UARS Weekly Status Report

02 November 2001




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                UARS WEEKLY STATUS REPORT - 02 Nov 2001

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

SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods and stellar calibration observations
whenever possible. We continue to gather enough data to meet the
SOLSTICE science objectives during this period of reduced tape recorder
operations. Furthermore, we have validated the PACOR-A data transfer
files.

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

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

SUSIM's CDHF reprocessing remains about 200 days short of
completion.

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

Nothing received.

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

***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****

     PEM would like to thank the project for their work on convincing NASA HQ 
to keep UARS alive and operating in campaign mode.  

     The PEM boom instruments were activated on 2001303 at about 22 UT in
full operational mode.

     Tests of PEM Level 0 data transfer to PEM2K:: from PACOR-A succeed; 
however, the file naming convention from PACOR-A is not known.  PEM was 
expecting to receive files using the same naming convention as is used on
the PEM Level 0 data files received from the CDHF.  If anyone knows the
meaning of the PACOR-A file name convention, please inform Sandee Jeffers
at sjeffers@swri.org. 


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

Nothing received.

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MLS
***********

Nothing received.

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HRDI
***********

Nothing received.

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WINDII
***********

Nothing received.

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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 20 October 2001 (Orbit 55261, GMT Day 293) through 26 
October 2001 (Orbit 55366, GMT Day 299).

                        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                293/1317        55269          Power ON (Day-Only)
          HALOE              295/0124        55292          Power ON
          WINDII             297/0811        55326          Power ON

The beta angle ranged between the angles of 11.2 degrees to 36.8 degrees for 
this report period.  The beta angle is now increasing towards a maximum angle 
of 73 degrees on 7 November 2001 (DOY 311).

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 23.8 V end-of-night (EON) load bus voltage.  Battery 
temperatures are stable with a temperature delta between Battery 2 and Battery 
3 of 0.9 to 1.0 degrees C.  Additional battery performance data for each 
battery on 22 October 2001 and 26 October 2001 are provided in Appendix D.

The clock error ranged from Š15.6 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             =  17
„           HALOE           =  01
„           WINDII          =  01
„           PEM             =  01


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

„           FOT             =  05


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

TRANSPONDER FREQUENCIES:
· Transponder A:  01/267  - 2287.496874
· Transponder B:  01/263  - 2287.498962


                            GROUND SYSTEM OPERATION

One (1) operational support problems occurred this period.  Anomaly Reports are 
included in Appendix E.

The data loss calculations supplied by Data Capture Facility (DCF) from mission 
start through UTC Day 01/277 show the observatory data loss to be 303 hours, 18 
minutes, and 28.016 seconds. This shows no change in data loss since the last 
report period. This is a 0.39 percent data loss, which equals a 99.61 percent 
data capture for the mission.


                         OTHER SIGNIFICANT EVENTS

                         UARS SATELLITE OPERATIONS

The FOT has begun the process of implementing RaytheonÕs Eclipse ground system 
and continues to work on the TAC replacement system.  These new systems will 
provide enhanced capability and make up for the loss of some UARS facilities, 
which have been shut down due to budgetary reasons.  This will be a huge effort 
and must be completed as soon as possible in order to provide a low cost method 
for flying UARS.  The FOT will need assistance from all entities involved to 
insure the success of this operation.  The estimated time for completion is 
April 2002.


                                 MEETINGS

The UARS FOT attended an Eclipse-Raytheon All Day Meeting on Tuesday, October 
23, 2001.
The UARS FOT attended a UARS Operational Plan Meeting on Wednesday, October 24, 
2001.
     
                         FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 26 November 2001 (DOY 330).  This 
maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere 
viewing).


