UARS Weekly Status Report

06 November 1998





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                UARS WEEKLY STATUS REPORT - 06 NOV 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.


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

SUSIM successfully gathered its normal solar, offset, and occulation
data during this past week without apparent problems.

Reprocessing of all SUSIM experiment days to version 20 continues.


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

Nothing received.

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

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 433 CD-ROM requests as of 06-November-1998.
Three orders were received and shipped.
    
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.           
             14 days HAL (4.80) PROD (L1)    (1873R-1865C-4F=4L)
              0 days HAL (4.80) PROD (L3)    (1873R-1139C=734L)
             49 days SOL (4.62) PROD (L2-L3) (2349R-1963C=386L)
             72 days SUS (7.00) PROD (L1-L3) (1249R-72C=1177L)
              1 days CLA (7.00) ENG  (L1-L3) (18R-4C-2F=12L)   

The CDHF installed Y2K compliant CMS v3.9 (DEC/Code Management System)
on CDHF5. Users were able to connect to the existing library and
successfully execute CMS macro commands.
             
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
***********

REPORTING PERIOD

This report covers 23 October 1998 (Orbit 38894, GMT Day 297) through 30 
October 1998 (Orbit 38998, GMT Day 303).


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        303/2237       38998     Off

The beta angle ranged between 38.1 degrees to 13.9 degrees for this report 
period. The beta angle is now increasing toward a minimum angle of 3.0 
degrees on 02 November 1998 (DOY 306).

Flight Operations continues to work with the PEM instrument to fine tune 
the operational command sequences associated with the OBC Power Monitor 
day-only operational capability.

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 1.3 degrees C.  Additional battery performance data 
for each battery on 23 October 1998 and 30 October 1998 are provided in 
Appendix D.


The clock error ranged from 10.3 to -11.4 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 =     02

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

%     FOT       03
%     PEM       07
%     HALOE     01
%     HRDI      01
%     SOLSTICE  01

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

%     FOT       06

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

TRANSPONDER FREQUENCIES:
     Transponder A:  98/210  -  2287.496941
     Transponder B:  98/211  -  2287.499161


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 98/302 show the observatory data loss to be 
21 hours, 11 minutes, 06.740 seconds (an increase of 31.68 seconds since 
last report period).  This is a 0.0340 percent data loss which equals a 
99.9660 percent data capture for the mission.

The increase of 31.68 seconds occurred over seven (7) days:

7 3.136 seconds on Day 296 due to hits in data and insufficient overlap;
7 2.368 seconds on Day 297 due to hits in data and line errors (IP);
7 0.632 seconds on Day 298 due to hits in data and IP hits;
7 14.368 seconds on Day 299 due to line errors (IP) hits in data and 
insufficient overlap;
7 3.200 seconds on Day 300 due to line errors (IP) and data hits;
7 6.240 seconds on Day 301 due to hits in data; and
7 0.736 seconds on Day 302 due to hits in data (IP).

The FOT modified the CMS resident Relative Time Sequence 06 (RTS 06) to 
facilitate proper PMON-controlled day-only operation of the PEM instrument.

A request from SUSIM Operations to perform another series of SSPP Gridded 
Offset maneuvers on GMT days 311 through 316 was received this week.  The 
offsets will utilize the 5 and 10 arcminute step intervals, as opposed to 
the 15 and 30 arcminute intervals


OTHER SIGNIFICANT EVENTS

UARS SATELLITE OPERATIONS

FOT continues to improve a power profile for UARS based on the current 
status of the Modular Power System.

Investigation continues into possible impacts of the Leonid meteorite 
shower in November 1998.

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) - The FOT received a valid Y2K Star Catalog 
from FDF this week.  Apparently, the star catalog files that FDF was 
sending to the FOT previously were being incorrectly re-formatted by the 
FORMATS system.  Eventually, FDF did the necessary file re-formatting in 
house and bypassed FORMATS altogether by sending the re-formatted star 
catalog file directly to the CMS.  Once the file was received on CMS, it 
was ran through the CMS poller, which performed all of the necessary 
conversions to the CMS readable Raw Data Base RDB file.

Still waiting for a 8-week S/C Orbital Events file from FDF which contains 
a SC_YAWMAN event.  Once the FOT receives this file, the last remaining Y2K 
test function (#12) of the 1999-to-2000 test case (#1) can be completed.  
In addition, the FOT is also awaiting a valid set of 3-day PSAT and S/C 
Orbital Events files from FDF which span the 2000-to-2001 century 
crossover.  Up to this point, all of the PSAT and S/C Orbital Events files 
generated for that time frame appear to have an Rascending nodeS 
inconsistency between the two files, making it impossible to process them 
on CMS.

Flight Dynamics Facility (FDF) - see CMS paragraph.

IP NETWORK TESTING

Space Network (SN) - Operational.

NCC 98 system - In planning.

Deep Space Network (DSN) and Ground Spaceflight Tracking and Data Network 
(GSTDN) - No change.  Coordinating test with NIA personnel.

UARS PROPULSION MODULE B/D THRUSTER LINE FILL

GSFC Propulsion Branch reported that the propulsion engineers will be ready 
to support the UARS simulated line refill test after 04 November 1998. FOT 
is developing the command techniques to achieve a 16 ms and an 8 ms command 
timing of the latch valve between on and off.  This will be checked with 
the simulator before using the latch valve test hardware.  Jackson and Tull 
were funded to built the test hardware but do not have funds to support 
operation initial checkout or operation of the test.


