTS

The  next  UARS Yaw slew is scheduled for 03 October 2003  (DOY  276).
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 26 September 2003

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
65789   263/1255   03-253   HALOE       POWER ON
65831   266/0808   03-254   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65849   267/1244   03-255   OBC/CLK     CLK ADJ FT 20.6 TO 0.0 MSEC/DAY
65877   269/0916   03-256   HRDI        POWER OFF / LOW POWER



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 26 September 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 26 September 2003

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
65831          266/0811               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65849          267/1310               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 26 September 2003

     19 September 2003 - GMT Day 262 Beta = 55.2 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/-4.62  +00.0/+00.0  07.2     0.000     0.0
2     +11.2/-22.4  +4.51/+3.23  +23.2/-15.2  25.8     1.040    19.2
3     +16.8/-44.8  +3.23/+2.29  +22.4/-15.2  25.6     1.030    18.9


     26 September 2003 - GMT Day 269 Beta = 32.9 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 -3.05/-3.99  +00.0/+00.0  07.2     0.000     0.0
2     +16.8/-33.6  +5.79/+4.50  +28.0/-15.2  25.4     1.020    19.9
3     +22.4/-44.8  +4.50/+3.23  +27.2/-15.2  25.4     1.020    19.5




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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 26 September 2003

                     NEW ANOMALY REPORTS GENERATED
AR NO.   SUBSYS    ORBIT    TIME      CDS      PROBLEM/DATA LOSS
------   ------    -----    ----      ---      -----------------
03-046   FOT       65815    265/0732  30832    Generic Late Acquisition


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.   SUBSYS    ORBIT    TIME      CDS      PROBLEM/DATA LOSS
------   ------    -----    ----      ---      -----------------
03-049   FOT       65723    259/0326  33745    Generic Drop out on the return

                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
------   ------    -----    ----      ---      -----------------
03-046   FOT       See List Sept 03   30832    Generic Late Acquisition