UARS Weekly Status Report

30 June 2000




********************************************************************

                UARS WEEKLY STATUS REPORT - 30 JUN 2000

********************************************************************

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

We continue to gather enough data to meet all the SOLSTICE science
objectives during this period of reduced tape recorder operations. 
SOLSTICE operates normally, collecting solar data on all available 
orbital tracking periods and stellar calibration observations whenever 
possible. 

We have planned a special observation of Mercury for execution on Friday
(June 30). Additional observations will be made later in the year when
more observation time is available. Thanks to Rich Beck for his help.

Level 2 processing is halted due to bugs in the OA_SSPP_ATT and
OA_SAT_ATT services related to data gaps. CDHF and CSC personnel have
released engineering patches to these routines and we are beginning to
incorporate them into a test release of our production software.

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

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

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinated with the Flight
Operations Team and to assist the Project Scientist in 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.
    -  All requested reprocessing is complete as of this reporting period
                         
 CDHF REHOST:
   -  Successful processing on Rehost System:
       Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, HRDI,
       MLS, SUSIM, Solstice, and WINDII.
   -  Waiting validation results from the HRDI group on successful
      production testing done on the Rehost System.
   -  System test is progress.                     
                  
***********
FOT
***********
       
                             REPORTING PERIOD

This report covers 17 June 2000 (Orbit 47912, GMT Day 169) through 23 June 2000 
(Orbit 48017, GMT Day 175).

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
      WINDII          170/0139        47928        Power ON
      WINDII          170/0721        47932        Power OFF
      WINDII          170/2023        47939        Power ON
      WINDII          171/0324        47944        Power OFF

The beta angle ranged between the angles of 31.0 degrees to 31.3 degrees for 
this report period.  The beta angle is now decreasing toward a minimum angle of 
2.0 degrees on 04 July 2000 (DOY 186).

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  16 June 2000 and 23 June 2000 are provided in Appendix D.

The clock error ranged from -11.3 to 11.1 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  =  03
%     ALERTS         =  00 

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

%     FOT            =  23
%     WINDII         =  04
%     HALOE          =  02

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

%     FOT            =  01

Four (4) Anomaly Reports remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
- Transponder A:  00/145  -  2287.497008
- Transponder B:  00/152  -  2287.498920


                           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 00/174 show the observatory data loss to be 296 hours, 20 
minutes, 7.713 seconds (an increase of 0 minutes 0.0 seconds since the last 
report period).  This is a 0.40 percent data loss which equals a 99.60 percent 
data capture for the mission.





                           OTHER SIGNIFICANT EVENTS

                            UARS SATELLITE OPERATIONS

The FOT will finally continue testing the new TMONs again next week.  The 
coding changes lost in the UTTS disk crash have been reinserted and the 
scenario lost is in the process of being rebuilt.  Once the TMONs have been 
thoroughly tested, they will be presented for review and approval before 
uplink.

The FOT has begun writing the online procedure for safehold should it happen 
before the new TMONs are in place or during and OBC halt.  This procedure will 
be tested on the simulator and put online for immediate execution should an 
anomalous condition take place.


                                  MEETINGS

The FOT held a teleconference with Dave Lorenz and the FSW group to discuss the 
Multi-TDRS patch.  Many options were discussed and the FOT and FSW group 
continue to look into the best method for implementing this patch.  A decision 
for 3 or 4 TDRS will be given at the next FSW CCB.

The FOT attended a meeting to review the TMON trip on day 159.  Lessons learned 
and future best practices were discussed to avoid this problem in the future.


                          FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for July 04, 2000 (DOY 186).  This maneuver 
will be a Reverse to Forward Flight maneuver (Southern 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 23 June 2000

