UARS Weekly Status Report

22 February 2002




********************************************************************

                UARS WEEKLY STATUS REPORT - 22 FEB 2002

********************************************************************

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

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

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

SUSIM performed its daily mid-resolution and MgII solar scans
during periods of predicted UARS telemetry.

Measurements of the solar FUV irradiance were obtained for use in
comparing with TIMED/SEE and its calibration rocket by SUSIM at
mid (1.1 nm) and high (0.15 nm) resolutions on Feb. 8 and 11.

We ammend and correct last weeks report in the following.  Most
backlogged level 0 data from December and January was obtained
directly from the CDHF. The deliveries of these same data from the
PACOR-A system are proceeding with recent deliveries of December
data.  We are processing the data including those needed for the
MgII index as soon as they can be obtained irrespective of their
source.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

Nothing received.

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

The MPG participated in the UARS ECLIPSE System 
Meeting on 21 February 2002.

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.

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

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

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

                           REPORTING PERIOD

This report covers 09 February 2002 (Orbit 56943, GMT Day 040) through
15 February 2002 (Orbit 57047, GMT Day 046).

                         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
PEM           040/0005      56943     Power ON, ZEPS HEPS to day only



The  beta  angle ranged between the angles of 21.51 degrees  to  39.49
degrees  for  this  report period.  The beta angle is  now  decreasing
towards a minimum angle of 0 degrees on 08 March 2002 (DOY 067).
   
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 24.80 V end-of-night (EON) load bus
voltage.   Battery  temperatures are stable with a  temperature  delta
between Battery 2 and Battery 3 of 1.31 to 0.63 degrees C.  Additional
battery performance data for each battery on 09 February 2002  and  15
February 2002 are provided in Appendix D.

The  clock  error  ranged from -13.0 to 12.5 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            =    8
    PEM            =    1

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

    FOT            =    1

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

TRANSPONDER FREQUENCIES:
    Transponder A:  01/333  - 2287.496855
    Transponder B:  02/002  - 2287. 498845


                        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


RTS  and  ephemeris loads were sent to UARS from Eclipse as  scheduled
this  week.  The RTS load was sent on 12 February 2002 on the 043/1755
and  the Ephemeris load on the 045/1856 event.  Both of the loads were
verified   by  telemetry  and  executed  on  board  successfully.    A
microprocessor load is scheduled to be sent to SUSIM next week.


                               MEETINGS

The  FOT  attended  a UARS CECIL PROC Review on Monday,  February  11,
2002.

The  FOT attended a UARS Eclipse Working Meeting on Thursday, February
14, 2002.


                       FUTURE SIGNIFICANT EVENTS


The next UARS Yaw slew is scheduled for 08 March 2002 (DOY 067).  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 15 February 2002

ORBIT   AOS        NO.      SUBSYS      REASON
-----   ---        ---      ------      ------
56943   040/0005   020-049  PEM         Power ON, ZEPS HEPS to day only
56944   040/0225   02-050   OBC         Clk Adj fr -20.6 to 0.00 msec/day
56986   042/2122   02-051   OBC         Clk Adj fr 0.00 to 20.6 msec/day
56999   043/1755   02-052   OBC         RTS 24 LOAD
57006   044/0410   02-052   OBC         Clk Adj fr 20.6 to 0.00 msec/day
57012   044/1349   02-054   OBC         Clk Adj fr 0.0 to -20.6 msec/day
57024   045/0919   02-055   OBC         Clk Adj fr -20.6 to 0.00 msec/day
57027   045/1535   02-056   OBC         Clk Adj fr 0.00 to 20.6 msec/day
57030   045/1856   02-057   OBC         Ephem loaded through Eclipse system


                                   
                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 15 February 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 15 February 2002

                     CLOCK DRIFT RATE ADJUSTMENTS

ORBIT          TIME                   CLOCK RATE CHANGE
-----          -----                  -----------------
56944          040/0236               Clk Adj fr -20.6 to 0.00 msec/day
56986          042/2124               Clk Adj fr 0.00 to 20.6 msec/day
57006          044/0411               Clk Adj fr 20.6 to 0.00 msec/day
57012          044/1352               Clk Adj fr 0.0 to -20.6 msec/day
57024          045/0920               Clk Adj fr -20.6 to 0.00 msec/day
57027          045/1539               Clk Adj fr 0.00 to 20.6 msec/day


                              APPENDIX D
                     UARS BATTERY PERFORMANCE DATA
                     Week ending 15 February 2002


  09 February 2002 - GMT Day 040 Beta = 21.51 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  -44.8/-67.2  -3.16/-4.08  +0.0/ -0.0   10.72    0.000    0.00
2  +22.4/-50.4  +6.47/+5.80  +29.6/-14.0  24.80    1.030    21.79
3  +22.4/-33.6  +5.47/+4.48  +29.2/-14.4  24.80    1.030    21.67


  15 February 2002 - GMT Day 046 Beta = 39.49 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  -44.8/-56.0  -3.16/-4.38  +0.0/ -0.0   10.72    0.000    0.00
2  +11.2/-50.4  +5.14/+4.48  +27.2/-14.4  26.08    1.040    20.27
3  +22.4/-22.4  +4.48/+3.82  +26.4/-14.4  26.08    1.030    20.04

      V/T LEVEL CHANGES
ORB#          TIME       LVL FR-TO
-----         ----       ---------
-no changes    V/T 5

   

                              APPENDIX E
                         UARS ANOMALY REPORTS
                     Week ending 15 February 2002

                     NEW ANOMALY REPORTS GENERATED
AR NO.    SUBSYS    ORBIT     TIME      TTR       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-005    FOT       57016     044/2037  14170     Generic Late Acquisition

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

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

                         OPEN ANOMALY REPORTS
AR NO.    SUBSYS    ORBIT     TIME      TTR       PROBLEM/DATA LOSS
------    ------    -----     ----      ---       -----------------
02-004    SOLSTICE  56883     036/0050  N/A       Solstice in Wrong Mode
02-005    FOT       see list  Feb 02    14170     Generic Late Acquisition