UARS Weekly Status Report

15 November 2002




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                UARS WEEKLY STATUS REPORT - 15 NOV 2002

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

SOLSTICE continues to operate normally, taking solar data on all 
available orbital tracking periods.

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

Despite the unexpected UARS shutdown, SUSIM successfully gathered all
of its daily mid-resolution and MgII solar scans this past week
during periods of predicted UARS telemetry.

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

The ACRIM2 Science Team has  submitted FOT control sequences designed to 
test the ability to  stimulate instrument turn-on by switching power 
busses A and B off and on. Reproduction of the power-on that occured after 
the 8/01 TMON is sought.

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

     The PEM web site has moved.  It has a new URL.  Access the PEM web site
using http://wwwpem.space.swri.edu.  The PEM data from the GUVI conjunction
periods has moved to  http://wwwpem.space.swri.edu/guvi-pem.html.

     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, all HEPSA data between 1991274 and 1992119 has been 
reprocessed and is archived in the DAAC.  HEPSA data for 1992120, between 
1992122 and 1992128, and between 1992130 and 1992199 have been reprocessed
and waiting DAAC archival.

     PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period.  Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.  
GUVI images from other times from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present.  Separation
is several minutes to 10's of minutes when both instruments saw aurora. 
PEM has seen no aurora during the second conjunction period.  PEM data is
being processed for the third conjunction period.

     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.

*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 assisted with troubleshooting the problem
of DECNET communications between instrument Remote
Analysis Computers and the UARS Command Management
System until the problem was resolved on 13 November.
 
The MPG continues to serve as the point-of-contact for UARS
instrument operations to support re-engineering of the UARS
Mission Operations Concept to develop capabilities for the
Science Traceability Mission.

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

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

                           REPORTING PERIOD

This report covers 02 November 2002 (Orbit 60940, GMT Day 306) through
08 November 2002 (Orbit 61044, GMT Day 312).


                         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          308/1941      60982     POWER ON
       PEM           309/2309      60999     AXIS POWER OFF
       HALOE         310/1254      61008     POWER ON

The  beta  angle  ranged between the angles of 65.5  degrees  to  44.6
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 19 November 2002 (DOY 323).

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 0.96 to 1.28 degrees C.  Additional
battery  performance  data for each battery  on  01  November  and  08
November 2002 are provided in Appendix D.

The  clock  error  ranged from -12.0 to 10.5 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       =    05
    HRDI      =    02
    PEM       =    01
    HALOE     =    02
    WINDII    =    01


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

    FOT  =    00

Two  (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).


                        GROUND SYSTEM OPERATION

Zero  (0) 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 FOT is happy to report that we have successfully recovered from
the OBC halt anomaly which occurred on 21 October 2002.  All
instruments that are scheduled on are now back on including HRDI.  The
FOT observed a HRDI HPC protection telemetry point toggling at a
fairly rapid pace before the anomaly.  The HRDI PI team was notified
of this and investigated this circuitry.  They found that this
signature occurs nominally and did not believe this to have caused the
OBC halt.  Data was pulled by the FOT which confirmed that signature
is nominal.  HRDI was powered back on on the 308/1941.

A full analysis of the OBC hardware dumps, which were taken
immediately after the anomaly, has not revealed any indications of any
abnormal behavior.  The FOT is planning to try to load this image to
the simulator in order to discover more about the state of the OBC
during the anomaly.  If this test does not show any clues about the
problem then the cause of the anomaly may remain a question mark (or
be attributed to a single event upset).  The investigation continues
but as of right now there are no firm leads to follow.

                               MEETINGS


     The  FOT  attended the UARS Monthly Status Review on 06 November 2002.


                       FUTURE SIGNIFICANT EVENTS


The  next  UARS Yaw slew is scheduled for 18 November 2002 (DOY  322).
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 08 November 2002


ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
60973   308/0603   02-424   OBC/CLK     CLK ADJ 20.6 TO 0.00 MSEC/DAY
60982   308/1941   02-425   HRDI        POWER ON
60986   309/0200   02-426   HRDI        PB TELE ON
60994   309/1439   02-427   TAM         TAM REV ALIGN
60999   309/2309   02-428   PEM         AXIS POWER OFF
61003   310/0600   02-429   OBC/CLK     CLK ADJ 0.00 TO 20.6 MSEC/DAY
61008   310/1254   02-430   HALOE       POWER ON
61028   311/2121   02-431   OBC/CLK     CLK ADJ 20.6 TO 0.00 MSEC/DAY
61039   312/1532   02-432   WINDII      WINDII ERR CLEAR
61042   312/1932   02-433   HALOE       DAP CMDS
61043   312/2045   02-434   OBC         SOFT BANK DUMPS



                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 08 November 2002

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 08 November 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
60973          308/0605               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
61003          310/0602               CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
61028          311/2131               CLK ADJ FR 20.6 TO 0.0 MSEC/DAY



                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 08 November 2002

     01 November 2002 - GMT Day 304 Beta = 68.0 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  -145.6/-179.2 -3.05/-4.31  +00.0/+00.0  08.3     0.000     0.0
2   +05.6/-33.6  +3.23/+1.97  +19.2/-16.0  26.6     1.040    15.5
3   +16.8/-22.4  +2.60/+1.34  +18.4/-15.2  26.4     1.030    15.0


     08 November 2002 - GMT Day 312 Beta = 44.6 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  -151.2/-179.2 -3.05/-4.62  +00.0/+00.0  08.3     0.000     0.0
2   +11.2/-44.8  +5.47/+4.51  +27.2/-15.2  24.8     1.040    20.5
3   +22.4/-22.4  +4.51/+3.23  +26.4/-15.2  24.8     1.030    20.2


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



                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 08 November 2002

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

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

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

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      CDS       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-053    FOT       60630     285/1008  30382     GENERIC LATE ACQUISITION
02-056    FOT       60775     295/0122            OBC CRASH