Attachments:  Appendix A,  Real-time Commands 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 October 2001

ORBIT        AOS           NO.         SUBSYS       REASON
-----        ---           ---         ------       ------
55269        293/1317      01-637      PEM          Power ON (Day-Only)
55283        294/1135      01-638      OBC          Clk Adj -20.6 to 0.00 msec/day
55288        294/1932      01-639      NBTR         NOOPS D-295
55292        295/0124      01-640      HALOE        Power ON
55297        295/0953      01-639      OBC          NOOPS D-295
55302        295/1749      01-641      NBTR         NOOPS D-296
55311        296/0810      01-641      NBTR         NOOPS D-296
55319        296/2114      01-641      NBTR         NOOPS D-296
55320        296/2254      01-642      NBTR         NOOPS D-297
55326        297/0811      01-642      NBTR         NOOPS D-297
55326        297/0811      01-643      WINDII       Power ON
55332        297/1645      01-644      OBC          Clk Adj 0.00 to 20.6 msec/day
55332        297/1750      01-645      NBTR         NOOPS D-298
55341        298/0811      01-645      NBTR         NOOPS D-298
55349        298/2113      01-646      NBTR         NOOPS D-298
55352        299/0035      01-646      NBTR         NBTR PBK
55352        299/0122      01-647      OBC          Clk Adj 20.6 to 0.00 msec/day
55355        299/0633      01-646      NBTR         NOOPS D-299
55363        299/1930      01-648      NBTR         NOOPS D-300
55364        299/2113      01-648      NBTR         NOOPS D-300

__________________________________________________________________________________

                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 26 October 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 26 October 2001

                       CLOCK DRIFT RATE ADJUSTMENTS

ORBIT           TIME               CLOCK RATE CHANGE
-----           -----              -----------------
55283           294/1140           Clk Adj -20.6 to 0.00 msec/day
55332           297/1647           Clk Adj 0.00 to 20.6 msec/day
55352           299/0125           Clk Adj 20.6 to 0.00 msec/day
_____________________________________________________________________________________

                             APPENDIX D
                   UARS BATTERY PERFORMANCE DATA
                    Week ending 26 October 2001


           22 October 2001 - GMT Day 295 Beta = 21.1 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    +728.0/+728.0   -3.57/-4.94    +0.0/ -0.0     11.3     0.000     0.0
2    +00.0/ -22.4    +5.15/+3.55    +28.8/-14.5    29.1     1.040     20.9
3    +22.4/ -50.4    +4.19/+2.60    +28.1/-14.3    29.0     1.030     20.5


           26 October 2001 - GMT Day 299 Beta = 36.8 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     +728.0/+728.0   -3.57/-4.94   +0.0/ -0.0     11.3     0.000      0.0
2     +00.0/-134.4    +5.46/+4.50   +27.2/-14.4    26.8     1.020      20.7
3     +22.4/ -56.0    +4.50/+3.55   +26.8/-14.8    26.4     1.020      20.5


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

_______________________________________________________________________________

                                   APPENDIX E
                          UARS ANOMALY REPORTS
                       Week ending 26 October 2001

                    NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT      TIME        TTR     PROBLEM/DATA LOSS
------     ------     -----      ----        ---     -----------------
01-061     FOT        55268     293/1135     14170   Generic Late Acquisition
01-062     FOT        55287     294/1719     24085   Incorrect Data Time-tag
01-063     FOT        55314     296/1240     N/A     TAC Crashed
01-064     FOT        55319     296/2114     N/A     Mis-configure
01-065     FOT        55335     297/2254     N/A     Unable to Command


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS      ORBIT      TIME        TTR     PROBLEM/DATA LOSS
------    ------      -----      ----        ---     -----------------
01-062    FOT         55287      294/1719    24085   Incorrect Data Time-tag
01-063    FOT         55314      296/1240    N/A     TAC Crashed
01-064    FOT         55319      296/2114    N/A     Mis-configure
01-065    FOT         55335      297/2254    N/A     Unable to Command

            
                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
------    ------      -----      ---         ---      -----------------
01-061    FOT         see list   Oct 01      14170    Generic Late Acquisition

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