UARS Weekly Status Report

11 December 1998




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                UARS WEEKLY STATUS REPORT - 11 DEC 1998

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

SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.

Announcing the newest member of the SOLSTICE Family - Maggie Boyle -
Brian and Lisa Boyle's new daughter.  Congratulations Brian!

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

Nothing received.

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

Nothing received.

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HALOE 
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Nothing received.

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

The instrument is now off as scheduled.

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

Nothing received.

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

Nothing received.

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MPG
***********

Routine processing of instrument Daily Activity Plans continues  
with no problems.  The MPG continues to assist the Project 
Scientist with the scheduling of instrument operations. 

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

The CDHF has received a total of 444 CD-ROM requests as of 11-December-1998.
Two orders were received and shipped this week.

The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
  (C) = Complete, (F)= Failed  (L) = Days remaining to reprocess.
             18 days HAL (4.80) PROD (L2-L3) (89R-80C=9L)
             47 days HAL (4.80) PROD (L3)    (1874R-1476C=398L)
             46 days SOL (4.62) PROD (L2-L3) (2313R-2198C=115L)
             25 days SUS (7.00) PROD (L1)    (43R-25C=18L)
             46 days SUS (7.00) PROD (L3)    (2540R-823C-3F=1714L)
              0 days CLA (7.00) ENG  (L1-L3) (24R-21C=3L)
 
One month of old accounting data was successfully loaded from the operational
system archive tape onto the development database.  This information 
will be analyzed to determine correlation in SOLSTICE processing time 
degradation.

Preventive Maintenance for CDHF systems and peripherals is scheduled for 
Tuesday 12/15/98.

The CDHF continued the configuration phase of the of UCSS. This effort involves 
the software installation of UOAS 5.5, UCSS 10.1, MSS 4.1, and NRT 5.4.  
                                                        
CDHF pending software upgrades: IDL 5.1, OpenIngres, UCSS 10.1, MSS 4.1,
NRT 2.5, UOAS 5.4                                        
                  
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FOT
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REPORTING PERIOD

This report covers 27 November 1998 (Orbit 39418, GMT Day 332) through 04 
December 1998 (Orbit 39522, GMT Day 338).


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       331/0006     39403     AXIS On
            HALOE      334/1254     39456     On
             PEM       334/1619     39459     Off
             PEM       335/0336     39465     AXIS Off
            WINDII     335/2239     39477     Off
             PEM       336/0021     39478     On (PMON)

A summary of Instrument operations supplied by the Mission Planning Group 
for the month of December 1998 is contained in Appendix F, UARS Instrument 
Operations Summary.

The beta angle ranged between 65.8 degrees to 37.0 degrees for this report 
period. The beta angle is now decreasing toward a minimum angle of -1.0 
degrees on 13 December 1998 (DOY 347).

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 1.0 to 1.6 degrees C.  Additional battery performance data 
for each battery on 27 November 1998 and 04 December 1998 are provided in 
Appendix D.

The clock error ranged from 10.4 to -11.1 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.

%     ALERTS        =     01
%     OUT-OF-LIMITS =     04

The following real-time command sheets were executed for the listed 
operational element(s) during this report period (see Appendix A). 

%     FOT     04
%     HALOE   03
%     PEM     04
%     WINDII  03

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

%     FOT     07

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

TRANSPONDER FREQUENCIES:
Transponder A:  98/286  -  2287.496917
Transponder B:  98/300  -  2287.498980


GROUND SYSTEM OPERATION

Five (5) 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 98/337 show the observatory data loss to be 
21 hours, 40 minutes, 6.772 seconds (an increase of 26.752 seconds since 
last report period).  This is a 0.0343 percent data loss which equals a 
99.9657 percent data capture for the mission.

The increase of 26.752 seconds occurred over five (5) days:

7 5.216 seconds on Day 331 due to hits in data (IP);
7 9.888 seconds on Day 332 due to hits in data (IP);
7 7.904 seconds on Day 333 due to hits in data (IP);
7 3.520 seconds on Day 334 due to hits in data (IP); and
7 0.224 seconds on Day 336 due to data hit.


