UARS Weekly Status Report

19 FEBRUARY 1999




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                UARS WEEKLY STATUS REPORT - 19 FEB 1999

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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 successfully gathered its normal solar, offset, and occultation
data after Feb. 12 when it was powered on again without apparent
problems.

Reprocessing of the SUSIM data to data version 20 continues.

After several weeks of work and the generation of a new set of level 0
test files, SUSIM production software has passed all of the tests
for Y2K compliance.  Our thanks go to Ed Esfandiari of the SUSIM group
as well as John Rizzello and N. Downs of the CDHF for their efforts. 

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

     PEM is active PMON control.  Energy processor #6 for the HEPS-1 unit
has been found to not activate correctly.  Data affected are from the upper 
energy EE channel for Head-2 of HEPS-1 (that is the +15 deg electrons above
300 keV).  Tests are being conducted on this energy processor to assure
that it is operating correctly.  Measurements from this sensor will be
activated as soon as possible.  The PEM team and FOT are currently examing 
the PMON activation sequence to determine if there is interference during
the commanding of this energy processor.

     While under PMON control, the PEM instrument computes energy deposition
from the HEPS unit.

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

Nothing received.

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

The instrument is now off as scheduled. MLS is scheduled to begin south viewing
operations on Feb 27 and operate though Mar 4. 

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

Nothing received.

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

WINDII is currently off, and scheduled for operation March
5 to March 16. Work on the activation of the new production
software is under way. 

***********
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 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.
           0 days HAL (4.80) PROD (L3)        (1874R-1721C-1F=152L)
          34 days PEM (3.32) PROD (OA-L2)     (760R-84C=626L)
           2 days WIN (5.11) ENG  (L1-L3)     (2R-2C=0L)
           1 day  SOL (4.62) PROD             (1R-1C=0L)
   
The CDHF will load December 1998 current day DAAC data in February 1999.
                    
CDHF pending software upgrades:  DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres.
                  
***********
FOT
***********

This report covers 05 February 1999 (Orbit 40467, GMT Day 037) through 12 
February 1999.
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
               ACRIM      038/2344     40496     Off
               PEM        038/2344     40496     Off
               SUSIM      038/2344     40496     Off
               WINDII     038/2344     40496     Off
               SOLSTICE   039/0130     40497     On-PMON
               HALOE      039/1142     40503     On
               MLS        042/2244     40555     Off
               ACRIM      042/2357     40556     On
               SOLSTICE   043/0007     40556     On-Full
               HRDI       043/0007     40556     On-Full
               SUSIM      043/1339     40564     On

The beta angle ranged between the angles of 65.1 degrees to 34.1 degrees 
for this report period.  The beta angle is now decreasing toward a minimum 
angle of -2 degrees for the next yaw on 20 February 1999 (DOY 051).

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 1.1 degrees C.  Additional battery performance data 
for each battery on 05 February 1999 and 12 February 1999 are provided in 
Appendix D.

The clock error ranged from -13.5 to 11.4 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         =   00
%     OUT-OF-LIMITS  =   17

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

%     FOT     04
%     ACRIM   02
%     SUSIM   02
%     HALOE   01
%     MLS     01
%     WINDII  01
%     PEM     01

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

%     FOT     01

One (1) Anomaly Report remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
          Transponder A:  99/019  -  2287.496951
          Transponder B:  99/020  -  2287.499045


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 99/035 show the observatory data loss to be 
21 hours, 50 minutes, 51.540 seconds.  This is a 0.0338 percent data loss 
which equals a 99.9662 percent data capture for the mission.

There were no data loss calculations reported for this report period due to 
a power outage in Building 23.  The outage lasted from approximately 
042/1200 to 043/2240.

The FOT received a partial set of test 8-week planning aids last week. The 
files start in 1999 and cross into year 2000.  These planning aids were 
processed by the FOT this week.  The FOT are still waiting for the 
remainder of these test products from FDF.

The UARS Test and Training Simulator (UTTS) remains non-operational.  The 
estimated time to repair the UTTS and return it to operation is unknown.


OTHER SIGNIFICANT EVENTS

UARS SATELLITE OPERATIONS

The FOT continues to support the PEM team with diagnosis of the Energy 
Processor 6 status error.

The FOT continues to investigate the feasibility of a new PMON action to 
change battery V/T curves based on loading to mitigate battery risks in sun 
pointing safehold.


YEAR 2000 OPERABILITY SUPPORT - No change


UARS PROPULSION MODULE B/D THRUSTER LINE FILL

Planning continues for the simulator testing.


UARS RE-ENGINEERING - TELEMETRY PROCESSING - No change



MEETINGS

None.


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver is scheduled for 20 February 1999.

