UARS Weekly Status Report

2 April 2004




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                UARS WEEKLY STATUS REPORT - 02 APR 2004

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

SOLSTICE was operating during daylight only for four days this week in 
support of the yaw maneuever. Otherwise, SOLSTICE continued to operate 
in good health gathering solar data on all available orbital tracking 
periods. On average, we received 62% of each day's data amounting to 
about 400 minutes of solar observing time per day.

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

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

As a result of the 3-TDRS operation, we have been able to fully resume
nearly all of the scans that were routinely at the start of the UARS
mission.  The weekly high (0.15 nm) resolution full spectrum
(115-410 nm) solar scans, the daily low resolution full spectrum
scans, and the daily scans of selected solar features at high
resolution (aka continuous monitoring) will now be performed on their
respective cadences without data gaps resulting from the limitations
of available telemetry.  Resumption of the remaining activities done
earlier in the UARS mission (ozone occulatations and gridded offset
manuevers) are now being considered.

Again, many thanks to those who made the 3-TDRS operation possible.

***********
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 1995299.  MEPS data files between
1995300 and 1995365 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 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.



*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.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

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 20 March 2004 (Orbit 68518, GMT Day 080) through 26
March 2004 (Orbit 68623, GMT Day 086).


                         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
       HRDI          086/0143      68609     TO LOW POWER MODE
       HALOE         086/0806      68613     Power OFF due to low power


The beta angle ranged between the angles of 40.6 degrees to 12.1
degrees for this report period.  The beta angle is now decreasing
towards a minimum angle of 0 degrees on 29 March 2004 (DOY 089).

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 1.92 to 2.54 degrees C.  Additional
battery performance data for each battery on 19 March and 26 March
2004 are provided in Appendix D.

The clock error ranged from 05.6 to -11.0 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  =    01
    ALERTS         =    00

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

    FOT       =    02
    HRDI      =    01
    HALOE     =    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).


                        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 transitioned the CMS to the new software on 15 March 2004.
All loads are being built on this new version without incident.  This
was done to prepare for the start of 3-TDRS operations, which began on
17 March 2004.  The FOT is now taking 35-38 events per day (up from 26-
28 per day under 2-TDRS operations) and now collecting data for an
additional 18-20% more of each orbit.  This 3-TDRS mode will be the
nominal mode from now on.  This new mode will be closely examined to
see if any slight modifications may be needed in the future, but none
are planned at this time.  The FOT would like to once again thank all
those involved in making this happen and thank science for being
patient with this effort.  Any feedback from science on how this mode
is working for them would be greatly appreciated.


                               MEETINGS


-None this report period




                                   
                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 29 March 2004 (DOY 089).  This
maneuver will be a Reverse to Forward Flight maneuver (Southern
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 26 March 2004


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
68605   085/2008   04-089   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
68607   085/2147   04-090   OBC/CLK     CLK ADJ FR 20.6 TO -20.6 MSEC/DAY
68609   086/0143   04-091   HRDI        HRDI TO LOW POWER MODE
68613   086/0806   04-092   HALOE       POWER OFF DUE TO LOW POWER



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 26 March 2004

The following Out-Of-Limits occurrences were detected:

MNEMONIC       STATE   DESCRIPTION                ORBITS
--------       -----   -----------                ------
OBSBATVEON3    Y-LO    Battery 3 Voltage at EON   68613


The following ALERT occurrences were detected:

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



                              APPENDIX C
                 CLOCK & SOLAR ARRAY RATE CORRECTIONS
                       Week ending 26 March 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
68605          085/2012               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
68607          085/2152               CLK ADJ FR 20.6 TO -20.6 MSEC/DAY


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 26 March 2004


     19 March 2004 - GMT Day 079 Beta = 40.7 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 -3.05/-4.31  +00.0/+00.0  07.0     0.00      0.0
2     +11.2/-095.2 +5.79/+4.50  +27.2/-15.2  24.8     1.04     21.5
3     +22.4/-078.4 +4.82/+3.55  +26.4/-15.2  24.6     1.04     21.0





     26 March 2004 - GMT Day 086 Beta = 12.1 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    -700.0/-700.0 -3.05/-4.63  +00.0/+00.0  07.0     0.00      0.0
2     +11.2/-134.4 +5.79/+3.87  +28.0/-14.4  23.7     1.02     19.8
3     +22.4/-089.6 +5.14/+2.60  +27.2/-14.4  23.5     1.02     19.5


     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
-None This Report Period.


                              APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 26 March 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-014    FOT       68524     080/1004  30832     Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-015    FOT       68430     074/0401  35722     Late Acquisition

                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
------    ------    -----     ----      ---       -----------------
04-014    FOT       See List  Mar 04    30832     Generic Late Acquisition