UARS Weekly Status Report

13 AUGUST 1999




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                UARS WEEKLY STATUS REPORT - 13 AUG 1999

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

Other than being briefly turned off for the solar eclipse on August 11, 
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
***********

Nothing received.

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

Nothing received.

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

     The PEM spectrometers continue to be active under PMON control.  While 
under PMON control, the PEM instrument computed energy deposition from its 
particle spectrometers.

     The FOT and the PEM team are completing close-out documentation on 
the HEPS Energy Processor trouble; however progress has been hampered 
with the departure of Peter Thomas.

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

Nothing received.

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

The instrument is now off as scheduled.

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

HRDI is operating normally.

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

WINDII was activated yesterday (August 12) and is operating
normally. Data will be acquired until August 15. 

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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. 

***********
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.
        15 days CLA (7.0)  PROD (L1-L3)         (473R-173C-12F=288L)
        45 days GPI (4.05) PROD (CLAES L3B)     (95R-90C=5L)
         0 days WIN (5.11) PROD (L1-L3)         (1540R-1028C-33F=479L)
         5 days WIN (5.11A) ENG (L1-L3)         (7R-5C=2L)
         7 days WIN (5.11A) ENG (LOG)           (7R-7C=0L)

The CDHF continued integrating the "UARS" environment on CDHFA/B.  

DAAC data created in the month of June 1999 has been previewed for
HALOE, PEM, NMC, and UKMO.

CDHF pending software upgrades:  DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres.                 
                  
***********
FOT
***********

REPORTING PERIOD

This report covers 31 July 1999 (Orbit 43087, GMT Day 212) through 6 August 
1999 (Orbit 43191, GMT Day 218).


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          218/1634     43187     On
            HALOE          218/1732     43188     Off
            HALOE          218/2130     43190     On

The beta angle ranged between the angles of 60.2 degrees to 75.1 degrees for 
this report period.  The maximum beta angle observed for this peak was 75.1 
degrees on 31 July 1999 (DOY 212).

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 0.94 to 1.27 degrees C.  Additional battery performance data for each 
battery on 30 July 1999 and 06 August 1999 are provided in Appendix D.

The clock error ranged from -13.0 to 10.9 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.

%     ALERTS         =   00
%     OUT-OF-LIMITS  =   06

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

%     FOT     =   04
%     HRDI    =   03
%     HALOE   =   03
%     SUSIM   =   01

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

%     FOT     =   04

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

TRANSPONDER FREQUENCIES:
%     Transponder A:   99/208:   2287.496910
%     Transponder B:   99/209:   2287.498901

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 99/217 show the observatory data loss to be 24 hours, 54 
minutes, 46.004 seconds (an increase of 6.272 seconds since the last report 
period).  This is a 0.0361 percent data loss which equals a 99.9639 percent 
data capture for the mission.

The increase of 6.272 seconds occurred over four (4) days:

7 0.224 seconds on DOY 211 due to data hit.
7 1.312 seconds on DOY 212 due to IP line hit.
7 4.224 seconds on DOY 214 due to IP line hit.
7 0.512 seconds on DOY 216 due to data hit.


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 FOT received a set of Y2K planning aids from FDF which will be used to 
facilitate UARS Y2K end-to-end testing.  Eleven 3-day planning aid files were 
received and processed by the FOT.  Two of these files did not process 
successful on the CMS due to either incorrect data, or invalid data formats.  
FDF has been notified of the problems, and are in the process of correcting the 
files.  (Have not received a status as of yet).




MEETINGS

August 3, 1999 (DOY 215):  Y2k meeting to discuss the upcoming end-to-end 
testing as well as the MILA test.  The backup CMS has to be updated with the 
current operations software before any of the testing can be completed, Mike 
Hannah has been tasked with action.

August 4, 1999 (DOY 216):  Monthly UARS meeting.  Combined meeting to present 
the annual history of UARS and upcoming events.  FOT was assigned five action 
items.

1) Understand the manetometer/FSS safehold recovery procedure including 
recovery procedures from safehold.
2) Understand limitations and operations of crippled solar array drive.
3) Performance trending of NBTR-B
4) Generate annular Leonid meteor shower plan.
5) Investigate UARS end of life disposal plan.


August 5, 1999 (DOY 217):  UARS Control Center Meeting was held to discuss the 
DOC hardware.  FOT was assigned two Action items:

1) Write a report on the impact of the removal of the RUPS, due August 19th.
2) Figure out how many of the machines in the DOC (APUs, TACUs, etc..._ are 
really needed to fly our spacecraft.

Post meeting, Dimitrios gave Charlie Coleman the requirements for what will be 
needed to complete the upcoming simulator testing.

August 6, 1999 (DOY 218):  FOT met to discuss final preparations for partial 
solar eclipse.