OTHER SIGNIFICANT EVENTS

UARS SATELLITE OPERATIONS

Preparation of 0.5 degrees (colds side down) roll procedure to be executed 
in December 1998 and January 1999 continues.

The procedure for the clock change to include the 01 January 1999 leap 
second adjustment continues.

Flight Operations and SOLSTICE have been developing the methodology for 
SOLSTICE Day-Only Operation.

Investigating the feasibility of a new PMON action to change battery V/T 
curves based on loading to mitigate battery risks in sun pointing safehold.


YEAR 2000 OPERABILITY SUPPORT

UARS Test and Training Simulator (UTTS) - No change.

User Planning System (UPS) - No change.

Multi Satellite Operations Control Center (MSOCC) - No change.

Command Management System (CMS) - No change.

Flight Dynamics Facility (FDF) - see CMS paragraph.


IP NETWORK TESTING - Complete


UARS PROPULSION MODULE B/D THRUSTER LINE FILL

Planning continues for the simulator testing.


UARS RE-ENGINEERING - TELEMETRY PROCESSING

Testing of the Trending System v.1.1 release (CM-0009) continued.


MEETINGS

None


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver is scheduled for scheduled for 13 
December 1998.

The United States Naval Observatory (USNO) issued  a Time Service 
announcement advising that the International Earth Rotation Service (IERS) 
will retard UTC time by 1.0 second at the end of December 1998. This means 
the addition of one leap second as the last second of 1998.

The next annular solar eclipse will occur on 16 February 1999 over the 
Indian Ocean, Australia and the South Pacific Ocean.


PERSONNEL CHANGES

none


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 F,  UARS Instrument Operations Summary




                               APPENDIX A
                       REAL-TIME COMMAND SHEETS
                      Week ending 04 December 1998

ORBIT        AOS          NO.    SUBSYS      REASON
-----        ---         ---    ------       -------  
39403     331/0006     98-473      PEM      Power AXIS ON 
39408     331/0825     98-474      WINDII   Error clear
39416     331/2032     98-475      OBC      Clk Adj fr 40.2 to 20.6 msec/day
39435     333/0331     98-476      OBC      Clk Adj fr 20.6 to 0.00 msec/day
39452     334/0654     98-477      OBC      Clk Adj fr 0.00 to 20.6 msec/day
39456     334/1254     98-478      HALOE    Power ON
39459     334/1619     98-479      PEM      Power OFF
39465     335/0336     98-480      PEM      AXIS Pwr OFF
39469     335/1034     98-481      WINDII   Error clear
39477     335/2239     98-482      WINDII   Power OFF
39478     336/0021     98-483      PEM      PMON GROUP 10 ENA
39490     336/1913     98-484      HALOE    MUB DISA (HIGH BARREL TEMP.)
39490     336/1948     98-484      HALOE    MUB ENA (BARl. TEMP BACK IN LIM.)
39492     336/2243     98-485      OBC      Clk Adj fr 20.6 to 0.00 msec/day

_______________________________________________________________

                               APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 04 December 1998

MNEMONIC        STATE       DESCRIPTION                     ORBITS
---------       -----      ------------                    ------
HRPTSBARTMP     Y-LO     HRDI BARREL TEMP            39414-39417
HACS4           Y-HI     Control status word 4       39490
HRPTSBARTMP     R-LO     HRDI BARREL TEMP            39490
HACS4           R-HI     Control status word 4       39490


The following ALERT occurrences were detected:

MNEMONIC              DESCRIPTION                           ORBITS
---------             ------------                          ------
WIERRLIMIT     WINDII Software Error Code = E03     39408     



_______________________________________________________________

                               APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                      Week ending 04 December 1998


                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT              TIME                 CLOCK RATE CHANGE
     -----              ----                 -----------------
     39435     333/03:36 (29 Nov 98)     from 20.6 to 0.00 msec/day
     39452     334/07:06 (30 Nov 98)     from 0.00 to 20.6 msec/day
     39492     336/22:55 (02 Dec 98)     from 20.6 to 0.00 msec/day


_______________________________________________________________

                               APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                      Week ending 04 December 1998


