UARS Weekly Status Report

13 October 2000




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                UARS WEEKLY STATUS REPORT - 13 OCT 2000

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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.
Our solar data is not affected by the larger than normal pointing errors
since they are within our calibrations.

Additionally, we continue to gather enough data to meet all the SOLSTICE
science objectives during this period of reduced tape recorder operations.
However, level2 processing is halted due to deficiencies in the OA_SSPP_ATT
service. CDHF and CSC personnel are working on the problem and plan to have
a patch by the end of October.

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

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

We are preparing to begin to reprocess the SUSIM UV spectral
irradiances to  data version V21 in the next few weeks.

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

Nothing received.

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

     The PEM zenith spectrometers are activate in daylight mode.

     At the present time, PEM energy deposition from its spectrometers is not 
being generated.  Recent data configuration changes have affected PEM software 
causing multiple failures.  These failures are being reviewed by the PEM team.
In order to correct for new telemetry requirements, PEM will need to update 
processing code with a patch delivery.  The delivery patch may include changes 
which would allow the PEM software to execute on a DEC Alpha machine.  GSFC is
helping PEM with some DEC Alpha particulars which have caused PEM level 3
code to fail on DEC Alpha machines (software below level 3 executes on the
DEC Alpha).

    Updated HEPS calibration parameters have been finalized and are ready for 
delivery.  Updated MEPS quality calibration files have been finalized and are 
ready for delivery.  Level 3 software errors, discovered by Dr. Dean Pesnell, 
have been fixed; his suggestions have been incorporated with in the PEM 
production code.  Both updated HEPS and MEPS calibration data, along with the 
Level 3 code changes, will influence the in-situ energy deposition predictions,
so new versions of PEM energy deposition Level 3 files will be generated.

*Beginning of power orbit day (PEM activation): array current >5 amps, array 
     voltage >53.5 volts, and battery current >2.0 amps.  
 End of power orbit day (PEM deactivation): time in power orbit day >4 minutes,
     array current <9 amps, and battery currents <0.2 amps.
 Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta.

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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
***********

Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinate with the Flight
Operations Team and to assist the Project Scientist in the
scheduling of instrument operations.

The UARS calendar for year 2001 is now available on the UARS
homepage, under "What's New" section. (http:/umpgal.gsfc.nasa.gov)

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

HIGHLIGHTS       
         UOAS OA_SSPP_ATT         
      -  Need to debug additional UOAS OA_SSPP_ATT gap scenarios:
         2) gap at end of day,   time change, no gap at begin of next day.
         3) tests run in RSS need to be run in PDS mode and possibly Menu mode.
      -  Need to code comparable fix in OA_SAT_ATT and test in debug.
      -  Plan to have patch by end of month.
 DAAC DATA:    
   -  MLS Version 5 data is being previewed and loaded into the DAAC Transfer
      Tables.  When all of the Version 5 has been loaded into the DAAC tables,
      various fields will need updated before DAAC (James Johnson) can reveal/
      make available to the User Community.
   -  Waiting response from WINDII that Version 11 Quality fields have been
      updated.      
UARS CDHF REHOST:
   -  Successful processing on Rehost System:
       Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, 
       HRDI, MLS, SUSIM, Solstice, and WINDII.
   -  SUSIM v7.2 software representative Ed Esfandiari notified parallel
      testing completed.  *SUSIM responded with concerns regarding the output
      product which is being investigated.
   -  HRDI v4.4 software representative Mr. Jim Raines was notified parallel
      testing completed.  *HRDI responded and is still in process of validating
      the output product.
   -  GPI V4.05 tested successfully against the HRDI V4.4 Level 3AL data.
      Frank Huang was requested to validate the GPI output product.  *Frank
      responded with questions and some concerns.    
   -  SOLSTICE v4.62 software representative PI Barry Knapp has successfully
      validated the parallel testing output.     
   -  HALOE v4.82 software representative Mr. Lance Deaver was notified the
      parallel test days completed.  *HALOE has responded that they see no major
      differences in the output product, but have 3 more species to check out
      and will respond further this week.  Small differences are possibly
      attributed to interpolation routines.        
   -  WINDII V5.11A software representative Mr. Brian Solheim requested parallel
      processing on test days.  Testing continues.
   - July data ingested on the Rehost System for NMC and UKMO was successfully
      previewed and loaded into the DAAC Transfer Tables.  DAAC (James Johnson)
      has been notified to test his transfers.
                  
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FOT
***********

                                REPORTING PERIOD

This report covers 30 September 2000 (Orbit 49486, GMT Day 274) through 06 
October 2000 (Orbit 49590, GMT Day 280).

                             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         279/0532     49564           Off
    HALOE         279/0953     49566           On
    HALOE         280/1232     49584           Off
    HALOE         280/1555     49586           On

The beta angle ranged between the angles of 44.1 degrees to 51.0 degrees for 
this report period.  The beta angle is now decreasing toward a minimum angle of 
2 degrees on 23 October 2000 (DOY 297).

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 1.0 degrees C.  Additional battery performance data for each 
battery on 29 September 2000 and 06 October 2000 are provided in Appendix D.

The clock error ranged from -12.7 to 11.8 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  =  01
¥    ALERTS         =  00

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

¥    FOT            =  25
¥    HALOE          =  04

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:
· Transponder A:  00/221  -  2287.496937
· Transponder B:  00/244  -  2287.499127


                           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 00/272 show the observatory data loss to be 298 hours, 29 
minutes, 18.483 seconds (an increase of 2 minutes 18.252 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 2 minutes 18.252 seconds occurred over two (2) days:

· 1 minute 20.672 seconds on Day 276 due to a data hit,
· 0 minutes 58.840 seconds on Day 278 due to a data hit.

