UARS Weekly Status Report

20 March 1998





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                UARS WEEKLY STATUS REPORT - 20 March 1998

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

SOLSTICE continues to operate normally, collecting solar data on all 
available orbital tracking periods and stellar calibration observations, 
whenever possible.

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

SUSIM resumed operations on March 17.  Some communication problems
were encountered in the KCRT/MSOCC system during the turn on.
Since then, SUSIM successfully gathered its normal solar,
offset, and occultation scan data without apparent problems.

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

     PEM is currently off.

     PEM is awaiting evaluation by GSFC of its proposed activation procedure.
The minimal configuration for PEM AUX activation is the zenith VMAG, MEPS1, 
MEPS2, and HEPS1 units, only.  This configuration is driven by the capabilities 
of the spacecraft OBC and may increase if OBC program area increases.  PEM 
activation is proposed to be OBC driven when there exists plenty of power to 
operate PEM.  It is anticipated that the OBC will activate PEM on the daylight 
portions of every orbit.

     PEM supported the UARS Science team meeting this March 16.  The PEM PI, 
J. D. Winningham, gave a status update on PEM.  PEM gave two Oral presentations
on Monday, March 16: "The UARS PEM Energetic Particle Climatology - Status and 
Applications," (J. R. Sharber, R. A. Frahm, G. Crowley, A. J. Ridley, R. Link, 
J. D. Winningham, E. E. Gaines, R. W. Nightingale, D. L. Chenette, and 
W. R. Keith) and "Particle Effects on the Middle Atmosphere Modeled using the 
Parallelized TIME-GCM," (G. Crowley, A. J. Ridley, J. D. Winningham, R. Link, 
R. A. Frahm, J. R. Sharber, R. G. Roble, A. Richmond, and J. M. Russell III); 
and a poster on Tuesday, March 17: "A Global PEM Electron Precipitation 
Climatology for the Kp Index: Work in Progress," (R. A. Frahm, G. Crowley, 
J. R. Sharber, J. D. Winningham, R. Link, A. J. Ridley, E. E. Gaines, 
D. L. Chenette, B. J. Anderson and T. A. Potemra).  All these PEM presentations
dealt with creating a PEM particle based climatology.

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

Nothing received.

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

The MLS instrument has been powered off since Mar 16. MLS is scheduled to
resume south viewing operations on Mar 26.

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

HRDI is on and operating normally.

The HRDI rack node SPRLJ is down.  Mail may be sent to HRDID instead of SPRLJ.

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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.

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

The CDHF worked with MPG, CMS and RAC Instrumentors to facilitate 
communications directly with MPG and CMS in Building 32, without routing
through Building 23. Routers in B-23 were temporarily shut down Tuesday as a 
test to ensure that PI's could reach MPG and CMS without the use of CDHF
routers. This activity is being done in the near term for the B-23 power
outage scheduled March 20-23.
     
The CDHF has received a total of 379 CD-ROM requests as of 20-March-1998.
There were two orders received and shipped.
          
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.           
                  25 days PEM (3.32) PROD (1379R-1029C=350L)
                 122 days MLS (4.90) PROD (1297R-1055C=226L)
                   4 days CLAES (7.0) ENG (38R-23C=15L)
                   2 days HAL (4.80) ENG  (4R-2C=2L)              
  
Pending software upgrades: IDL 5.0, OpenIngres, UCSS. 

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FOT
***********

REPORTING PERIOD

This report covers 06 March 1998 (Orbit 35435, GMT Day 066) through 13 
March 1998 (Orbit 35539, GMT Day 072).


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
     SUSIM     070/2131     35508     Off
     ACRIM     070/2311     35509     Off
     HRDI      070/2311     35509     Off
     MLS       070/2311     35509     On
    WINDII     072/0255     35527     On
    HALOE      072/1958     35537     Off
    HALOE      072/2319     35539     On

The beta angle is now increasing toward a maximum angle of 54.5 degrees on 
15 March 1998 (DOY 074).

Relative Time Sequence (RTS) number 12 , RTS-12, was generated and uplinked 
to support cycling of compensation heater 18 (CH18) during the period of 
time when SUSIM is powered off.  The RTS was uplinked on 11 March 1998 
during the 070/21:31 event - the same event in which SUSIM was powered off.  
Through PMON initiated commanding, the RTS will enable both the A and B 
sides of compensation heater 18, in an effort to keep the SUSIM instrument 
warm during the power OFF phase.  The original version of RTS-12 (which 
enables only the A side of CH18) will be uplinked again when SUSIM is 
powered again, on 17 March 1998 (GMT Day 076).

