UARS Weekly Status Report

04 JUNE 1999




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                UARS WEEKLY STATUS REPORT - 04 JUNE 1999

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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.

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

SUSIM gathered its normal solar, offset, and occultation data without
apparent problems.

We are evaluating the recently reprocessed V20 products before their
release to the DAAC.

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

Nothing received.

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HALOE 
***********

Nothing received.

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

MLS was reactivated successfully on May 11 and operated until May 19 13:27 UTC
when the FOT needed to turn MLS off due to power constraints. MLS was reactived
on May 24 and operated through May 28. 

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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 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.
        11 days CLA (7.0)  PROD (L1-L3)         (53R-36C-4F=13L)
        48 days WIN (5.11) PROD (L1-L3)         (1540R-632-4F=904L).
                    
REHOST- Multinet is installed on the cluster allowing telnet and tcp/ip 
capabilities. Optimizing Filetek primary files indices to improve performance
for Filetek data migration. Defined required logicals affecting Ingres 
functions.

The CDHF will load April 1999 current day DAAC data in June 1999.

CDHF pending software upgrades:  DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres
                  
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FOT
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REPORTING PERIOD

This report covers 22 May 1999 (Orbit 42039, GMT Day 142) through 28 May 
1999 (Orbit 42143, GMT Day 148).


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        143/1525     42063     Day Only
               MLS        144/1707     42079     On
               MLS        148/2344     42143     Off

The beta angle ranged between the angles of 77.1 degrees to 56.5 degrees 
for this report period.  The beta angle is now decreasing toward a minimum 
angle of 0 degrees on 11 June 1999 (DOY 162).

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 0.7 to 1.3 degrees C.  Additional battery performance data 
for each battery on May 21 1999 and May 28 1999 are provided in Appendix D.

The clock error ranged from 12.8 to -10.8 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         =     00
%     OUT-OF-LIMITS  =     00

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

%     FOT     04
%     MLS     04
%     PEM     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).

TRANSPONDER FREQUENCIES:
          Transponder A:  99/117  -  2287.496987
          Transponder B:  99/118  -  2287.498739


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 99/119 show the observatory data loss to be 
24 hours, 13 minutes, 02.420 seconds (an increase of 12.096 seconds since 
the last report period).  This is a 0.0360 percent data loss which equals a 
99.9640 percent data capture for the mission.


The increase of 12.096 seconds occurred over four (4) days:

7 0.416 seconds on Day 141 due to a data hit,
7 2.080 seconds on Day 142 due to no overlap,
7 0.448 seconds on Day 145 due to data hit,
7 9.152 seconds on Day 146 due to no overlap.


OTHER SIGNIFICANT EVENTS

UARS SATELLITE OPERATIONS

FOT personnel are supporting the IMOC (SCS-21) development effort.  The 
current work is a continuation of the SCS-21 UARS implementation effort 
done last year which culminated in a level 1 demonstration.

The FOT continues to investigate 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

The end-to-end testing has been delayed until a new FORMATS software 
release can be made to accommodate the special Y2K planning aids.

UARS PROPULSION MODULE B/D THRUSTER LINE FILL - No change


MEETINGS

FOT attended the weekly IMOC meetings on 26 May 1999.


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver (forward-to-reverse) is scheduled for 11 
June 1999 (DOY 162).


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 A
                       REAL-TIME COMMAND SHEETS
                        Week ending 28 May 1999

ORBIT        AOS         NO.     SUBSYS     REASON
-----        ---        ---     ------     -------  
42060     143/1014     99-183     OBC     Clk Adj 20.6 to 41.2 msec/day
42063     143/1525     99-184     PEM     Power ON, Day Only Ops
42079     144/1707     99-162     MLS     Power ON          
42100     146/0249     99-185     OBC     Clk Adj 41.2 to 20.6 msec/day
42109     146/1646     99-186     MLS     Scan Rate Adj.
42121     147/1131     99-187     OBC     Clk Adj 20.6 to 0.00 msec/day
42139     148/1727     99-188     MLS     MLS RESET
42142     148/2202     99-189     OBC     Clk Adj 0.00 to 20.6 msec/day
42143     148/2344     99-190     MLS     Power OFF

_______________________________________________________________

                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                        Week ending 28 May 1999

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 May 1999

                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT            TIME                    CLOCK RATE CHANGE
     -----            ----                    -----------------
     42060     143/10:18 (23 May 99)     from 20.6 to 41.2 msec/day
     42100     146/02:56 (25 May 99)     from 41.2 to 20.6 msec/day
     42121     147/11:38 (27 May 99)     from 20.6 to 00.0 msec/day
     42142     148/22:05 (28 May 99)     from 00.0 to 20.6 msec/day


                              APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                        Week ending 28 May 1999


     21 May 1999 - GMT Day 141 Beta = 77.1 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   -89.6/-106.4  -2.11/-3.05  +0.0/ +0.0    16.5    0.000    0.0
2   +11.2/-11.2   +2.92/+1.34 +15.2/-16.0    25.1    1.077   12.8
3   +22.4/-44.8   +2.29/+0.71 +15.2/-16.0    25.1    1.081   12.6


     28 May 1999 - GMT Day 148 Beta = 56.5 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   -89.6/-112.0  -3.68/-4.94  +0.0/ +0.0    16.5    0.000    0.0
2   +22.4/-11.2   +5.15/+3.87 +25.6/-16.0    24.8    1.022   21.0
3   +33.6/-22.4   +4.51/+2.60 +24.8/-16.0    24.8    1.026   20.6


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



                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 28 May 1999


                     NEW ANOMALY REPORTS GENERATED
  AR NO.   SUBSYS    ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------    -----      ----       ---      -----------------
99-027     FOT      42100    146/0249     20905     I channel dropout/no


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


                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
  ------   ------    -----      ----       ---      -----------------
99-023     FOT     see list     May 99     14170    Generic Late Acq
99-027     FOT     42100       146/0249    20905    I channel dropout/no

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