UARS Weekly Status Report

11 October 2002




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                UARS WEEKLY STATUS REPORT - 11 OCT 2002

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

Nothing received.

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

SUSIM successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.

Today 10/11/02 marks the 11th year of SUSIM's observations,  SUSIM has now 
collected data for an entire solar cycle.

***********
ACRIM
***********

Nothing received.

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

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.  A
presentation will be made at the November American Meteorological Society 
meeting on PEM's view of the first conjunction period.  PEM has seen no aurora 
during the second conjunction period.

PEM data for a third GUVI-PEM conjunction has been planned.  This time
period is October 27.  Orbit analysis shows that conjunctions will occur 
between TIMED and UARS at 11:03 UT (IL = 65 deg, MLT = 20 hr, GeoLat = -51 deg,
GeoLon = 132 deg) and 11:50 UT (IL = 61 deg, MLT = 8 hr, GeoLat = 52 deg,
GeoLon = 295 deg).

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 to support re-engineering of the UARS
Mission Operations Concept to develop capabilities for the
Science Traceability Mission.

Daily processing of instrument Daily Activity Plans continues
with no problems.

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

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

                           REPORTING PERIOD

This  report  covers  28 September 2002 (Orbit  60414,  GMT  Day  271)
through 04 October 2002 (Orbit 60534, GMT Day 277).


                         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           272/1303      60437     POWER ON AXIS 1
       HRDI          276/1835      60500     TO DAY ONLY MODE

The  beta  angle  ranged between the angles of 43.6  degrees  to  27.1
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 10 October 2002 (DOY 283).

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 0.97 degrees C.  Additional
battery  performance  data for each battery on  28  September  and  04
October 2002 are provided in Appendix D.

The  clock  error  ranged from -12.6 to 10.4 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
    HRDI      =    01


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

    FOT  =    00

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


                        GROUND SYSTEM OPERATION

Zero  (0) 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 hard disk on the prototype was installed this week.  The new
build of the Eclipse software has also been installed and can now be
tested.  Once the testing is completed the software can be released
for operations.  This will most likely not take place until the ERBS
integration is complete.


The FOT is also working hard in preparation for the college students
that will be in the control center to learn about spacecraft
operations.  The FOT will try to formulate training materials and
structure a learning plan to teach the students.  This is all part of
the new Educational Outreach initiative/contract, which started on
October 1, 2002 for both UARS and TOMS.


                               MEETINGS


-     The  FOT  attended the UARS Monthly Status review on 03  October
  2002.





                       FUTURE SIGNIFICANT EVENTS


The  next  UARS Yaw slew is scheduled for 10 October 2002  (DOY  283).
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 04 October 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
60437   272/1303   02-340   PEM         POWER ON AXIS 1
60475   275/0237   02-341   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
60494   276/0820   02-342   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
60500   276/1835   02-343   HRDI        TO DAY-ONLY MODE
60501   276/2016   02-344   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
60519   277/2351   02-345   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 04 October 2002

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 04 October 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
60475          275/0241               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
60494          276/0822               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
60501          276/2016               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
60519          277/2353               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY















                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 04 October 2002

     27 September 2002 - GMT Day 270 Beta = 49.7 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  -145.6/-11.2 -3.68/-4.63   +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-50.4 +5.14/+3.23   +24.4/-15.2  25.0     1.030    19.8
3   +22.4/-33.6 +3.87/+2.60   +24.0/-15.2  25.0     1.040    19.3


     04 October 2002 - GMT Day 277 Beta = 27.1 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  -140.0/-168.0 -3.05/-4.31  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-89.6  +5.15/+4.19  +28.8/-15.2  24.8     1.030    21.0
3   +22.4/-67.2  +4.19/+3.23  +28.0/-15.2  24.8     1.020    20.5


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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 04 October 2002

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
-None this report period.

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-050    SOLSTICE  60336     265/2037  N/A       SOLS UNEXPECTED STATE

                ANOMALY INVESTIGATION REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
-None this report period.

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-051    FOT       60366     267/1951  30832     GENERIC LATE ACQUISITION
02-052    SOLSTICE  60366     267/1951  N/A       LOADING PROBLEM