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 25.0 V end-of-night (EON) load bus voltage.  
Battery temperatures are stable with a temperature delta between Battery 2 
and Battery 3 of 1.1 degrees C.  Additional battery performance data for 
each battery on 07 March 1998 and 13 March 1998 are provided in Appendix D.

The clock error ranged from -10.4 to +12.3 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.

%     ALERTS         =     none
%     OUT-OF-LIMITS  =     05

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

%     FOT     03
%     ACRIM   01
%     HALOE   02
%     HALOE   02
%     HRDI    02
%     MLS     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.


TRANSPONDER FREQUENCIES:
     Transponder A:  98/041  -  2287.497104
     Transponder B:  98/042  -  2287.499330


GROUND SYSTEM OPERATION

No (0) operational support problem(s) 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 98/071 show the observatory data loss to be 
20 hours, 42 minutes, 8.084 seconds (an increase of 0.544 seconds).  This 
is a 0.0365 percent data loss which equals a 99.9635 percent data capture 
for the mission.

The increase of 0.544 seconds occurred on Day 067 and was due to a hit in 
the data.

FOT continues to investigate the methodology of participating in the IP 
Forward Link testing.  The IP Forward Link testing can be completed by 
immediately sending NOOP commands to the actual spacecraft (as most 
projects have done), or to try to test the IP forward link configuration 
with the UARS simulator.  The latter option would involve having command 
sent from the AP, through NASCOM, out to White Sands, back to NASCOM, and 
to the simulator.  At present, the FOT is unsure whether or not this 
testing configuration can be accomplished.

The FOT is still unable to receive good Q-channel OBC dump data.  The MSOCC 
System Engineer has investigated the problem, and feels that the Q-channel 
data being received at MSOCC is corrupted, and it is not the MSOCC resident 
conversion devices which are corrupting the Q-channel data.  Further 
testing will be conducted next week.

The inability to transmit commands to the UARS Test and Training Simulator 
(UTTS) was first observed on 24 February 1998.  This problem cleared on 11 
March 1998. The cause of the command link problem between MSOCC and the 
UTTS was finally determined to be a bad NASCOM line connection.  

Testing of the latest AP software (modified to support a reduced ATC load) 
was successfully completed.  Following the UTTS command link repair, the 
ATC load and dump capabilities were tested, and all tests functioned 
correctly.  Once this version of the AP software is released, the ground 
system will be ready to support the new PMON flight software.

Operational processing of level-0 telemetry analysis files continues in 
parallel on both the UMPGAL (new MPG Alpha machine) and CDHF computer 
systems.  No level-0 file transfer failures (between CDHF and UMPGAL) 
occurred this week.


OTHER SIGNIFICANT EVENTS

Work on the upgrade of the OBC Power Monitor (PMON) software continued.

FOT is supporting CNMOS in their efforts to make necessary software changes 
(MSOCC, CMS, DCF, etc.) to support the year 2000 rollover.

UARS Memo No. 98-004, dated 09 March 1998, was issued to documents the 25 
February 1998 FOT/FDF predicted attitude meeting where a decision to 
execute an orbit adjust was made by the NASA Project Manager and NASA 
Flight Operation Director.

UARS Memo No.98-005, dated 12 March 1998, was issued to define the planning 
schedule for execution of the UARS orbit adjust in August 1998.

Monitoring of the magnetic field model performance continues.

FOT continues to improve a Power Profile for UARS based on the current 
status of the Modular Power System.

FOT continues to support the new UARS ground system re-engineering effort.


MEETINGS

No UARS Battery telecon was held this week.  The next telecon has not been 
scheduled.

FOT attended a meeting with the CNMOS UARS Project Manager (John Grassel) 
on 06 March 1998 to discuss Year 2000 testing requirements for the AP and 
the CMS.  Several actions items were assigned, with the FOT having the 
responsibility of formally requesting Year 2000 planning aids from FDF.  
Once the planning aids are received from FDF, CMS testing can be conducted.  
This meeting was a prelude to the group meeting held on 09 March 1998.

FOT met with E.Z. Block on 10 March 1998 to discuss details involved with 
the Year 2000 testing of the CMS system.