     27 Nov 1998 - GMT Day 331 Beta = 65.8 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   +95.2/+67.2  -3.05/-4.62   +0.0/ +0.0    16.8    0.000     0.0
2   +11.2/-33.6  +3.87/+2.60  +22.8/-15.2    26.7    1.030    17.3
3   +44.8/ 0.0   +2.92/+1.66  +22.0/-14.4    26.7    1.031    16.7


     04 Dec 1998 - GMT Day 338 Beta = 37.0 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   +84.0/+56.0  -3.05/-4.62   +0.0/ +0.0    16.8    0.000    0.0
2   +28.0/-22.4  +5.47/+4.51  +29.6/-15.2    25.8    1.027   21.0
3   +56.0/-5.6   +4.51/+2.92  +28.8/-15.2    25.8    1.026   20.7


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



                               APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 04 December 1998


                      NEW ANOMALY REPORTS GENERATED
  AR NO.   SUBSYS   ORBIT     TIME       TTR         PROBLEM/DATA LOSS
  ------   ------   -----     ----       ---          -----------------
98-092     FOT     39407     331/0642    14170     Generic Late Acquisition
98-092     FOT     39415     331/1858    14170     Generic Late Acquisition
98-092     FOT     39420     332/0327    14170     Generic Late Acquisition
98-115     FOT     39433     333/0009    N/A       TAC 4 Crashed
98-116     FOT     39468     335/0852    20415     IP Problem at White Sands
98-116     FOT     39469     335/0937    20415     IP Problem at White Sands
98-119     FOT     39492     336/2243    N/A       TAC Crashed


                ANOMALY CLOSURE INFORMATION RECEIVED
  AR NO.   SUBSYS  ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------  -----      ----       ---      -----------------
98-092     FOT     NOV 98               14170     GENERIC LATE ACQ
98-107     FOT     39308     324/16:40            TAC 2 PROB     
98-108     FOT     39309     324/17:23            TAC PROBLEMS
98-109     FOT     39323     325/15:46            TAC PROBLEMS
98-110     FOT     39325     325/19:16            TAC PROBLEMS
98-111     FOT     39341     326/20:52   20396    DESKTOP DOWN
98-112     FOT     39342     326/22:04   20396    DESKTOP DOWN
98-113     FOT     39342     326/22:43            CMD PROBLEMS
98-114     FOT     39355     327/17:35            TAC/DMP PROBLEMS
98-115     FOT     38433     333/00:09            TAC 4 CRASH
98-116     FOT     39648     335/08:52   20415    IP DOWN
98-118     FOT     39490     336/19:18            BANK DMP TIME OUT
98-119     FOT     39490     336/19:48            BANK DMP TIME OUT


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


                       OPEN ANOMALY REPORTS
  AR NO.   SUBSYS    ORBIT    TIME       TTR       PROBLEM/DATA LOSS
  ------   ------    -----    ----       ---      -----------------
98-117     FOT     DEC 98     See List  14170    GENERIC LATE ACQ




_______________________________________________________________
                               APPENDIX F
                   UARS INSTRUMENT OPERATIONS SUMMARY
                      Week ending 04 December 1998


              INSTRUMENT SUMMARY FOR MONTH OF December 1998 (hours)


                                     UNPLANNED   UNSCHEDULED
              ON    Day-    OFF         OFF         OFF     
                    Only           (Insufficient  (Other
Instrument (Actual) Ops (Scheduled)   Power)      Problem)       COMMENTS  
----------  ------  --- ----------- -----------  -----------  -------------

ACRIM        720                       0             0

HALOE        224           496         0             0

HRDI         247    473    0           0             0

MLS          218           502         0             0

PEM (axis)   88            632         0             0

PEM (zeps)   178    534    8           0             0

PEM (heps)   0             0           0             720     See Note 1

SOLSTICE     720           0           0             0

SUSIM        720           0           0             0

WINDII       360           269        91             0


Note 1.     PEM High Energetic Particle System (HEPS) was scheduled to be 
ON for day-light only operation.  However, HEPS remained OFF due to a 
problem encountered with automatic turn-on procedure for instrument high 
voltage power.

Cold side of spacecraft was facing northward:   28.5 days
Cold side of spacecraft was facing southward:   1.5 days

	 	SEVNTFW49