UARS Weekly Status Report

11 May 2001




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                UARS WEEKLY STATUS REPORT - 11 MAY 2001

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

The cause of the operational anomaly last week was determined to be a wrong
load sent to the instrument. No damage occured because of this error.
SOLSTICE continues to operate normally, taking 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.

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

The calibration of SUSIM using three of its deuterium lamps begun last
week was successfully completed.  Our thanks go to the UARS Project
Engineers, the Flight Operations, and Mission Planning Teams for
planning and directing the UARS spacecraft and ground systems for
closed loop SSPP pointing.

After the calibration, SUSIM performed its daily solar scans for the
remainder of the week during periods of predicted UARS telemetry.

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

Nothing received.

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

PEM/AXIS was activated in its full power mode on April 30 and was 
deactivated on May 7.  At the current time, AXIS is not generating energy 
deposition.  SwRI is looking into this.  Tests of AXIS production code on 
the rehost computer are continuing.

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).

PEM has examined its processed files of the rehost machine and has found 
that no differences exist in the Level 1 and Level 2 output files which were 
generated the rehost when the same input data was used on CDHF and CDHFB.
PEM is now confident that output generated by PEM 3.32, Jobs 1 & 2, on the 
rehost system is valid and correct.

The PEM team is working on replacing the PEM:: machine with a DEC Alpha 
machine to be called PEM2K::.  Tests of the NRT data transfer from CDHF2:: 
through PEM2K:: to the unix computer running the PEM GSE software show no 
difference between equivalent NRT files transferred from PEM::.  Thus, NRT 
data from CDHF2:: is captured correctly on PEM2K::.  Tests of the NRT data 
transfer from CDHFB:: were not successful from both PEM:: and PEM2K::.  
Results of the test of NRT data transfers from the rehost computer were
successful for individual files which exist on CDHFB::.

PEM has been working with GSFC on allowing commanding of the PEM
instrument by creating DAPs on the PEM2K machine and submitting them to the 
CMS.  PEM2K:: now is able to communicate with the CMS, but the CMS does
not recognize PEM2K:: as an authorized site for instrument daily activity
plan submission.  PEM is waiting for a solution from GSFC.

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.

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

Nothing received.

***********
MLS
***********

Nothing received.

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

Nothing received.

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

Nothing received.

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

The MPG participated in a UARS Battery Status Review
Meeting on 10 May 2001.  Daily processing of instrument 
Daily Activity Plans continues with no problems. The 
instrument operations schedule is now complete
to 28 June 2001.
 
***********
CDHF
***********

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.
          ***LEVEL0 for UARS DAYS 3514 and 3515 re-ingested with
             additional data on current system.
            2 days ATT V7.3 (PROD) (3514, 3515)      (2R-2C=0L)
UARS CDHF REHOST:
   - NRT user access testing occurring this week.
   - LEVEL0 for UARS DAYS 3514 and 3515 was re-ingested with additional
     data.  Attitude and Observatory log were reprocessed for these days.
     FDF indicated no reprocessing of Sensor software was necessary.           
DAAC DATA:
   -  CLAES (OUTPUT 9) data created in May, 1999 has been loaded into the
      DAAC Transfer Tables.  DAAC has been notified.
   -  CLAES (OUTPUT 9) data created in June, 1999 has been previewed in
      preparation for sending to the DAAC.  The list of June files has been
      forwarded to CLAES for review and approval.
                  
***********
FOT
***********
                         REPORTING PERIOD

This report covers 28 April 2001 (Orbit 52635, GMT Day 118) through 04 
May 2001 (Orbit 52740, GMT Day 124).

                        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          
     AXIS 1&2     120/0102   52666     Power ON
     SOLSTICE     122/0142   52696     SOLSTICE REBOOT
     HALOE        123/1310   52719     Power OFF (TBAT TEMP)     

The beta angle ranged between the angles of 36.1 degrees to 60.9 degrees 
for this report period.  The beta angle is now increasing towards a 
maximum angle of 74 degrees on 09 May 2001 (DOY 129).

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 1.2 and 1.3 degrees C.  Additional 
battery performance data for each battery on 27 April 2001 and 4 May 
2001 are provided in Appendix D.

The clock error ranged from Ð10.8 to 10.5 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  =  04
¥     ALERTS         =  02

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

¥     FOT            =  25
¥     HALOE          =  01
¥     AXIS           =  01
¥     SOLSTICE       =  02

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

¥     FOT            =  03

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

TRANSPONDER FREQUENCIES:
· Transponder A:  00/316  - 2287.496493
· Transponder B:  01/119  - 2287.499116


                    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 01/067 show the observatory data loss to 
be 300 hours, 18 minutes, 29.768 seconds. This shows no change since the 
last report period. This is a 0.39 percent data loss, which equals a 
99.61 percent data capture for the mission.

                     OTHER SIGNIFICANT EVENTS

                     UARS SATELLITE OPERATIONS

The new flight software patch uplinked on 25 April 2001 continues to be 
monitored this week.  The FOT is pleased with its overall performance 
and is fine-tuning the TAM alignment by loading new alignment matrices.  
An accurate alignment is needed to get ready for the loss of sun in the 
field of view of the FSS on 5 May 2001.  

                            MEETINGS

The FOT attended a UARS Monthly Status Meeting on Wednesday, May 02, 
2001.The FOT attended a UARS FSW CCB Meeting on Thursday, May 03, 2001.

