UARS Weekly Status Report

04 January 2002




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

                UARS WEEKLY STATUS REPORT - 04 Jan 2002

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

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

SOLSTICE continues normal operations, taking solar data on all available
orbital tracking periods. We concur with SUSIM's request that the SSPP
be placed in closed loop solar pointing mode and have begun making only
solar observations.

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

SUSIM completed daily mid resolution and MgII solar scans during
periods of predicted UARS telemetry.

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

Nothing received.

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

Nothing received.

***********
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 
continue.  However, a hardware failure at GSFC caused an 
interruption of DECNET communications from the Remote 
Analysis Computers to the CMS for four days.  To work 
around this problem, several daily activity plans were 
edited and entered manually on the CMS while others 
were emailed to the MPG RAC via TCP/IP and then
transferred to the CMS when DECNET was restored.  The
distribution of Sun Plans from the FOT to solar instruments
was also interrupted causing delays in the activity 
plan preparation by those instruments.

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

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

REPORTING PERIOD

This report covers 15 December 2001 (Orbit 56103, GMT Day 349)
through 21 December 2001 (Orbit 56206, GMT Day 355).

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        349/1236   56110      Power ON            
     PEM AXIS     351/0107   56133      Power ON (14 WATTS) 
     HALOE        354/2324   56192      Power OFF
     

The beta angle ranged between the angles of 30.94 degrees to
14.46 degrees for this report period.  The beta angle is now
decreasing towards a minimum angle of 0 degrees on 25 December
2001 (DOY 359).

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 25.5 V end-of-night (EON)
load bus voltage.  Battery temperatures are stable with a
temperature delta between Battery 2 and Battery 3 of 0.66 to 
1.31 degrees C.  Additional battery performance data for each
battery on 08 December 2001 and 14 December 2001 are provided in
Appendix D.

The clock error ranged from 
8.0 to 0.9 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  =    0
     HALOE     =    2
     PEM/AXIS  =    1


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

     FOT  =    2

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

TRANSPONDER FREQUENCIES:
 Transponder A:  01/333  - 2287.496855
 Transponder B:  01/324  - 2287.498688

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). This service should resume soon.


OTHER SIGNIFICANT EVENTS


UARS SATELLITE OPERATIONS


The FOT conducted a test on 19 December 2001 with the new DSMC in
White Sands which is scheduled to replace NCC.  The testing
included communication test messages, user performance data 
and GCMRs for both SSA and MA supports.  All configurations and
commands worked properly and no future tests are planned at this
time.


Friday, 21 December 2001 turned out to be a very successful day
for UARS.  The Eclipse prototype system was successfully moved to
the Closed I/O net and established a link to the simulator
through the new TAC system.  The first NOOP was sent to the
simulator and was verified by telemetry.  Hundreds of NOOPs were
sent subsequent to the first NOOP, and all worked properly.  This
was a very big step in the Eclipse transition process and the FOT
would like to thank all those involved in making this possible.

Also, on this day the FOT received word that the mini-CDHF was
online and should be ingesting UARS data again in order to
produce plots.  After some minor print queue problems were
corrected the FOT was able to receive plots once again.  This was
a very welcomed success after almost three months without any
trending capability.


MEETINGS

The FOT attended a UARS Eclipse Weekly on Monday, December 17,
2001.

The FOT attended a UARS Eclipse Working Meeting on Thursday,
December 20, 2001.

FUTURE SIGNIFICANT EVENTS


The next UARS Yaw slew is scheduled for 24 December 2001 (DOY
358).  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 21 December 2001

ORBIT     AOS       NO.       SUBSYS    REASON
-----     ---       ---       ------    ------
56110     349/1236  01-728    HALOE     Power ON            
56133     351/0107  01-729    PEM AXIS  Power ON (14 WATTS) 
56192     354/2324  01-730    HALOE     Power OFF           
          



APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 21 December 2001

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 21 December 2001

CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME      CLOCK RATE CHANGE
-----     -----     -----------------
-None this report period.



APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 21 December 2001


     15 December 2001 - GMT Day 349 Beta = 30.94 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   -560.0/-728.0 -3.16/-4.38  +0.0/-0.0   10.72  0.000    0.00
2   +000.0/-504.0 +5.47/+4.48 +28.4/-12.8  25.72  1.040   18.76
3   +224.0/-112.0 +4.48/+3.82 +27.2/-12.8  25.56  1.040   18.41


     21 December 2001 - GMT Day 355 Beta = 14.46 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   -560.0/-728.0 -3.47/-4.38  +0.0/-0.0   10.72  0.000    0.00
2   +000.0/-224.0 +4.48/+3.82 +28.8/-12.8  26.40  1.020   19.34
3   +224.0/-224.0 +3.17/+2.85 +28.0/-12.8  26.40  1.020   18.87

     V/T LEVEL CHANGES
ORB#      TIME LVL FR-TO
-----     ---- ---------
-no changes    V/T 5


APPENDIX E
UARS ANOMALY REPORTS
Week ending 21 December 2001

NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      TTR     PROBLEM/DATA LOSS
------    ------    -----     ----      ---     -----------------
01-083    FOT       56157     352/1551  24145   Patch Panel/TAC 5
01-084    FOT       56174     353/1913  N/A     New TAC 4 Reboot

     ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      TTR     PROBLEM/DATA LOSS
------    ------    -----     ----      ---     -----------------
01-083    FOT       56157     352/1551  24145   Patch Panel/TAC 5
01-084    FOT       56174     353/1913  N/A     New TAC 4 Reboot

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

OPEN ANOMALY REPORTS
AR NO.    SUBSYS  ORBIT   TIME     TTR   PROBLEM/DATA LOSS
------    ------  -----   ----     ---   -----------------
01-75     FOT    see list Dec 01  14170  Generic Late Acquisition

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

REPORTING PERIOD

This report covers 22 December 2001 (Orbit 56207, GMT Day 356)
through 28 December 2001 (Orbit 56311, GMT Day 362).

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         356/2248   56221  POWER OFF 
     SUSIM       357/2137   56236  POWER OFF 
     PEM AXIS    357/2137   56236  POWER OFF 
     ACRIM       360/1641   56277  POWER OFF/ON   
     SUSIM       361/1318   56290  POWER ON (Begin)    
     PEM         362/0038   56297  ZEPS/HEPS Power On - Day Only
     SUSIM       362/1317   56305  Power On - Complete 

     

A Forward-to-Reverse Yaw Around maneuver (number 105) was
successfully executed in Orbit 56250 beginning 358/18:45:19 and
completing at 358/19:22:29 on 24 December 2001.  The SOLSTICE
instrument was in day only and all other instruments were in
their off or standby mode (including HRDI and PEM).  Due to the
SA position at 269 degrees, the effective night length of the
spacecraft after the maneuver was approximately 57.1 minutes. 
Post maneuver analysis of data indicate that during the Yaw
Around, the end-of-night load bus voltage was 24.9 volts and the
average depths of discharge (DODs) on Batteries 2 and 3 were
approximately 20.16 and 19.81 percent respectively.  The next
(forward-to-reverse) YAW is scheduled for 03 February 2002 (DOY
034).

The beta angle ranged between the angles of 30.94 degrees to
09.68 degrees for this report period.  The beta angle is now
decreasing towards a minimum angle of 0 degrees on 03 February
2002 (DOY 034).

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 26.4 V end-of-night (EON)
load bus voltage.  Battery temperatures are stable with a
temperature delta between Battery 2 and Battery 3 of 0.97 to 1.31
degrees C.  Additional battery performance data for each battery
on 22 December 2001 and 28 December 2001 are provided in Appendix
D.

The clock error ranged from -8.0 to 0.9 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       =    6
     PEM/AXIS  =    3
     SOLSTICE  =    2
     HRDI      =    1
     SUSIM     =    3
     ACRIM     =    1


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

     FOT  =    0

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

TRANSPONDER FREQUENCIES:
* Transponder A:  01/333  - 2287.496855
* Transponder B:  01/324  - 2287.498688

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). This service should resume soon.