FUTURE SIGNIFICANT EVENTS

August 20, 1999 (DOY 232): The next UARS Yaw Around Maneuver (forward-to 
reverse) is scheduled.

Aug 11, 1999 (DOY 223): Preparations for a partial eclipse of the Sun is 
planned.  All instruments (except SUSIM) will be commanded off two orbits prior 
to the eclipse (0900 Zulu) and then power on two orbits following the event 
(1700 Zulu).  Final details are available.


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 6 August 1999

ORBIT       AOS          NO.      SUBSYS     REASON
-----       ---         ---       ------     -------  
43115     213/2128     99-266     HRDI     Telescope Safehold - hi temp
43129     214/1938     99-267     SUSIM    Turned Detector off
43135     215/0533     99-268     OBC      Clk Adj fr 41.2 to 20.6 msec/day
43140     215/1215     99-269     HRDI     HRDI Telescope Safe - Hi Bar Temp
43141     215/1358     99-270     HRDI     HRDI Reconfigure for Fulltime
43163     217/0202     99-271     OBC      Clk Adj fr 20.6 to 41.2 msec/day
43180     218/0525     99-272     OBC      Clk Adj 41.2 to 20.6 msec/day
43184     218/1044     99-273     OBC      Clk Adj 20.6 to 0.00 msec/day
43187     218/1634     99-274     HALOE    Power ON
43188     218/1732     99-275     HALOE    Power OFF
43190     218/2130     99-276     HALOE    Power ON               
_______________________________________________________________

                            APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 6 August 1999

MNEMONIC       STATE     DESCRIPTION          ORBITS
---------      -----     ------------         ------
HRPTSBARTMP     Y-LO     HRDI BARREL TEMP     43108-13
HRPTSBARTMP     R-LO     HRDI BARREL TEMP     43114-15
HRPTSBARTMP     Y-LO     HRDI BARREL TEMP     43135-39,42
HRPTSBARTMP     R-LO     HRDI BARREL TEMP     43140-41
HRIFESURVTMP    Y-HI     HRDI SURVIVAL TEMP   43149-51
HRRADTEMP       Y-HI     HRDI RADIATOR TEMP   43151


The following ALERT occurrences were detected:

MNEMONIC          DESCRIPTION                ORBITS
---------        ------------                ------
No Alerts to report this report period.

_______________________________________________________________

                         APPENDIX C
            CLOCK & SOLAR ARRAY RATE CORRECTIONS
                  Week ending 6 August 1999
                 CLOCK DRIFT RATE ADJUSTMENTS

ORBIT        TIME                       CLOCK RATE CHANGE
-----        ----                        -----------------
43091     212/06:03 (31 July 99)      from 20.6 to 41.2 msec/day
43135     215/05:33 (3 August 99)     from 41.2 to 20.6 msec/day
43163     217/02:08 (3 August 99)     from 20.6 to 41.2 msec/day
43180     218/05:25 (3 August 99)     from 41.2 to 20.6 msec/day
43184     218/10:44 (3 August 99)     from 20.6 to 0.0 msec/day



                            APPENDIX D
                  UARS BATTERY PERFORMANCE DATA
                    Week ending 6 August 1999

     30 July 1999 - GMT Day 211 Beta = 74.1 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  -112.0/-134.4    -2.42/-3.68  +0.0/+0.0      16.5       0.000     0.0
2   +22.4/-5.6      +2.60/+1.66 +16.4/-13.6     27.5       1.036    13.4
3   +22.4/-22.4     +1.97/+1.03 +16.0/-13.6     27.5       1.035    13.1


     6 August 1999 - GMT Day 218 Beta = 60.2 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   -112.0/-134.4   -3.05/-4.31  +0.0/+0.0      16.5       0.000     0.0
2    +22.4/-11.2    +4.51/+2.60 +23.2/-15.2     26.4       1.025    17.2
3    +33.6/-16.8    +3.23/+1.66 +23.2/-14.4     26.2       1.020    16.7


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



                        APPENDIX E
                    UARS ANOMALY REPORTS
                 Week ending 6 August 1999


                NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT     TIME          TTR     PROBLEM/DATA LOSS
------     ------     -----     ----          ---     -----------------
99-033     FOT        43139     215/1026     14170    Generic Late Acquisition
99-039     FOT        43175     217/2052     14170    Generic Late Acquisition
99-040     FOT        43187     218/1634     21201    NASCOM problem at WSGT
99-039     FOT        43189     218/1949     14170    Generic Late Acquisition


           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
------     ------     -----     ----          ---     -----------------
99-033     FOT     see list     July 99     14170     Generic Late Acq.
99-040     FOT       43187     218/1634     21201     NASCOM problem at WSGT

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