FUTURE SIGNIFICANT EVENTS

All building 23 power will be down during the weekend of 20-23 March 1998 
to perform work on the building power supply.  The building 23 systems will 
be unavailable from about 12 pm on Friday, 20 March 1998, until about 12 pm 
on 23 March 1998.

The next UARS Yaw Around Maneuver is currently scheduled for 02 April 1998.

A second building 23 power outage is scheduled from about 12 pm, 24 April 
1998, until about 12 pm, 27 April 1998.

UARS Flight Operations plans to attend the Program Experience portion of 
the Space Power Workshop at JPL in April 1998.  UARS FOT plans on 
presenting an overview of the UARS batteries and their performance.

The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust 
is targeted for 05 August 1998.


PERSONNEL CHANGES

New employee, Peter Thomas, reported for work on 09 March 1998 as an off-
line engineer.


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 13 March 1998

ORBIT      AOS       NO.     SUBSYS               REASON
-----      ---       ---     ------              -------  
35435     066/0034  98-085    HRDI    Power ON
35450     067/0037  98-086    OBC     Clk Adj fr 0.00 to 20.6 msec/day 
35494     069/2308  98-087    OBC     Clk Adj fr 20.6 to 0.00 msec/day
35508     070/2131  98-088    SUSIM   Power OFF
35508     070/2131  98-090    SUSIM   RTS 12 for SUSIM
35509     070/2311  98-090    ACRIM   Power OFF
35509     070/2311  98-091    HRDI    Low Power Mode
35511     071/0209  98-092    MLS     Power ON
35516     071/0944  98-093    OBC     Clk Adj fr 0.00 to 20.6 msec/day
35527     072/0255  98-094    WINDII  Power ON
35537     072/1958  98-095    HALOE   Power OFF
35539     072/2319  98-096    HALOE   Power ON


_______________________________________________________________

                               APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 13 March 1998

MNEMONIC     STATE      DESCRIPTION                       ORBITS
---------    -----      ------------                      ------
HRPTSPBIMON   Y-HI    Tele Pulse Bus Current Monitor   35437     
HRIFESURVTMP  Y-HI    HRDI IFE Survival Temp           35511
QTSISAIF      Y-HI    SSPP Baseplate by SISA I/F       35516,26-39
SORLBXTMPR    Y-LO    Logic_Box Temperature            35526-39
HATBAT        Y-HI    Bolometer Area Temp              35535-6

The following ALERT occurrences were detected:

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



                               APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                      Week ending 13 March 1998

                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT              TIME                 CLOCK RATE CHANGE
     -----              ----                 -----------------
     35338     059/12:13 (28 Feb 98)     from 20.6 to 00.0 msec/day
     35398     063/12:44 (04 Mar 98)     from 00.0 to 20.6 msec/day
     35425     065/07:50 (06 Mar 98)     from 20.6 to 00.0 msec/day


_______________________________________________________________

                               APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                      Week ending 13 March 1998

     07 Mar 1998 - GMT Day 066 Beta = 39.9 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/-4.31   +0.0/ +0.0   18.6    0.000     0.0
2   +67.2/  -5.6    +5.79/+4.51  +29.6/-15.2   25.6    1.026    21.9
3   +56.0/ -16.8    +4.51/+3.23  +28.8/-15.2   25.6    1.027    21.1

     13 Mar 1998 - GMT Day 072 Beta = 53.8 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   18.4    0.000    0.0
2   +56.0/ -11.2    +6.44/+4.19  +26.8/-16.8   25.0    1.023   22.1
3   +84.0/ -11.2    +5.15/+2.92  +25.6/-16.8   25.0    1.024   21.6


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



                               APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 13 March 1998

  AR NO.   SUBSYS     ORBIT     TIME       TTR      PROBLEM/DATA LOSS
  ------   ------     -----     ----       ---      -----------------
98-011     FOT      35533    072/1314     N/A     TAC Crashed


               ANOMALY CLOSURE INFORMATION RECEIVED
  AR NO.  SUBSYS      ORBIT     TIME       TTR      PROBLEM/DATA LOSS
  ------  ------      -----     ----       ---      -----------------
          None this report period


               ANOMALY INVESTIGATION REPORTS GENERATED
  AIR NO.  SUBSYS     ORBIT     TIME       TTR      PROBLEM/DATA LOSS
  -------  ------     -----     ----       ---      -----------------

          None this report period