                   FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 30 May 2001 (DOY 150).  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 04 May 2001

ORBIT     AOS        NO.       SUBSYS     REASON
-----     ---        ---       ------     ------
52639     118/0434   01-270    NBTR       NBTR PBK / RTS-58
52640     118/0653   01-270    NBTR       NOOPS D-118
52647     118/1958   01-271    NBTR       NOOPS D-119
52647     118/1958   01-272    OBC/CLK    Clk Adj 20.6 to 0.00 msec/day
52653     119/0436   01-271    NBTR       NBTR PBK / RTS-58
52655     119/0655   01-271    NBTR       NOOPS D-119
52662     119/1818   01-273    NBTR       NOOPS D-120
52666     120/0102   01-274    AXIS 1&2   Power ON
52668     120/0437   01-273    NBTR       NBTR PBK / RTS-58
52670     120/0657   01-273    NBTR       NOOPS D-120
52675     120/1452   01-275    MACS       TAM ALIGNMENT
52677     120/1819   01-276    NBTR       NOOPS D-121
52684     121/0620   01-276    NBTR       NBTR PBK / RTS-58
52685     121/0659   01-276    NBTR       NOOPS D-121
52691     121/1639   01-277    OBC        Clk Adj 0.00 to 20.6 msec/day
52693     121/2042   01-279    NBTR       NOOPS D-122
52696     122/0142   01-280    SOLSTICE   SOLSTICE REBOOT
52696     122/0255   01-281    SOLSTICE   SOLSTICE IGNORE CMD
52698     122/0439   01-279    NBTR       NBTR PBK / NBTR REC CMDS
52702     122/1031   01-279    NBTR       NBTR PBK / RTS-58
52703     122/1307   01-279    NBTR       NOOPS D-122
52709     122/2140   01-283    NBTR       NOOPS D-123
52713     123/0440   01-283    NBTR       NBTR PBK / RTS-58
52718     123/1203   01-283    NBTR       NOOPS D123
52719     123/1310   01-284    HALOE      Power OFF (TBAT TEMP)
52721     123/1721   01-285    OBC        Clk Adj fr 20.6 to 0.00 msec/day
52729     124/0519   01-287    SSPP       enable SSPP FDC
52729     124/0621   01-288    SSPP       SSPP FDC recovery & noops
52738     124/2001   01-289    NBTR       PLAYBACK

________________________________________________________________________

                             APPENDIX B
                OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 04 May 2001

The following Out-Of-Limits occurrences were detected:

MNEMONIC     STATE     DESCRIPTION               ORBITS
--------     -----     -----------                ------
SOSNTEVLTG   R-LO     SOLSTICE N TUBE VOLTAGE     52696,7
SOSFTEVLTG   R-LO     SOLSTICE F TUBE VOLTAGE     52696,7
SOSGTEVLTG   R-LO     SOLSTICE G TUBE VOLTAGE     52696,7
HATBAT       Y-HI     HALOE BOLOMETER AREA TEMP   52715,6


The following ALERT occurrences were detected:

MNEMONIC         DESCRIPTION               ORBITS
--------         -----------               ------
ACHSKPG3REDL     ACRIM RED LOW VOLTAGE     52709

________________________________________________________________________

                           APPENDIX C
             CLOCK & SOLAR ARRAY RATE CORRECTIONS
                   Week ending 04 May 2001

                  CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME         CLOCK RATE CHANGE
-----     -----        -----------------

52647     118/2008     Clk Adj from 20.6 to 0.00 msec/day
52691     121/1650     Clk Adj from 0.00 to 20.6 msec/day
52721     123/1721     Clk Adj from 20.6 to 0.00 msec/day
________________________________________________________________________

                           APPENDIX D
                UARS BATTERY PERFORMANCE DATA
                  Week ending 04 May 2001


     27 Apr 2001 - GMT Day 117 Beta = 31.6 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   -3.05/-4.31  +0.0/+0.0      12.0    0.000    0.0
2    +11.2/-89.6     +6.11/+4.51  +28.8/-15.2    24.2    1.030    21.6
3    +22.4/-50.4     +5.15/+3.55  +28.8/-16.0    24.2    1.020    21.6


     4 May 2001 - GMT Day 124 Beta = 60.9 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   +728.0/+728.0  -3.05/-4.62   +0.0/+0.0     11.8     0.000     0.0
2   +00.0/-33.6    +3.87/+2.60   +22.0/-15.2   26.4     1.060     16.8
3   +22.4/-22.4    +2.92/+1.66   +21.2/-15.2   26.4     1.050     16.4


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

________________________________________________________________________                                         


                           APPENDIX E
                     UARS ANOMALY REPORTS
                    Week ending 04 May 2001

                  NEW ANOMALY REPORTS GENERATED
AR NO.  SUBSYS    ORBIT     TIME     TTR    PROBLEM/DATA LOSS
------  ------    -----     ----     ---    -----------------
01-021  SOLSTICE  52696   122/0142   N/A    Det. OFF and Tubes volt. low
01-022  ACRIM     52709   122/2140   N/A    Red Low voltage alert
01-023  FOT       52728   124/0441   N/A    SSPP FDC tripped

             ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.  SUBSYS    ORBIT     TIME     TTR     PROBLEM/DATA LOSS
------  ------    -----     ----     ---     -----------------
01-023  FOT       52728   124/0441   N/A     SSPP FDC tripped.

              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
------  ------   -----     ----     ---     -----------------
01-019  FOT      see list  Apr 01   14170   Generic Late Acquisition
01-021  SOLSTICE 52696     122/0142   N/A   Det. OFF and Tubes volt. low
01-022  ACRIM    52709     122/2140   N/A   Red Low voltage alert


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