UARS Weekly Status Report

11 JUNE 1999




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                UARS WEEKLY STATUS REPORT - 11 JUN 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 gathered its normal solar, offset, and occultation data this
past week without apparent problems.

We are evaluating the recently reprocessed V20 products before their
release to the DAAC.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

HRDI continues to operate normally.

The HRDI team would like to say farewell and good luck to a longtime team
member, Al Marshall.  Al has worked on the HRDI project since 1988 and was
responsible for writing most of the production software and keeping it
running.  This was a major task and was made possible because of Al's keen
understanding of both software and scientific issues.  Al was always
willing to help team members with problems with coding, operating systems,
data availability and just about everything else associated with HRDI.  He
was responsible for realizing that HRDI could be operated on the dayside of
every orbit, which under the present conditions of limited spacecraft power
has significantly increased the amount of data that HRDI is collecting.
There are many other accomplishments that cannot be listed here because of
space.

Al has left us for a better place - retirement.  He is one of the lucky
baby boomers (yes, a boomer!) that will be able to do so while he is still
alive.  Between playing golf and fixing up his and his inlaws' houses he
should be kept busy for a while.

Al has been a major contributer to the HRDI project and his efforts are a
major reason it has been so successful.  It is an unfortunate reality that
when projects like this are successful those at the top receive accolades,
while others who "toil in the trenches" are unrecognized and forgotten.
These few words are inadequate to note Al's accomplishments and
contributions, but we hope that other members of the UARS team will give
him a nod of thanks and wish him well.

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

WINDII's next operating period is June 30 to July 9, which will
include PMC observations in the northern hemisphere. Analysis of
Version 5 processing is continuing. 

***********
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.
        13 days CLA (7.0)  PROD (L1-L3)         (48R-48C=0L)
        45 days WIN (5.11) PROD (L1-L3)         (1540R-677-4F=859L)

The CDHF notified all PI Software Representatives concerning hardware
problems that the CDHF experienced on Disk11 last Friday. We were able to 
resolve the problems prior to the weekend so production processing could
continue. 
       
The CDHF requested the CNE re-register the CDHF5 node in the GSFC nameserver.
It is unknown how the DNS lost the node info.  Any mail returned to users
stating CDHF5 is unknown, will now transfer as expected.

CDHF pending software upgrades:  DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres.

SOLSTICE Wall Clock time increase.
"Plan to monitor Ingres file catalogue activity in debug run, to 
determine where the catalogue queries are spending all of their time." 

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

This report covers 29 May 1999 (Orbit 42144 , GMT Day 149) through 04 June 
(GMT Day 155).


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      149/0122     42144     On
                WINDII     151/0124     42174     Off
                 PEM       152/2350     42203     AXIS On
                WINDII     153/1343     42212     On

The beta angle ranged between the angles of 56.5 degrees to 27.5 degrees 
for this report period.  The beta angle is now decreasing toward a minimum 
angle of 0 degrees on 11 June 1999 (DOY 162).

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 1.0 to 1.3 degrees C.  Additional battery performance data 
for each battery on 28 May 1999 and 04 June 1999 are provided in Appendix 
D.

The clock error ranged from -10.5 to 10.2 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  =   03

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

%     FOT       03
%     WINDII    02
%     HALOE     01
%     SOLSTICE  01
%     PEM       01

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

%     FOT     03

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

TRANSPONDER FREQUENCIES:
          Transponder A:  99/130  -  2287.496913
          Transponder B:  99/151  -  2287.499087


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 99/119 show the observatory data loss to be 
24 hours, 13 minutes, 03.220 seconds (an increase of 0.800 seconds since 
the last report period).  This is a 0.0359 percent data loss which equals a 
99.9641 percent data capture for the mission.



The increase of 0.800 seconds occurred over one (1) day:

7 0.800 seconds on Day 153 due to a data hit.


OTHER SIGNIFICANT EVENTS

                   UARS SATELLITE OPERATIONS

FOT personnel are supporting the IMOC (SCS-21) development effort.  The 
current work is a continuation of the SCS-21 UARS implementation effort 
done last year which culminated in a level 1 demonstration.