                          OTHER SIGNIFICANT EVENTS

                          UARS SATELLITE OPERATIONS

The FOT powered off FHST-1 on 29 September 2000.  The tracker will remain off 
and UARS will fly on FSS and gyros alone.  Should the attitude start to drift 
the FOT has implemented a procedure to manually correct the attitude via an FDF 
calculated attitude correction.  UARS will continue to fly in this manner until 
the TAM and FSS attitude control solution is put into place.  Testing continues 
daily to get this mode operational.

                                  MEETINGS

The FOT attended a meeting to discuss UARS attitude control on 02 and 04 
October 2000.

  
                         FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for October 22, 2000 (DOY 297).  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 06 Oct 2000

ORBIT    AOS NO.   SUBSYS    REASON
-----    --- ---   ------    -------
49489    274/0525   00-525   NBTR NOOPS D274
49495    274/1250   00-526   OBC Clk Adj 20.6 to 0.0 msec/day
49497    274/1726   00-525   NBTR NOOPS D274
49497    274/1806   00-527   NBTR NOOPS D275
49512    275/1809   00-528   NBTR NOOPS D276
49520    276/0610   00-528   NBTR NOOPS D276
49526    276/1549   00-529   OBC GENASCII/ TABLE 51
49527    276/1811   00-530   NBTR NOOPS D277
49531    277/0052   00-531   OBC Clk Adj 0.0 to 20.6 msec/day
49535    277/0612   00-530   NBTR NOOPS D277
49540    277/1409   00-532   OBC GENASCII/TABLE 51
49543    277/1910   00-533   NBTR NOOPS D278
49544    277/2132   00-534   TAM2 GENASCII/TABLE 53
49549    278/0531   00-533   NBTR NOOPS D278
49555    278/1411   00-536   OBC GENASCII/TABLE 51
49556    278/1552   00-537   OBC GENASCII/TABLE 15
49557    278/1814   00-535   NBTR NOOPS D279
49564    279/0532   00-535   NBTR NOOPS D279
49564    279/0532   00-538   OBC Clk Adj 20.6 to 0.0 msec/day
49564    279/0532   00-539   HALOE POWER OFF/ TBAT HI
49566    279/0953   00-540   HALOE POWER ON
49570    279/1413   00-541   OBC GENASCII/TABLE 51
49572    279/1733   00-535   NBTR NOOPS D279
49572    279/1816   00-542   NBTR NOOPS D280
49579    280/0534   00-542   NBTR NOOPS D280
49584    280/1232   00-543   HALOE POWER OFF
49585    280/1415   00-544   OBC GYRO PREDICTS
49586    280/1555   00-545   HALOE POWER ON
49587    280/1817   00-546   NBTR NOOPS D281
_______________________________________________________________________________

                                APPENDIX B
                   OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 06 Oct 2000

The following Out-Of-Limits occurrences were detected:

MNEMONIC    STATE    DESCRIPTION                ORBITS
---------   -----    ------------               ------
HATBAT      Y-HI     BOLOMETER AREA TMP         49581-82


The following ALERT occurrences were detected:

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

_______________________________________________________________________________

                                  APPENDIX C
                     CLOCK & SOLAR ARRAY RATE CORRECTIONS
                           Week ending 06 Oct 2000

                         CLOCK DRIFT RATE ADJUSTMENTS

ORBIT           TIME                            CLOCK RATE CHANGE
-----           ----                            -----------------
49495          274/1250 (30 September)          from 20.6 to 0.00 msec/day
49531          277/0052 (03 October)            from 0.00 to 20.6 msec/day
49564          279/0532 (05 October)            from 20.6 to 0.00 msec/day

___________________________________________________________________________

                                  APPENDIX D
                        UARS BATTERY PERFORMANCE DATA
                           Week ending 06 Oct 2000


 29 Sept 2000 - GMT Day 273 Beta = 41.5 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    +16.8/-78.4    +5.47/+4.51  +27.2/-15.2   25.1      1.030    19.7
3    +16.8/-44.8    +4.51/+3.23  +27.2/-15.2   25.1      1.020    19.3


 06 Oct 2000 - GMT Day 280 Beta = 51.6 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/-4.62  +0.0/+0.0    14.2 0.  000       0.0
2    +16.8/-56.0    +4.83/+3.23  +24.8/-15.   2 25.4 1.040       20.5
3    +11.2/-72.8    +3.87/+2.29  +25.2/-15.   2 24.8 1.040       20.0


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

                                 APPENDIX E
                            UARS ANOMALY REPORTS
                          Week ending 06 Oct 2000

                         NEW ANOMALY REPORTS GENERATED
AR NO.   SUBSYS    ORBIT      TIME         TTR      PROBLEM/DATA LOSS
------   ------    -----      ----         ---      -----------------
00-042   FOT       49534      277/0529     14170    Generic Late Acq.

                     ANOMALY  CLOSURE INFORMATION RECEIVED
AR NO.   SUBSYS   ORBIT       TIME         TTR      PROBLEM/DATA LOSS
------   ------   -----       ----         ---      -----------------
00-041   FOT      see list    Sept 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
------   ------   -----       ----         ---       -----------------
00-042   FOT      see list    Oct 00      14170      Generic Late Acq.
00-040   FOT      48854       231/2111    22831      Data Dropout
00-032   FHST     48211       188/2242    N/A        FHST 2 Anomaly


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