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

                UARS WEEKLY STATUS REPORT - 26 Oct 2001

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

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

SOLSTICE continues to operate normally, taking solar data on all available
orbital tracking periods and stellar calibration observations whenever
possible. We continue to gather enough data to meet the SOLSTICE science
objectives during this period of reduced tape recorder operations.

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

SUSIM completed daily mid resolution and MgII solar scans
during periods of predicted UARS telemetry.

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

Sample ACRIM instrument data was received from PACOR-A for 10/17/01. 
Processing software was modified to accomodate the new level0 data 
nomenclature. Processing yielded normal results. The ACRIM2 results are 
available on the acrim.com web site.

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

***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****

     The PEM instrument is off at the current time.

     PEM would like to thank the project for their work on convincing NASA HQ 
to keep UARS alive and operating in campaign mode.  

     Tests of PEM Level 0 data transfer to PEM2K:: from PACOR-A failed.  
Failure was traced to the SwRI firewall blocking file transmission.  This has
been corrected and SwRI is ready to again test data transfers from PACOR-A.


*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.

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

Nothing received.

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

Nothing received.

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

WINDII held its 10th Anniversary Joint Science Team Meeting at
Niagara Falls, Canada, October 22-24. There were 22 attendees, including
not only WINDII colleagues from France, but special guests Ray Roble from
HAO/NCAR, John Emmert from Utah State and Shengpan Zhang from Millstone
Hill. In addition to scientific presentations, plans were made for a
further year of data analysis and operations, consistent with the
proposed Traceability Mission which happily was approved the next day.

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

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 13 October 2001 (Orbit 55156, GMT Day 286) through 19 
October 2001 (Orbit 55260, GMT Day 292).

                       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
         HALOE        286/0714     55161     Power OFF
         SUSIM        288/0022     55186     Power OFF
         SUSIM        292/1316     55254     Power ON (Part 1)
         SUSIM        292/1458     55255     Power ON (Complete)

A Forward-to-Reverse Yaw Around maneuver (number 103) was successfully executed 
in Orbit 55225 beginning 290/13:55:13 and completing at 290/14:32:23 on 17 
October 2001.  The SOLSTICE instrument was in day only and all other 
instruments were in their off or standby mode (including HRDI and PEM).  Due to 
the SA position at 269 degrees, the effective night length of the spacecraft 
after the maneuver was approximately 56.3 minutes.  Post maneuver analysis of 
data indicate that during the Yaw Around, the end-of-night load bus voltage was 
23.8 volts and the average depths of discharge (DODs) on Batteries 2 and 3 were 
approximately 22.1 and 23.4 percent respectively.  The next (forward-to-
reverse) YAW is scheduled for 17 October 2001 (DOY 290).

The beta angle ranged between the angles of 19.5 degrees to 7.1 degrees for 
this report period.  The beta angle is now increasing towards a maximum angle 
of 73 degrees on 7 November 2001 (DOY 311).

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 23.8 V end-of-night (EON) load bus voltage.  Battery 
temperatures are stable with a temperature delta between Battery 2 and Battery 
3 of 1.5 to 1.6 degrees C.  Additional battery performance data for each 
battery on 15 October 2001 and 22 October 2001 are provided in Appendix D.


The clock error ranged from Š15.8 to 13.0 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  =  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            =  10
„     HALOE          =  01
„     SUSIM          =  03
„     SOLSTICE       =  02


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

„     FOT            =  01


Zero (0) Anomaly Reports remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
· Transponder A:  01/267  - 2287.496874
· Transponder B:  01/263  - 2287.498962


                     GROUND SYSTEM OPERATION

One (1) operational support problems occurred this period.  Anomaly Reports are 
included in Appendix E.

The data loss calculations supplied by Data Capture Facility (DCF) from mission 
start through UTC Day 01/277 show the observatory data loss to be 303 hours, 18 
minutes, and 28.016 seconds. This shows no change in data loss since the last 
report period. This is a 0.39 percent data loss, which equals a 99.61 percent 
data capture for the mission.