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

The end-to-end testing has been delayed until a new FORMATS software 
release can be made to accommodate the special Y2K planning aids.

UARS PROPULSION MODULE B/D THRUSTER LINE FILL - No change


MEETINGS

FOT attended the weekly IMOC meetings on 03 June 1999.


FUTURE SIGNIFICANT EVENTS

The next UARS Yaw Around Maneuver (forward-to-reverse) is scheduled for 11 
June 1999 (DOY 162).


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 04 June 1999

ORBIT      AOS         NO.     SUBSYS         REASON
-----      ---        ---     ------         -------  
42144   149/0122     99-191     HALOE      Power ON
42173   150/2347     99-193     SOLSTICE   Solstice Reboot
42174   151/0124     99-192     WINDII     Power OFF
42175   151/0304     99-194     OBC        Clk Adj 20.6 to 0.00 msec/day
42203   152/2350     99-195     PEM        AXIS Power ON
42212   153/1343     99-196     WINDII     Power ON
42212   153/1414     99-197     OBC        Clk Adj fr 0.00 to 20.6 msec/day
42234   155/0041     99-198     OBC        Clk Adj fr 20.6 to 0.00 msec/day

_______________________________________________________________

                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                        Week ending 04 June 1999

MNEMONIC           STATE      DESCRIPTION                ORBITS
---------          -----      ------------               ------
SOSFTEVLTG          R-LO     SOLSTICE F-TUBE VOLTAGE     42172,73  
SOSGTEVLTG          R-LO     SOLSTICE G-TUBE VOLTAGE     42172,73  
SOSNTEVLTG          R-LO     SOLSTICE N-TUBE VOLTAGE     42172,73  



The following ALERT occurrences were detected:

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


_______________________________________________________________

                              APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                        Week ending 04 June 1999

                      CLOCK DRIFT RATE ADJUSTMENTS

     ORBIT            TIME                    CLOCK RATE CHANGE
     -----            ----                    -----------------
     42175     151/03:10 (30 May 99)      from 20.6 to 00.0 msec/day
     42212     153/14:29 (02 June 99)     from 00.0 to 20.6 msec/day
     42234     155/00:46 (03 June 99)     from 20.6 to 00.0 msec/day



                              APPENDIX D
                    UARS BATTERY PERFORMANCE DATA
                        Week ending 04 June 1999


     28 May 1999 - GMT Day 148 Beta = 56.5 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  -89.6/-112.0  -3.68/-4.94   +0.0/ +0.0    16.5    0.000    0.0
2  +22.4/-11.2   +5.15/+3.87  +25.6/-16.0    24.8    1.022   21.0
3  +33.6/-22.4   +4.51/+2.60  +24.8/-16.0    24.8    1.026   20.6


     04 June 1999 - GMT Day 155 Beta = 27.5 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  -89.6/-112.0  -3.05/-4.31   +0.0/ +0.0   16.5     0.000    0.0
2  +22.4/-33.6   +6.76/+5.15  +31.2/-15.2   24.0     1.022   22.5
3  +33.6/-33.6   +5.47/+4.19  +30.4/-16.4   23.8     1.022   22.3


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



                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 04 June 1999


                      NEW ANOMALY REPORTS GENERATED
  AR NO.   SUBSYS   ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------   -----      ----       ---      -----------------
99-028     FOT     42155    149/1823     14170     Generic Late Acquisition
99-023     FOT     42179    151/0816     14170     Generic Late Acquisition
99-028     FOT     42244    155/1702     14170     Generic Late Acquisition

                ANOMALY CLOSURE INFORMATION RECEIVED
  AR NO.   SUBSYS    ORBIT      TIME       TTR      PROBLEM/DATA LOSS
  ------   ------    -----      ----       ---      -----------------
99-027     FOT     42100     146/0249     20905     I channel dropout/no
99-023     FOT     see list    May 99     14170     Generic Late Acq

             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
  ------   ------    -----      ----       ---      -----------------
99-028     FOT     see list     June 99   14170     Generic Late Acq

	 	SEVNTFW99/23