UARS RE-ENGINEERING - TELEMETRY PROCESSING

Flight operations is providing assistance on both sustaining engineering 
and re-engineering activities to incorporate needed features into the 
Trending system.  A meeting was held on 30 October 1998 with the sustaining 
engineering team regarding DR and ER items.  Supporting details regarding 
current trending products and desired functionality of the new trending 
system were provided.


MEETINGS

A meeting was held 29 October 1998 with Mike Bay (Jackson and Tall), 
Dimitrios Mantziaras, and Dan Wise to discuss the best way to command the 
Latch valves for the UARS line fill test.  Information was received on the 
RIU modes which will be helpful to the test. An agreement as to the 
technique (PDB and ATC commands) was reached.

The November battery telecon is scheduled for 24 November 1998. The 29  
October 1998 telecon was not attended by the UARS FOT due to conflicts.


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver is scheduled for scheduled for 02 
November 1998.

UARS will pass through the Leonid meteor shower on 17 November 1998 at 
19:43 UTC (+/- 3 hours).

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 A
                       REAL-TIME COMMAND SHEETS
                      Week ending 30 October 1998

ORBIT        AOS        NO.     SUBSYS       REASON
-----        ---        ---     ------       -------  
38903     297/1518     98-408   PEM     PEM Turn-on test
38918     298/1522     98-409   OBC     Clk Adj fr 0.00 to 20.6 msec/day
38937     299/2040     98-410   PEM     PEM Turn-On test
38937     299/2141     98-411   PEM     PEM Turn-On test
38942     300/0607     98-412   OBC     Clk Adj fr 20.6 to 0.00 msec/day
38951     300/2030     98-413   OBC     PEM/HEPS test
38952     300/2145     98-414   SOLS    Reset Observation List
38967     301/2046     98-415   PEM     PEM/HEPS
38982     302/2052     98-416   PEM     PEM/HEPS Test
38994     303/1734     98-417   PEM     RTS-6 Activate
38997     303/2157     98-418   PEM     PEM/HEPS Test
38997     303/2157     98-419   HRDI    HRDI Microload
38998     303/2337     98-420   HAL0    Power OFF

_______________________________________________________________

                               APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 30 October 1998

MNEMONIC        STATE        DESCRIPTION                    ORBITS
---------       -----        ------------                   ------
NBRECBI         Y-HI     NBTR B Total Current              38900
HRPTSPBIMON     Y-HI     PTS Pulse Bus Current Monitor     38950


The following ALERT occurrences were detected:

MNEMONIC                     DESCRIPTION                    ORBITS
---------                    ------------                   ------
                           None this report period


_______________________________________________________________

                               APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                      Week ending 30 October 1998


                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT              TIME                 CLOCK RATE CHANGE
     -----              ----                 -----------------
     38918     298/15:26 (25 Oct 98)     from 00.0 to 20.6 msec/day
     38942     300/06:10 (27 Oct 98)     from 20.6 to 00.0 msec/day


_______________________________________________________________

                               APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                      Week ending 30 October 1998


     23 Oct 1998 - GMT Day 296 Beta = 38.1 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 -3.05/-3.99   +0.0/ +0.0   17.9     0.000    0.0
2   +44.8/-5.6   +5.47/+4.51  +29.2/-14.4   26.1     1.028   20.6
3   +134.4/0.0   +4.51/+3.23  +28.4/-14.4   26.1     1.026   20.2


     30 Oct 1998 - GMT Day 303 Beta = 13.9 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  +470.0/+190.4 -3.05/-3.99   +0.0/ +0.0     17.1   0.000    0.0
2   +44.8/ 0.0   +7.09/+5.47  +31.6/-14.4     24.2   1.022   22.8
3  +128.8/+11.2  +5.79/+4.51  +30.8/-16.0     24.2   1.020   22.6


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



                               APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 30 October 1998


                     NEW ANOMALY REPORTS GENERATED
  AR NO.   SUBSYS  ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------  -----      ----       ---      -----------------
98-083     FOT     38937     299/2040           Playback Errors
98-084     FOT     38953     300/2327           TAC 8 Crashed
98-085     FOT     38971     302/0431           Multiple TAC crashes
98-086     FOT     38978     302/1457           TAC 2 Crashed
98-087     FOT     38994     303/1637           TAC #2 Crashed
98-066     FOT     38998     303/2337   14170   Generic Late Acquisition

                ANOMALY CLOSURE INFORMATION RECEIVED
  AR NO.   SUBSYS  ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------  -----      ----       ---      -----------------
98-082     FOT     38888     296/15:14  20288   IP TELEMETRY HITS
98-083     FOT     38937     299/20:40          NBR P/B ERRORS
98-084     FOT     38953     300/23:27          TAC 8 CRASH
98-085     FOT     38971     302/04:31          TAC 8 CRASHES
98-086     FOT     38978     302/14:57          TAC 2 CRASH

               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
  ------   ------   -----     ----       ---      -----------------
98-066     FOT     Oct 98     See List  14170     GENERIC LATE ACQ
98-087     FOT`     38994     303/16:37           TAC 2 CRASH

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