UARS Weekly Status Report

12 January 2001




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                UARS WEEKLY STATUS REPORT - 12 JAN 2001

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

SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible. We
continue to gather enough data to meet all the SOLSTICE science objectives
during this period of reduced tape recorder operations.

This week we successfully executed a number of observations of Mercury. A
special thank you to Rich Beck and the folks at the MPG for their help in
scheduling this activity.

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

SUSIM performed its daily solar scans of the sun during periods of
predicted UARS telemetry.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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MLS
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Nothing received.

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

HRDI continues to function normally, making wind measurements during
the sunlit parts of orbits nearly every day, and measuring nighttime 
winds when power is available.

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

Nothing received.

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MPG
***********

The MPG assisted with the scheduling of observations of 
Mercury by the SOLSTICE instrument.

Daily processing of instrument Daily Activity Plans continues
with no problems. Instrument operations schedule is now complete
to 9 February 2001.

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

UARS CDHF REHOST:
   -  We shall be sending out to all PI/SW groups, responses to all
      concerns (SUSIM,GPI), we have had regarding the results of comparing
      rehost and current system results. We have found reasonable reason for
      differences and  we will send this information out in the next few days.
    - Our plans are to go operational on the rehost system on January 31,2001.
      Operational status means that L0,NRT,Quicklook and correlative ingests
      and current day processing will be done on the REHOST system. The
      old system will still be available until we migrate all old UARS data
      to the REHOST system.   
UARS 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.
 -  ***LEVEL0 for UARS DAYS 3399 and 3403 RE-INGESTED for "Better Quality"***
              1 day ATT (7.3) PROD (3403)             (1R-1C=0L)
              1 day OBC (3.4) PROD (3403)             (1R-1C=0L)
              1 day SEN (5.0) PROD (3399)             (1R-1C=0L)
 - The CDHF is "catching up" with the HALOE production processing.  LEVELS 2-3
   has been on hold since 21-December-2000.  The Auxiliary (Sol) data was
   delayed due to extensive preventive maintenance at the Solar Terrestrial 
   Dispatch System.  The backlog of data started becoming available 8-Jan-2001.
   HALOE software representative has been notified.
 DAAC DATA:      
   -  A priority is being given to the preview and loading of MLS V5 into the
      DAAC Transfer Tables.  The data created in the month of October and
      November, 2000 has been loaded into the DAAC Transfer Tables.  Plans are
      to start previewing the data created in the month of December, 2000.
   -  Data created in the month of October, 2000 has been loaded into the
      DAAC Transfer Tables for HALOE, NMC, and UKMO. DAAC has been notified.    
                  
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FOT
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                        REPORTING PERIOD

This report covers 30 December 2000 (Orbit 50851, GMT Day 365) through 05 
January 2001 (Orbit 50955, GMT Day 005).

                     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
        ACRIM        365/2245    50865     Power OFF
        PEM          365/2245    50865     Power OFF
        SUSIM        365/2245    50865     Power OFF
        HRDI         366/0029    50866     Low Power mode
        ACRIM        002/0004    50895     Power ON
        SOLSTICE     002/0143    50896     Power ON
        SUSIM        002/0324    50898     Power ON
        PEM          002/1244    50903     ZEPS/HEPS Day only
        HALOE        004/0006    50925     Power ON


A Forward-to-Reverse Yaw Around maneuver (number 95) was successfully executed 
in Orbit 50878 beginning 366/14:57:50 and completing at 366/15:34:50 on 31 
December 2000.  The SOLSTICE instrument was in day only and all other 
instruments were in their off or standby mode (including HRDI and PEM).  Due to 
the SA position at 269 degrees, the effective night length of the spacecraft 
after the maneuver was approximately 50.57 minutes.  Post maneuver analysis of 
data indicate that during the Yaw Around, the end-of-night load bus voltage was 
25.14 volts and the average depths of discharge (DODs) on Batteries 2 and 3 
were approximately 22.51and 21.90 percent respectively.  The next (reverse-to-
forward) YAW is scheduled for 09 February 2001 (DOY 040).

The beta angle ranged between the angles of 05.3 degrees to 30.4 degrees for 
this report period.  The beta angle is now increasing towards a maximum angle 
of 77 degrees on 21 January 2001 (DOY 021).

Spacecraft battery 1, 2, and 3 performance monitoring continues. Battery 1 
remains OFF the charge realy. Battery 2 and Baterry 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 and 1.0 degrees C respectively.  Additional battery performance data 
for each battery on 28 December 2000 and 05 January 2001 are provided in 
Appendix D.

