UARS Weekly Status Report

16 July 2004




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                UARS WEEKLY STATUS REPORT - 16 JUL 2004

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

SOLSTICE began day only operations on Thursday in support of the yaw 
maneuver. This mode  continues until July 21. Otherwise, the instrument 
continues to perform exceptionally, taking solar data on all available 
orbital tracking periods. An average of 63% of data were returned this 
week accounting for 495 minutes of solar observing time.

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

Nothing received.

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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 2003289. MEPS data files between
2003290 and 2003365 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

     Requests have been received for storm spectral data.  Overview plots were 
produced and these plots may be found on the web at
http://climatology.space.swri.edu/UARS_images_postedJune2004.html
for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000, 
March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and 
November 11-12 of 2001.

*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 
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Nothing received.

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MLS
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Nothing received.

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HRDI
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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.

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

Nothing received.
                  
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FOT
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                           REPORTING PERIOD

This report covers 03 July 2004 (Orbit 70096, GMT Day 185) through  09
July 2004 (Orbit 70202, GMT Day 191).


                         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         186/1631      70122     POWER ON / BORESITE GAINS


The beta angle ranged between the angles of 63.8 degrees to 36.5
degrees for this report period.  The beta angle is now decreasing
towards a minimum angle of 0 degrees on 18 July 2004 (DOY 200).

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 1.27 to 1.28 degrees C.  Additional
battery performance data for each battery on 02 July and 09 July 2004
are provided in Appendix D.

The clock error ranged from 10.1 to –11.6 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       =    04
•    HALOE     =    01


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

•    FOT       =    05
•    SOLSTICE  =    01

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


                        GROUND SYSTEM OPERATION

Six (6) operational support problems 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 database on the new Eclipse software build was validated last week
for both command and telemetry.  With this step completed, the FOT
will begin testing the DRs fixed in this build.  The goal for the
testing to be complete is the end of the July.  At that time this new
build will be released to operations.


                               MEETINGS


The FOT attended the UARS Monthly Status Review on 05 July 2004 to
discuss the significant events for the month of June.


                                   
                       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 09 July 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
70099   185/0254   04-198   OBC/CLK     CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
70101   185/0656   04-199   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
70102   186/1631   04-200   HALOE       POWER ON / BORESITE GAINS
70134   187/1149   04-201   OBC/CLK     CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
70154   188/1944   04-202   OBC/CLK     CLK ADJ FR 20.6 TO 0.0 MSEC/DAY


                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                       Week ending 09 July 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 09 July 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
70099          185/0255               CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
70101          185/0658               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
70134          187/1152               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
70154          188/2004               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY

                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                       Week ending 09 July 2004

     02 July 2004 - GMT Day 184 Beta = 66.0 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    -700.0/-700.0  -2.42/-3.68  +00.0/+00.0  07.0     0.00      0.0
2     +00.0/-33.6   +3.23/+2.29  +18.8/-12.8  27.0     1.00     15.6
3     +11.2/-33.6   +2.60/+1.66  +18.0/-12.8  27.0     1.01     15.4

     09 July 2004 - GMT Day 191 Beta = 36.5 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    -700.0/-700.0  -3.05/-4.62  +00.0/+00.0  07.0     0.00     0.0
2     +11.2/-134.4  +5.15/+3.87  +26.4/-14.4  25.1     1.04    19.7
3     +22.4/-067.2  +3.87/+2.60  +25.6/-14.0  25.1     1.02    19.3

     V/T LEVEL CHANGES
ORB#           AOS TIME   LVL FR-TO
-----          --------   ---------
-None this report period.
                                   

                               APPENDIX E
                         UARS ANOMALY REPORTS
                       Week ending 09 July 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS     PROBLEM/DATA LOSS
------    ------    -----     ----      ---     -----------------
04-039    FOT       70177     185/1558  30832   Generic Late Acquisition
04-040    SOLSTICE  70140     187/2029  N/A     SOLSTICE Microload Problem
04-039    FOT       70164     189/1143  30832   Generic Late Acquisition
04-041    FOT       70167     189/1621  36316   Late Acq. due to Guam equip
04-042    FOT       70177     190/0739  36321   Late Acq. Software prob @ WSGT
04-039    FOT       70183     190/1757  30832   Generic Late Acquisition

                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS     PROBLEM/DATA LOSS
------    ------    -----     ----      ---     -----------------
04-032    FOT       See List  June 04   30832   Generic Late Acquisition
04-034    PEM AXIS  70000     178/1357  N/A     AXIS 1-2 OFF /ERRORS
04-035    PEM AXIS  70003     178/1729  N/A     AXIS TURN ON/COP INITIAL
04-036    FOT       70003     178/1729  36240   TELEMETRY DROPOUT/WS WEATHER
04-037    FOT       70005     178/2057  36242   Late Acq - Bad Weather at Guam
04-038    FOT       70040     181/0448  36295   TLM Dropouts- Weather @ WSGT

                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
------    ------    -----     ----      ---     -----------------
04-039    FOT       See List  July 04   30832   Generic Late Acquisition
04-040    SOLSTICE  70140     187/2029  N/A     SOLSTICE Microload Problem
04-041    FOT       70167     189/1621  36316   Late Acq. due to Guam equip
04-042    FOT       70177     190/0739  36321   Late Acq. Software prob @ WSGT