  ORBIT          AOS          NO.          SUBSYS         REASON
  -----          ---          ---          ------         -------
  47914          169/0320     00-278       NBTR       PLAYBACK
  47914          169/0356     00-278       NBTR       NOOPS D-169
  47923          169/1742     00-279       NBTR       NOOPS D-170
  47928          170/0139     00-280       WINDII     Power ON
  47930          170/0502     00-279       NBTR       NOOPS D-170
  47930          170/0540     00-279       NBTR       PLAYBACK
  47932          170/0721     00-281       WINDII     Power OFF - S/C LOW POWER
  47938          170/1744     00-282       NBTR       NOOPS D-171
  47939          170/2023     00-280       WINDII     Power ON
  47944          171/0324     00-281       WINDII     Power OFF - S/C LOW PWR
  47944          171/0324     00-282       NBTR       PLAYBACK
  47945          171/0504     00-282       NBTR       NOOPS D-171
  47953          171/1747     00-283       NBTR       NOOPS D-172
  47959          172/0326     00-283       NBTR       PLAYBACK
  47960          172/0506     00-283       NBTR       NOOPS D-172
  47968          172/1847     00-284       NBTR       NOOPS D-173
  47969          172/1929     00-285       OBC     Clk Adj 0.00 to 20.6 msec/day
  47974          173/0328     00-284       NBTR       PLAYBACK
  47975          173/0508     00-284       NBTR       NOOPS D-173
  47982          173/1609     00-284       NBTR       NOOPS D-174
  47989          174/0329     00-286       NBTR       PLAYBACK
  47990          174/0509     00-287       OBC     Clk Adj 20.6 to 0.00 msec/day
  47990          174/0549     00-286       NBTR       NOOPS D-174
  47995          174/12:43    00-289       HALOE      FOV test
  47995          174/1347     00-290       HALOE      Reset FOV
  47998          174/1758     00-288       NBTR       NOOPS D-175
  48004          175/0331     00-288       NBTR       PLAYBACK
  48006          175/0648     00-288       NBTR       NBTR NOOPS D-175
  48013          175/1953     00-292       NBTR       NBTR NOOPS D-176
_______________________________________________________________________________

                                      APPENDIX B
                          OUT-OF-LIMITS & ALERTS OCCURRENCES
                              Week ending 23 June 2000

The following Out-Of-Limits occurrences were detected:

  MNEMONIC          STATE         DESCRIPTION           ORBITS
  ---------         -----         ------------           ------
  HRPSEQBIMON       Y-HI          PSE QB Current Mon     47914-17
  HRPTSPBIMON       R-LO          PTS PB Current Mon     47916-7
  HRPSEQBIMON       Y-HI          PSE QB Current Mon     47930

The following ALERT occurrences were detected:

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



                                      APPENDIX C
                         CLOCK & SOLAR ARRAY RATE CORRECTIONS
                               Week ending 23 June 2000

                            CLOCK DRIFT RATE ADJUSTMENTS

  ORBIT          TIME                          CLOCK RATE CHANGE
  -----          ----                          -----------------
  47969        172/19:29 (20 June 00)          from 0.00 to 20.6 msec/day
  47990        174/05:09 (22 June 00)          from 20.6 to 0.00 msec/day

_______________________________________________________________________________

                                      APPENDIX D
                             UARS BATTERY PERFORMANCE DATA
                               Week ending 23 June 2000


          16 June 2000 - GMT Day 168 Beta = 31.0 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     +39.2/+11.2    -2.42/-3.68  +0.0/+0.0       15.7     0.000       0.0
2     +28.0/-28.0    +7.09/+5.15  +28.8/-15.2     23.8     1.030       23.0
3     +22.4/-78.4    +5.47/+4.19  +28.4/-15.2     23.7     1.028       22.0


          23 June 2000 - GMT Day 175 Beta = 31.3 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    +39.2/+11.2     -3.05/-4.31  +0.0/+0.0      15.7       0.000       0.0
2    +16.8/-56.0     +5.47/+4.51  +28.8/-14.4    25.1       1.040       20.7
3    +22.4/-28.0     +4.51/+3.23  +28.0/-14.4    25.1       1.037       20.5


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

                                      APPENDIX E
                                 UARS ANOMALY REPORTS
                               Week ending 23 June 2000

                            NEW ANOMALY REPORTS GENERATED
 AR NO.        SUBSYS      ORBIT       TIME        TTR      PROBLEM/DATA LOSS
 ------        ------      -----       ----        ---      -----------------
 00-027        FOT         47928      170/0215     22524    Late Acq./Data Loss

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

                          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
 ------       ------        -----       ----          ---   -----------------
99-064        FOT           44135       10/8-9/99     N/A   HRDI Cal Lamp Errors
99-071        FOT           44398       299/1212     21512  TPF Not Receiv 512
00-026        FOT           see list    June 00      14170  Generic Late Acq.
00-027        FOT           47928       170/0215     22524  Late Acq./Data Loss

	 	SEVNTFW00/25