The clock error ranged from ~10.3 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   =  00
¥    ALERTS          =  00

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

 *Data not available this week.

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

¥     FOT           =   01

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

TRANSPONDER FREQUENCIES:
· Transponder A:  00/315  -  2287.496493
· Transponder B:  00/314  - 2287.498584
 
 
                     GROUND SYSTEM OPERATION
 
One (1) 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 00/342 show the observatory data loss to be 300 hours, 08 
minutes, 41.256 seconds. This shows an overall increase of 6 minutes and 52.288 
seconds since the last report period.  This is a 0.39 percent data loss, which 
equals a 99.61 percent data capture for the mission.
 
 The increase of 6 minutes and 52.288 seconds occurred over one (5) days:
 
· 01 minutes and 16.752 seconds on Day 364 due to a data hit.
· 01 minutes and 18.656 seconds on Day 365 due to a data hit.
· 13.552 seconds on Day 366 due to a data hit.
· 03 minutes and 36.032 seconds on Day 1 due to a command uplink failure 
  TTR#23380.
· 27.296 seconds on Day 2 due to a data hit.

                   OTHER SIGNIFICANT EVENTS

                   UARS SATELLITE OPERATIONS

The Three Axis Magnetometer (TAM) was put back into update mode on 03 January 
2001.  After tuning some of the noise parameters and sensor alignments, the TAM 
is performing well enough to keep it in update mode continuously.  The FOT 
plans to fly on TAM only through the weekend and into next week, contingent on 
the FSS residuals not exceeding 1500 arc seconds.

The Flight Software patch to account for the nonorthoganality of the TAM was 
tested this week and is scheduled to be uplinked on 09 January 2001.  This 
patch should further improve the TAM's performance.  If the TAM continues to 
operate this well, UARS will be able to fly through the upcoming high beta 
period on TAM alone without having to perform a yaw offset maneuver.


                            MEETINGS

The FOT attended a TAM Attitude Meeting on 02 January 2001.
The FOT attended a UARS Monthly Status Meeting on 03 January 2001.


                    FUTURE SIGNIFICANT EVENTS


The next UARS Yaw slew is scheduled for December 31, 2000 (DOY 366).  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 05 January 2001

                *Data not available this week.

_____________________________________________________________________

                          APPENDIX B
             OUT-OF-LIMITS & ALERTS OCCURRENCES
                 Week ending 05 January 2001

The following Out-Of-Limits occurrences were detected:

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 05 January 2001

                CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME     CLOCK RATE CHANGE
-----     -----     -----------------
-None this report period

___________________________________________________________________

                        APPENDIX D
             UARS BATTERY PERFORMANCE DATA
              Week ending 05 January 2001


     28 Dec 2000 - GMT Day 363 Beta = 10.7 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    +728.0/+728.0  -3.68/-4.94  +0.0/+0.0    14.2    0.000     0.0
2    +11.2/-22.4    +4.51/+3.87  +29.6/-13.2  26.2    1.020     19.9
3    +22.4/-22.4    +3.23/+2.60  +28.8/-12.8  26.1    1.020     19.3


     05 Jan 2001 - GMT Day 005 Beta = 30.4 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    +728.0/+728.0  -3.05/-4.31  +0.0/+0.0    14.2    0.000     0.0
2    +0.0/-44.8     +5.47/+4.51  +16.0/-15.2  25.9    1.030     21.0
3    +11.2/-22.4    +4.51/+3.55  +15.6/-15.2  25.8    1.030     20.9


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

_______________________________________________________________________________


                               APPENDIX E
                      UARS ANOMALY REPORTS
                    Week ending 05 January 2001

                   NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT     TIME       TTR     PROBLEM/DATA LOSS
------     ------     -----     ----       ---     -----------------
01-000     FOT        50890     001/1605   23380   System failover at WSGT


               ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.     SUBSYS     ORBIT     TIME       TTR     PROBLEM/DATA LOSS
------     ------     -----     ----       ---     -----------------
00-047     FOT        see list  Nov 00     14170   Generic Late Acq.


             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
------     ------     -----     ----       ---     -----------------
00-053     FOT        50168     319/1113   23157    Late Acquisition
00-054     FOT        50280     326/2147   23187    RESET PTP /2:39 32K
01-000     FOT        50890     001/1605   23380    System failover at WSGT

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