UARS Weekly Status Report

24 March 2000




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                UARS WEEKLY STATUS REPORT - 24 MAR 2000

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

We continue to gather enough data to meet all the SOLSTICE science
objectives during this period of reduced tape recorder operations. 
SOLSTICE operates normally, collecting solar data on all available 
orbital tracking periods and stellar calibration observations whenever 
possible. Level 2 processing is halted due to bugs in the OA_SSPP_ATT 
service. CDHF and CSC personnel are working on the problem.

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SUSIM
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Nothing received.

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ACRIM
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Nothing received.

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PEM
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Nothing received.

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HALOE 
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Nothing received.

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MLS
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Nothing received.

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HRDI
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Nothing received.

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WINDII
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Nothing received.

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MPG
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The MPG worked with the Flight Operations Team to 
develop daily tape recorder operation schedules 
so that the maximum amount of northern hemisphere 
data will be acquired by MLS data during the operation
of MLS from March 26 through March 30, 2000.

Routine processing of instrument Daily Activity Plans 
continues with no problems.  

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CDHF
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STATUS:                          
   - 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.
         5 days HAL (4.82)  PROD MODE (L1-L3)    (23R-23C=0L)

   - The CDHF completed processing the SOLVE Mission days (3083 - 3105)
     requested by HALOE.  
   - Waiting further instructions concerning WINDII V5.11A Software.
     All requested days are complete.

 UARS CDHF REHOST:
   -  Successful processing on Rehost System:
      Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, SUSIM,
      and Solstice-(HOORAY).
   -  SOLSTICE V4.62 (JOB 1 and JOB 2) was successful on the Rehost System.
      Files and Sizes were compared to files that were created on the old
      system.  SOLSTICE has validated the output product. We are most
      appreciative of their timely response.                         
   -  Testing HRDI V4.4 and WINDII V5.11A on the Rehost System.
   -  A full day level zero transmission was received from the LZP test
      system.  These files will be compared to the production 
      files received for this same time period.   
         
DAAC DATA:
   -  Data created in the month of January 2000 has been loaded into the DAAC
      Transfer Tables for HALOE, NMC, PEM, and UKMO.
                  
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FOT
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                                  REPORTING PERIOD

This report covers 11 March, 2000 (Orbit 46443, GMT Day 071) through 17 March 
2000 (Orbit 46548, GMT Day 077).


                               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          073/0107     46474     AXIS Off
              WINDII        076/0914    46524     On

The beta angle ranged between the angles of 47.9 degrees to 11.3 degrees for 
this report period.  The beta angle is now decreasing toward a minimum angle of 
+2.0 degrees on 21 March 2000 (DOY 081).

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 1.3 degrees C.  Additional battery performance data for each 
battery on 07 March 2000 and 17 March 2000 are provided in Appendix D.

The clock error ranged from 11.1 to -12.0 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  =  08
%     ALERTS         =  00

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

%     FOT           =  20
%     AXIS          =  01
%     WINDII        =  01

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

%     FOT           =  03

Three (3) Anomaly Reports remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
- Transponder A:  00/021  -  2287.496849
- Transponder B:  00/060  -  2287.499207


                                GROUND SYSTEM OPERATION

Three (3) operational support problem 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 00/076 show the observatory data loss to be 566 hours, 21 
minutes, 30.937 seconds (an increase of 36 minutes 58.336 seconds since the 
last report period).

The increase of 36 minutes 58.336 seconds occurred over three (3) days:

- 13 minutes 34.736 seconds on Day 074.     Reason unknown.
- 12 minutes 54.472 seconds on Day 075.     Reason unknown.
- 10 minutes 29.128 seconds on Day 076.     Reason unknown.

These calculations are under repair.  They are being recalculated from the date 
where PASS 2 operations were scheduled exclusively.

                            OTHER SIGNIFICANT EVENTS

                            UARS SATELLITE OPERATIONS

The FOT completed the coding for the three TMONs identified for OBC safehold 
Failure, Detection, and Correction.  Since this was the first time for this FOT 
to use the TMON utility programs, some problems occurred during compiling.  
Some of the telemetry mnemonics identified in the TMON algorithms could not be 
found by the software.  Dick Quinn of Lockheed Martin came by and identified 
the problem areas which enabled the FOT to finish the coding.  Dick is a lead 
systems engineer on TERRA and was the lead systems engineer for UARS and 
Landsat 4/5.

Dick's time was limited so the FOT was only able to briefly discuss the 
safehold status on UARS with him.  He provided some ideas for OBC halt that are 
being combined with some of our own. Depending on some additional analysis and 
simulator testing, the FOT hopes to deliver a complete safehold package, in the 
near future.

The remaining work is as follows:

- Code RTS for use in the UARS Simulator.
- Meet with simulator support and update test scenarios.
- Test TMONs and RTSs for coding errors and system response.
- Develop OBC halt safehold protection plan.
- Submit for Peer Review.