The next annular solar eclipse will occur on 16 February 1999 over the 
Indian Ocean, Australia and the South Pacific Ocean.


PERSONNEL CHANGES

None


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 12 February 1999

ORBIT     AOS           NO.     SUBSYS         REASON
-----     ---          ---     ------         -------  
40476    037/1512     99-054     OBC      Clk Adj fr 41.2 to 20.6 msec/day
40483    038/0303     99-055     OBC      Clk Adj fr 20.6 to 0.00 msec/day
40496    038/2344     99-056     ACRIM    Power OFF
40496    038/2344     99-057     PEM      AXIS OFF
40496    038/2344     99-058     SUSIM    Power OFF
40496    038/2344     99-059     WINDII   Power OFF
40503    039/1142     99-060     HALOE    Power ON
40505    039/1416     99-061     OBC      Clk Adj fr 0.00 to 20.6 msec/day
40541    041/2355     99-062     OBC      Clk Adj fr 20.6 to 0.00 msec/day
40555    042/2244     99-063     MLS      Power OFF
40556    042/2357     99-064     ACRIM    Power ON
40564    043/1339     99-065     SUSIM     Power ON

_______________________________________________________________

                               APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 12 February 1999

MNEMONIC       STATE      DESCRIPTION                     ORBITS
---------      -----      ------------                    ------
WIQBCURRENT     Y-LO    WINDII Quiet Bus Current     Continuous
SOSDTCTTMPR     Y-LO    Detectors Temperature        40509-15,22-25
SORLGCTMPR      Y-LO    Logic Temperature            40509,10,12-14,22-25
SOSTMPRBLFT     Y-LO    Temperature Bot_Left_Front   40514,23
QTSSPPMX        Y-HI    SSPP -X Thermostat           40520,23,33,34,48,52,53
ACTEMPANA1      Y-LO    Temp PCU Board               40556-62
ACTEMPANA2      Y-LO    Temp Sensor Electronics      40556-62
ACTEMPSA1       Y-LO    Temp ACR 1                   40556-62
ACTEMPSA2       Y-LO    Temp ACR 2                   40556-62
ACTEMPSA3       Y-LO    Temp ACR 3                   40556-62
SORLBXTMPR      Y-LO    Logic_Box Temperature        40556-62
SOSTMPRTRFT     Y-LO    Temperature Top_Rt_Front     40556-62
SOSTMPRTRBK     Y-LO    Temperature Top_Rt_Back      40556-62
SOSTMPRTLMD     Y-LO    Temperature Top_Left_Mid     40556-62  
SOSTMPRTLBK     Y-LO    Temperature Top_Left_Back    40556-62  
SOSDTCTTMPR     Y-LO    Detectors Temperature        40556-62  
SOSTMPRBLMD     Y-LO    Temperature Bot_Left_Mid     40556-62  


The following ALERT occurrences were detected:

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

_______________________________________________________________

                              APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                       Week ending 12 February 1999

                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT              TIME                 CLOCK RATE CHANGE
     -----              ----                 -----------------
     40476     037/15:15 (06 Feb 99)     from 41.2 to 20.6 msec/day
     40483     038/03:08 (06 Feb 99)     from 20.6 to 0.00 msec/day
     40505     039/14:20 (08 Feb 99)     from 0.00 to 20.6 msec/day
     40541     041/23:58 (10 Feb 99)     from 20.6 to 0.00 msec/day

_______________________________________________________________


                             APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                       Week ending 12 February 1999


     05 Feb 1999 - GMT Day 036 Beta = 65.1 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   +11.2/-5.6   -3.68/-4.94   +0.0/ +0.0    16.8    0.000    0.0
2   +22.4/-11.2  +3.87/+2.92  +22.8/-16.0    26.4    1.027   18.9
3   +56.0/-11.2  +2.92/+1.97  +22.4/-15.2    26.2    1.030   18.5


     12 Feb 1999 - GMT Day 043 Beta = 34.1 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      0.0/-11.2  -3.05/-4.31   +0.0/ +0.0   16.8    0.000    0.0
2    +56.0/ 0.0   +5.47/+4.51  +30.4/-14.4   26.2    1.030   21.1
3    +56.0/-11.2  +4.51/+3.55  +29.6/-14.4   26.1    1.027   20.8


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



                               APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 12 February 1999


                     NEW ANOMALY REPORTS GENERATED
  AR NO.   SUBSYS       ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------       -----      ----       ---      -----------------
99-006     FOT          40469     037/0439    14170     Generic Late Acq


                  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


                        OPEN ANOMALY REPORTS
  AR NO.   SUBSYS      ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------      -----      ----       ---      -----------------
99-006      FOT     see list     Feb 99     14170     Generic Late Acq



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