UARS Weekly Status Report

18 June 2004




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                UARS WEEKLY STATUS REPORT - 18 June 2004

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

SOLSTICE continues to perform nominally, taking solar data on all 
available orbital tracking periods.

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

During this past week, SUSIM successfully gathered its daily mid
(1.1 nm) resolution, MgII, occultation, solar pointing offset, and
continuous monitoring scans for periods of UARS real-time telemetry
or onboard tape recording.

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

     Level 2 PEM HEPSA data files are being reprocessed for submission to the 
DAAC.  This data has been designated as version 2; however, there is no format
difference from the version 1 data format.  Version 2 HEPSA data is being 
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files.  Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files.  Currently, HEPSA data between 1991274 and 2003365 has been 
reprocessed and archived at the GSFC DAAC.  

     Level 2 PEM MEPS data file documentation is complete and submitted to 
the DAAC.  MEPS data files are version 1.  Processed MEPS data files at the 
DAAC archive are between 1991274 and 2000079. MEPS data files between
2000080 and 2000309 are waiting for DAAC collection.

     PEM continues to receive NMC data files from NOAA.  No problems have
been encountered.  NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.

     The PEM data from the GUVI conjunction periods may be found at 
http://wwwpem.space.swri.edu/guvi-pem.html.  The additional electron data for 
the October and November storms of 2003 has been moved and is now located at 
http://climatology.space.swri.edu/uars_fromRudy.html.  For those users of 
SDDAS, update your UARS Meta data and these data times will appear
with full functionality.  Proton data from these storms are now located at
http://climatology.space.swri.edu/UARS_images_from_Rudy_(Apr._2004).html

*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.

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

Nothing received.

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

Nothing received.

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

The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.

Daily processing of instrument Daily Activity Plans continues
with no problems.

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

Nothing received.
                  
***********
FOT
***********

                           REPORTING PERIOD

This report covers 05 June 2004 (Orbit 69676, GMT Day 157) through  11
June 2004 (Orbit 69780, GMT Day 163).


                         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
       SOLSTICE      161/1231      69744     FULLTIME OPS
       SUSIM         161/1452      69745     POWER ON
       HALOE         163/1446      69775     POWER ON


A Reverse-to-Forward Yaw Around maneuver (number 130) was successfully
executed in Orbit 69700 beginning 158/ 15:06:29Z and completing at
158/ 15:43:39Z on 06 June 2004.  All instruments were in their off or
standby mode (except for SOLSTICE in day-only).  Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 55.71 minutes.  Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.62 and 20.04 percent
respectively.  The next (forward-to-reverse) YAW is scheduled for 
17 July 2004 (DOY 199).

The beta angle ranged between the angles of 05.5 degrees to 17.9
degrees for this report period.  The beta angle is now increasing
towards a maximum angle of 80 degrees on 27 June 2004 (DOY 180).

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 23.6 V end-of-night (EON) load bus
voltage.  Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.91 to 1.92 degrees C.  Additional
battery performance data for each battery on 04 June and 11 June 2004
are provided in Appendix D.

The clock error ranged from 11.1 to -10.3 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.

    OUT-OF-LIMITS  =    00
    ALERTS         =    00

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

    FOT       =    03
    SOLSTICE  =    01
    SUSIM     =    01
    HALOE     =    02


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).


                        GROUND SYSTEM OPERATION

One (1) operational support problem occurred this period.  Anomaly
Reports are included in Appendix E.

The data loss calculations are no longer being supplied by Data
Capture Facility (DCF).


                       OTHER SIGNIFICANT EVENTS


                       UARS SATELLITE OPERATIONS


The FOT attempted to recreate the yaw wheel anomaly on the simulator
this week.  Unfortunately, there were some problems getting the UTTS
scenario to work properly, so this work will continue next week.

A few days before the previous yaw maneuver high differential values
were seen on Battery 2, but no indication of that has been seen prior
to the yaw maneuver.  The FOT will keep a close eye on the
differential voltage after the yaw.



                               MEETINGS


The FOT attended the UARS monthly DRB meeting on 08 June 2004 to
discuss the new Eclipse software delivery scheduled for next week.

The FOT also attended the biweekly meeting with the HRDI team to
discuss the analysis of the pointing issue.  The analysis seems to
lean towards a possible timing error.  More investigation will be done
into the FSW to determine if this is indeed the case.



                                   
                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 17 July 2004 (DOY 199).  This
maneuver will be a Forward to Reverse Flight maneuver (Northern
Hemisphere viewing).



Attachments:   Appendix A,      Real-time Command 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 11 June 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
69685   157/1514   04-161   MPS         VT L6 (YAW)
69700   158/1435   04-161   MACS        YAW START
69701   158/1559   04-161   MACS        YAW COMPLETE
69701   158/1641   04-162   OBC/CLK     CLK ADJ FR 0.0 TO -20.6  MSEC/DAY
69723   160/0256   04-163   OBC/CLK     CLK ADJ FR -20.6 TO 0.0  MSEC/DAY
69731   160/1634   04-161   MPS         VT L5 (YAW)
69732   160/1733   04-161   MPS         BATSOC (YAW)
69744   161/1231   04-164   SOLSTICE    FULLTIME OPS
69745   161/1452   04-165   SUSIM       POWER ON PART 1
69746   161/1549   04-165   SUSIM       POWER ON PART 1 (CONT.)
69759   162/1324   04-165   SUSIM       POWER ON COMPLETE
69775   163/1446   04-166   HALOE       POWER ON PART 1
69778   163/1942   04-168   HALOE       POWER ON COMPLETE


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 11 June 2004

The following Out-Of-Limits occurrences were detected:

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


The following ALERT occurrences were detected:

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



                              APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                       Week ending 11 June 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
69701          158/1651               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
69723          160/0256               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 11 June 2004


     04 June 2004 - GMT Day 156 Beta = 08.7 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    -700.0/-700.0 -3.36/-4.94  +00.0/+00.0  07.0     0.00      0.0
2     +22.4/-33.6  +4.51/+3.87  +27.2/-12.8  25.4     1.01     19.9
3     +22.4/-33.6  +3.55/+2.60  +26.4/-12.8  25.4     1.00     19.5

     11 June 2004 - GMT Day 163 Beta = 17.9 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    -700.0/-700.0 -3.68/-4.94  +00.0/+00.0  07.0     0.00      0.0
2     +11.2/-089.6 +5.47/+3.55  +28.0/-14.8  24.5     1.03     19.5
3     +00.0/-123.2 +4.51/+2.60  +26.8/-14.4  24.5     1.02     18.5


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
69685          157/1514   LV5 -> LV6
69731          160/1634   LV6 -> LV5


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 11 June 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-032    FOT       69775     163/1403  30832     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-031    FOT       69662     156/0159  36027     TDRSS WEST OUTAGE

                ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO.   SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
-None this report period.

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-032    FOT       See List  June 04   30832     Generic Late Acquisition