OTHER SIGNIFICANT EVENTS


UARS SATELLITE OPERATIONS


Another successful yaw maneuver was executed on 24 December 2001. 
The TAM and FSS configuration continues to work well at
maintaining attitude.  The first FSS residuals after the yaw
maneuver were approximately 400 arc seconds.


The FOT continued its testing with the new TAC systems this week. 
The FOT in conjunction with the TAC developers are still trying
hard to resolve the open issues on the TAC system.  Several more
tests were run in an attempt to isolate the problem without
success.  Only a few tests remain that could give any further
insight into the problem.  These tests will be run next week.

The UARS FOT would also like to wish everyone a Happy New Year
and say thank you for the much appreciated hard work and
determination that everyone has given.



MEETINGS

The FOT attended a UARS Eclipse Working Meeting on Thursday,
December 27, 2001.

FUTURE SIGNIFICANT EVENTS


The next UARS Yaw slew is scheduled for 03 February 2002 (DOY
034).  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 28 December 2001

ORBIT  AOS       NO.      SUBSYS   REASON
-----  ---       ---       ------  ------
56219  356/1950  01-731   OBC/CLK  Clk Adj 0.0 to -20.6 msec/day
56221  356/2248  01-732   PEM      POWER OFF
56236  357/2137  01-733   SOLSTICE TO DAY ONLY OPS
56236  357/2137  01-734   HRDI     TO LOW PWR
56236  357/2137  01-735   SUSIM    POWER OFF
56236  357/2137  01-736   PEM AXIS POWER OFF
56237  358/0026  01-737   OBC/CLK  Clk Adj -20.6 to 0.0 msec/day
56248  358/1807  01-738   ACS      YAW SCRIPT - BEGIN
56248  358/1807  01-739   ACS/TAM  TAM UPDATE MODE DISABLE
56250  358/2005  01-738   ACS      YAW SCRIPT - END
56250  358/2005  01-740   ACS/TAM  TAM UPDATE MODE ENABLE
56277  360/1641  01-741   ACRIM    POWER OFF/ON
56282  361/0039  01-742   SOLSTICE TO FULL TIME OPS
56290  361/1318  01-744   SUSIM    POWER ON (Begin)
56297  362/0038  01-743   PEM ZEPS/HEPS Power On - Day Only
56305  362/1317  01-744   SUSIM    Power On - Complete
                    



APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 28 December 2001

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 28 December 2001

CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME      CLOCK RATE CHANGE
-----     -----     -----------------
56219     356/1950  Clk Adj 0.0 to -20.6 msec/day
56237     358/0026  Clk Adj -20.6 to 0.0 msec/day




APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 28 December 2001


     22 December 2001 - GMT Day 356 Beta = 30.94 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  -560.0/-728.0  -3.47/-4.38   +0.0/ -0.0  10.72  0.000   0.00
2  +000.0/-224.0  +4.48/+3.82   +28.8/-12.8 26.40  1.020  19.34
3  +224.0/-224.0  +3.17/+2.85   +28.0/-12.8 26.40  1.020  18.87


     28 December 2001 - GMT Day 362 Beta = 09.68 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  -560.0/-728.0  -4.08/-4.99   +0.0/ -0.0  10.72  0.000    0.00
2  +056.0/-448.0  +4.48/+3.82   +28.0/-12.8 26.08  1.010   20.16
3  +224.0/-112.0  +3.17/+2.52   +27.2/-12.8 26.08  1.010   19.81

     V/T LEVEL CHANGES
ORB#      TIME   LVL FR-TO
-----     ----   ---------
-no changes      V/T 5



APPENDIX E
UARS ANOMALY REPORTS
Week ending 28 December 2001

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

     ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME TTR  PROBLEM/DATA LOSS
------    ------    -----     ---- ---  -----------------
-None this report period.

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

OPEN ANOMALY REPORTS
AR NO.  SUBSYS  ORBIT     TIME    TTR    PROBLEM/DATA LOSS
------  ------  -----     ----    ---    -----------------
01-75   FOT     see list  Dec 01  14170  Generic Late Acquisition