UARS Weekly Status Report

08 October 2004




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                UARS WEEKLY STATUS REPORT - 08 OCT 2004

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

This week, SOLSTICE continued to operate in good health gathering solar 
data on all available orbital tracking periods. On average, we received 
64% of each day's data amounting to about 570 minutes of solar 
observing time per day.

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

During this past week and as available telemetry time permitted,
SUSIM successfully gathered daily mid (1.1 nm) resolution, MgII,
occultation, solar pointing offset, and continuous monitoring
scans.

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

HEPSA data files are version 2.  Currently, HEPSA data between 1991274 and 
2004139 has been reprocessed and archived at the GSFC DAAC.  HEPSA Level 2
data files from 2004140 to 2004159 are processed and waiting for archiving.

MEPS data files are version 1.  Processed MEPS data files at the DAAC archive 
are between 1991274 and 2004139.  MEPS Level 2 data files from 2004140 to 
2004159 are processed and waiting for archiving.

PEM continues to receive NMC data files from NOAA.  No problems have
been encountered.

     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.

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

Nothing received.

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

Nothing received.

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

Nothing received.

***********
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  25 September 2004 (Orbit  71361,  GMT  Day  269)
through 01 October 2004 (Orbit 71465, GMT Day 275).


                         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
       SOLSTICE      271/1247      71398     SOLSTICE TO FULLTIME OPS
       SUSIM         271/1511      71400     POWER ON
       HALOE         273/1324      71429     POWER ON
       PEM           274/1321      71444     ZEPS & NEPS TO DAY ONLY


A Forward-to-Reverse Yaw Around maneuver (number 133) was successfully
executed in Orbit 71370 beginning 269/ 15:10:32Z and completing at
269/ 1 5:47:42Z on 25 September 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 57.62 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 19.92 percent
respectively.  The next (reverse-to-forward) YAW is scheduled for 02
November 2004 (DOY 307).

The beta angle ranged between the angles of 0.7 degrees to 28.6
degrees for this report period.  The beta angle is now increasing
towards a maximum angle of 65 degrees on 13 October 2004 (DOY 287).

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 0.64 to 0.65 degrees C.  Additional
battery performance data for each battery on 24 September and 01
October 2004 are provided in Appendix D.

The clock error ranged from 11.2 to -10.4 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
    SOLSTICE  =    01
    SUSIM     =    01
    HALOE     =    02
    PEM       =    01


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

    FOT       =    05

Three (3) Anomaly Report remained OPEN at the end of this report
period (see Appendix E).


                        GROUND SYSTEM OPERATION

Five (5) 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


A problem was found this week in the new release of the CMS code.  The
issue is believed to be with the namelist files, but software
development is looking into the exact cause.  FDF has also been asked
to provide a User Antenna Views file which contains SMA codes.  This
is needed to complete the CMS processing of SMA supports.  A meeting
will be held with FDF to discuss this issue.  These two problems have
delayed the release of the new CMS code to operations.  No new date
has been set for completion.

                               MEETINGS


-None this report period.


                                   
                       FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 02 November 2004 (DOY 307).
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 01 October 2004

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
71370   269/1503   04-275   MACS        YAW MANEUVER - BEGIN
71370   269/1615   04-275   MACS        YAW MANEUVER - END
71374   269/2204   04-276   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71398   271/1247   04-277   SOLSTICE    SOLSTICE TO FULLTIME OPS
71400   271/1511   04-278   SUSIM       BEGIN POWER ON
71411   272/0921   04-278   SUSIM       POWER ON COMPLETE
71429   273/1324   04-279   HALOE       POWER ON - PART I
71431   273/1644   04-280   HALOE       POWER ON - PART II
71444   274/1321   04-281   PEM         ZEPS & NEPS TO DAY ONLY
71449   274/2118   04-282   OBC/CLK     CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71465   275/2330   04-283   OBC/CLK     CLK ADJ FR -20.6 TO 0.0 MSEC/DAY



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                      Week ending 01 October 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 01 October 2004

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
71374          269/2204               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71449          274/2118               CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71465          275/2335               CLK ADJ FR -20.6 TO 0.0 MSEC/DAY

                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                      Week ending 01 October 2004

     24 September 2004 - GMT Day 268 Beta = 04.4 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      00.0/-50.4    +4.83/+3.87  +27.2/-12.0   25.9     1.02      19.3
3      11.2/-89.6    +3.87/+2.60  +26.8/-12.0   25.8     1.01      18.9

     01 November 2004 - GMT Day 275 Beta = 28.6 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/-3.68  +00.0/+00.0   07.0     0.00       0.0
2      00.0/-44.8    +5.79/+5.15  +27.2/-13.6   26.9     1.02      19.7
3     -16.8/-78.4    +4.51/+3.87  +26.0/-13.2   26.7     1.02      19.0

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


                              APPENDIX E
                         UARS ANOMALY REPORTS
                      Week ending 01 October 2004

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-063    FOT       71416     272/1647  30832     Generic Late Acquisition
04-063    FOT       71433     273/2000  30832     Generic Late Acquisition
04-064    FOT       71435     273/2302  37111     Data Dropout / bad weather
04-065    FOT       71452     275/0256  37125     Bad Weather at GUAM
04-063    FOT       71463     275/1940  30832     Generic Late Acquisition


                 ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
04-061    FOT       71286     264/0156  36997     Data Dropout
04-062    FOT       71288     264/0418  36998     Data Dropout

                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
------    ------    -----     ----      ---       -----------------
04-063    FOT       See List  Sept 04   30832     Generic Late Acquisition
04-064    FOT       71435     273/2302  37111     Data Dropout / bad weather
04-065    FOT       71452     275/0256  37125     Bad Weather at GUAM