                              FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for March 21, 2000 (DOY 081).  This 
maneuver will be a Forward to Reverse Flight maneuver (Northern 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 17 March 2000

   ORBIT     AOS        NO.       SUBSYS     REASON
   -----     ---        ---       ------     -------
   46447   071/0606     00-100    NBTR       NBTR Management
   46454   071/1725     00-100    NBTR       NBTR Management
   46455   071/1909     00-101    NBTR       NBTR Management
   46455   071/1948     00-101    OBC        Clk Adj fr 0.00 to 20.6 msec/day
   46462   072/0608     00-101    NBTR       NBTR Management
   46469   072/1728     00-101    NBTR       NBTR Management
   46469   072/1809     00-103    NBTR       NBTR Management
   46474   073/0107     00-104    AXIS       Off
   46477   073/0610     00-103    NBTR       NBTR Management
   46477   073/0610     00-105    OBC        Clk Adj fr 20.6 to 0.00 msec/day
   46484   073/1730     00-103    NBTR       NBTR Management
   46484   073/1812     00-106    NBTR       NBTR Management
   46492   074/0612     00-106    NBTR       NBTR Management
   46499   074/1734     00-106    NBTR       NBTR Management
   46500   074/1955     00-107    NBTR       NBTR Management
   46507   075/0615     00-107    NBTR       NBTR Management
   46514   075/1737     00-107    NBTR       NBTR Management
   46514   075/1816     00-108    NBTR       NBTR Management
   46522   076/0617     00-108    NBTR       NBTR Management
   46524   076/0914     00-110    WINDII     Off
   46529   076/1741     00-109    NBTR       NBTR Management
   46536   077/0543     00-109    NBTR       NBTR Management

______________________________________________________________________________

                                   APPENDIX B
                       OUT-OF-LIMITS & ALERTS OCCURRENCES
                          Week ending 17 March 2000

The following Out-Of-Limits occurrences were detected:

     MNEMONIC        STATE     DESCRIPTION                        ORBITS
     ---------       -----     ------------                       ------
     HRPSEQBIMON     Y-HI      PSE Quiet Bus Current Monitor      46450
     PEA1IMONE       Y-HI      AXIS Input Current Monitor         46469
     HRPTSPBIMON     R-LO      PTS Pulse Bus Current Monitor      46485
     HRPSEPBIMON     R-LO      PSE Pulse Bus Current Monitor      46485
     WIQBVOLTAGE     Y-LO      WINDII Quite Bus Voltage           46
     HRPSEQBIMON     Y-HI      PSE Quiet Bus Current Monitor      46
     WIQBVOLTAGE     Y-LO      WINDII Quite Bus Voltage           46511
     HRPSEQBIMON     Y-HI      PSE Quiet Bus Current Monitor      46511

The following ALERT occurrences were detected:

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

_______________________________________________________________________________

                                    APPENDIX C
                         CLOCK & SOLAR ARRAY RATE CORRECTIONS
                              Week ending 17 March 2000

                               CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT                TIME                      CLOCK RATE CHANGE
     -----                ----                      -----------------
     46455             071/19:48 (11 Mar 00)       from 0.00 to 20.6 msec/day
     46477             073/06:10 (13 Mar 00)       from 20.6 to 0.00 msec/day

_______________________________________________________________________________

                                    APPENDIX D
                            UARS BATTERY PERFORMANCE DATA
                              Week ending 17 March 2000

     07 Mar 2000 - GMT Day 067 Beta = 47.9 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   -50.4/-72.8   -3.05/-4.31  +0.0/+0.0     16.0      0.000     0.0
2   +22.4/-22.4   +5.47/+4.51  +27.2/-15.2   24.8      1.042     21.3
3   +44.8/-5.6    +4.51/+3.23  +26.8/-15.6   24.8      1.040     21.0

     17 Mar 2000 - GMT Day 077 Beta = 11.3 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   -44.8/-67.2   -3.05/-4.31  +0.0/+0.0     16.0     0.000     0.0
2   +22.4/-5.6    +5.79/+5.15  +30.0/-12.8   24.2     1.030     22.0
3   +50.4/+11.2   +4.51/+3.87  +28.8/-12.8   24.1     1.027     21.7

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





                                  APPENDIX E
                              UARS ANOMALY REPORTS
                            Week ending 17 March 2000

                           NEW ANOMALY REPORTS GENERATED
     AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
     ------     ------     -----     ----        ---     -----------------
     00-005     FOT        46447     071/0606    14170   Generic Late Acq.
     00-005     FOT        46461     072/0428    14170   Generic Late Acq.
     00-005     FOT        46514     075/1737    14170   Generic Late Acq.

                         ANOMALY CLOSURE INFORMATION RECEIVED
     AR NO.     SUBSYS     ORBIT     TIME        TTR      PROBLEM/DATA LOSS
     ------     ------     -----     ----        ---      -----------------
                                No closure information received

                          ANOMALY INVESTIGATION REPORTS GENERATED
     AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
     ------     ------     -----     ----        ---     -----------------
                                No new reports generated

                                   OPEN ANOMALY REPORTS
     AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
     ------     ------     -----     ----        ---     -----------------
    99-064      FOT        44135     10/8-9/99   N/A     HRDI Cal Lamp Errors
    99-071      FOT        44398     299/1212    21512   TPF Not Receiv 512                                                 
00-005          FOT        see list  March 00    14170   Generic Late Acq.

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