                   OTHER SIGNIFICANT EVENTS

                   UARS SATELLITE OPERATIONS

The FOT has begun the process of implementing RaytheonÕs Eclipse ground system 
and continues to work on the TAC replacement system.  These new systems will 
provide enhanced capability and make up for the loss of some UARS facilities, 
which have been shut down due to budgetary reasons.  This will be a huge effort 
and must be completed as soon as possible in order to provide a low cost method 
for flying UARS.  The FOT will need assistance from all entities involved to 
insure the success of this operation.  The estimated time for completion is 
April 2002.


                            MEETINGS

The UARS FOT attended a UARS Operational Plan Meeting on Wednesday, October 17, 
2001.
The UARS FOT attended an Eclipse Training Meeting on Thursday, October 18, 
2001.

                     FUTURE SIGNIFICANT EVENTS

The next UARS Yaw slew is scheduled for 26 November 2001 (DOY 330).  This 
maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere 
viewing).


Attachments:  Appendix A,  Real-time Commands 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 19 October 2001

ORBIT     AOS          NO.        SUBSYS     REASON
-----     ---          ---        ------     ------
55159     286/0529     01-623     NBTR       NOOPS D-286
55162     286/0901     01-623     NBTR       NOOPS D-286
55168     286/1947     01-623     NBTR       NOOPS D-286
55161     286/0714     01-624     HALOE      Power OFF
55175     287/0537     01-623     NBTR       PBK
55186     288/0022     01-626     SUSIM      Power OFF
55186     288/0022     01-627     SOLSTICE   DAY-ONLY MODE
55224     290/1304     01-629     MACS       YAW MANUEVER START
55225     290/1459     01-629     MACS       YAW MANUEVER DONE
55226     290/1638     01-630     MACS       TAM FSS
55230     290/2255     01-631     OBC/CLK    Clk Adj -20.6 to 0.00 msec/day
55234     291/0444     01-632     OBC/CLK    Clk Adj  0.00 to 20.6 msec/day
55246     292/0036     01-633     SOLSTICE   Full time ops
55249     292/0400     01-634     OBC        Clk Adj fr 20.6 to 0.00 msec/day
55254     292/1316     01-635     SUSIM      Power ON (Part 1)
55255     292/1458     01-635     SUSIM      Power ON (Complete)
__________________________________________________________________________________

                              APPENDIX B
                  OUT-OF-LIMITS & ALERTS OCCURRENCES
                     Week ending 19 October 2001

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 19 October 2001

CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME         CLOCK RATE CHANGE
-----     -----        -----------------
55230     290/2302     Clk Adj fr -20.6 to 0.00 msec/day
55234     291/0446     Clk Adj fr 0.00 to 20.6 msec/day
55249     292/0402     Clk Adj fr 20.6 to 0.00 msec/day
___________________________________________________________________________

                             APPENDIX D
                  UARS BATTERY PERFORMANCE DATA
                   Week ending 19 October 2001


     15 October 2001 - GMT Day 288 Beta = 6.7 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    +728.0/+728.0   -3.68/-4.62   +0.0/ -0.0     11.7      0.000     0.0
2    +00.0/ -95.2    +5.00/+4.19   +28.5/-12.8    25.9      1.040     19.9
3    +22.4/ -22.4    +3.87/+2.92   +27.4/-12.2    25.8      1.020     19.5


     22 October 2001 - GMT Day 295 Beta = 21.1 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    +728.0/+728.0   -3.57/-4.94   +0.0/ -0.0     11.3      0.000      0.0
2    +00.0/ -22.4    +5.15/+3.55   +28.8/-14.5    29.1      1.040      20.9
3    +22.4/ -50.4    +4.19/+2.60   +28.1/-14.3    29.0      1.030      20.5
    

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


                                  APPENDIX E
                        UARS ANOMALY REPORTS
                      Week ending 19 October 2001

                    NEW ANOMALY REPORTS GENERATED

AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
------     ------     -----     ----        ---     -----------------
01-060     FOT        55163     286/1123    24071   Drop Out on the Ret. Link


                ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.     SUBSYS     ORBIT     TIME        TTR     PROBLEM/DATA LOSS
------     ------     -----     ----        ---     -----------------
01-060     FOT        55163     286/1123    24071   Drop Out on the Ret. Link


              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
------     ------     -----     ----        ---     -----------------
-None this report period
	 	SEVNTFW01/42