UARS Weekly Status Report

28 January 2000




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                UARS WEEKLY STATUS REPORT - 28 JAN 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.

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

SUSIM continues to gather a minimum set of daily solar scans scheduled
for periods of predicted telemetry.

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

Nothing receieved.

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

Nothing received.

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

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. 

Various options for future Narrow Band Tape Recoder operations
are being explored, and the MPG is supporting these studies.

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

The CDHF continues to closely monitor production jobs CPU and Wallclock 
usage and notify PI's of any discrepancies encountered in the processing as 
a result of the UARS Spacecraft Anomaly.
                        
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.
        33 days WIN (5.11A) PROD (L1-L3)         (520R-344C-13F=163L)       

DAAC DATA:
   -  DAAC data created in the month of November 1999 has been loaded into the
      DAAC Transfer Tables for HALOE, PEM, NMC, and UKMO. 
   -  The CDHF will load December 1999 current day DAAC data in February 2000.
                                      
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FOT
***********

                                    REPORTING PERIOD    

This report covers 15 January, 2000 (Orbit 45604, GMT Day 015) through 21 
January 2000 (Orbit 45708, GMT Day 021).


                                   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        015/0103     45605     AXIS-1 On
                      WINDII      017/0110     45635     On

The beta angle ranged between the angles of 30.7 degrees to 59.4 degrees for 
this report period.  The beta angle is now increasing toward a maximum angle of 
76.0 degrees on 27 January 1999 (DOY 027).

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 14 January 2000 and 21 January 2000 are provided in Appendix D.

The clock error ranged from 12.5 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.

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

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

%     FOT             =     09
%     HALOE           =     01
%     PEM             =     01
%     WINDII          =     01

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

%     FOT             =     01

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

TRANSPONDER FREQUENCIES:
7 Transponder A:  99/358  -  2287.496855
7 Transponder B:  99/365  -  2287.499111


                                 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 00/020 show the observatory data loss to be 564 hours, 16 
minutes, 10.825 seconds (an increase of 01 hours 09 minutes 20.224 seconds 
since the last report period).

The increase of 01 hours 09 minutes 20.224 seconds occurred over six (5) days:

- 18 minutes 18.528 seconds on Day 014 due to an unspecified problem.
- 11 minutes 54.048 seconds on Day 015 due to an unspecified problem.
- 02 minutes 42.752 seconds on Day 016 due to an unspecified problem.
- 10 minutes 24.352 seconds on Day 019 due to an unspecified problem.
- 26 minutes 00.544 seconds on Day 020 due to an unspecified problem.

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

No significant satellite operations to report.


                                      MEETINGS

20 January, 2000 - The FOT attended a meeting to discuss the status of the tape 
recorder.  Three TDRSS operations were discussed in detail.  The FOT was given 
some action items that are to delivered by next weeks tape recorder anomaly 
meeting (January 26).


                              FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for February 15, 2000 (DOY 046).  This 
maneuver will be a Reverse to Forward Flight maneuver (Southern 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 21 January 2000

           ORBIT     AOS        NO.     SUBSYS     REASON
           -----     ---        ---     ------     -------
           45605   015/0103    00-014   PEM     Power ON, AXIS 1
           45612   015/1302    00-015   OBC     Clk Adj fr 0.00 to 20.6 msec/day
           45616   015/2002    00-016   NBTR     NBTR NOOPS
           45630   016/1824    00-017   NBTR     NBTR NOOPS
           45635   017/0110    00-018   WINDII     Power ON
           45640   017/0948    00-019   OBC     Clk Adj fr 20.6 to 0.00 msec/day
           45645   017/1827    00-020   NBTR     NBTR NOOPS
           45661   018/1912    00-021   NBTR     NBTR NOOPS
           45667   019/0521    00-022   HALOE     Power OFF, High Temp
           45667   019/0521    00-023   OBC     Clk Adj fr 0.00 to 20.6 msec/day
           45675   019/1837    00-024   NBTR     NBTR NOOPS
           45694   020/2339    00-025   NBTR     NBTR Playback

_______________________________________________________________________________

                                      APPENDIX B
                           OUT-OF-LIMITS & ALERTS OCCURRENCES
                              Week ending 21 January 2000

The following Out-Of-Limits occurrences were detected:

              MNEMONIC        STATE     DESCRIPTION               ORBITS
              ---------       -----     ------------              ------
              HRPTSPBIMON     Y-HI     HRDI PB CURRENT MONITOR    continuous
              HRPTSPBIMON     Y-HI     HRDI PB CURRENT MONITOR    continuous
              HRPTSPBIMON     Y-HI     HRDI PB CURRENT MONITOR    45634-41
              PWICDH          Y-LO     CDH POWER LOW              45655
              PEAXTHERM6E     Y-HI     PEM AXIS THERMISTOR 6      45704,05
              PWICDH          Y-LO     CDH CURRENT                45704

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 21 January 2000

                               CLOCK DRIFT RATE ADJUSTMENTS

              ORBIT         TIME                    CLOCK RATE CHANGE
              -----         ----                    -----------------
             45612        015/13:08 (15 Jan 00)     from 00.0 to 20.6 msec/day
             45640        017/09:50 (17 Jan 00)     from 20.6 to 00.0 msec/day
             45667        019/05:23 (19 Jan 00)     from 20.6 to 00.0 msec/day

_______________________________________________________________________________

                                      APPENDIX D
                              UARS BATTERY PERFORMANCE DATA
                               Week ending 21 January 2000


     14 Jan 2000 - GMT Day 014 Beta = 30.7 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/-78.4    -3.05/-4.31    +0.0/+0.0    16.2    0.000     0.0
  2     +11.2/-78.4    +6.44/+4.83   +30.4/-15.2   24.2    1.023     22.5
  3     +33.6/-67.2    +5.15/+3.87   +29.6/-16.0   24.2    1.017     22.3


            21 Jan 2000 - GMT Day 021 Beta = 59.4 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     -61.6/-89.6    -3.05/-4.94    +0.0/+0.0    16.2     0.000     0.0
  2     +11.2/-22.4    +4.51/+2.60   +24.0/-15.2   26.4     1.040     17.6
  3     +33.6/-11.2    +3.23/+1.66   +23.2/-14.4   26.4     1.038     17.3

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



                                    APPENDIX E
                                UARS ANOMALY REPORTS
                               Week ending 21 January 2000

                              NEW ANOMALY REPORTS GENERATED
       AR NO.   SUBSYS  ORBIT       TIME      TTR      PROBLEM/DATA LOSS
       ------   ------  -----       ----      ---      -----------------
       00-001   FOT     45702     021/1325    14170    Generic Late Acquisition

                             ANOMALY CLOSURE INFORMATION RECEIVED
       AR NO.   SUBSYS   ORBIT      TIME     TTR       PROBLEM/DATA LOSS
       ------   ------   -----      ----     ---       -----------------
                               No new reports generated

                            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 Receiving 512 PB
       00-001   FOT    See list   January    14170    Generic Late Acquisition

	 	SEVNTFW00/03