UARS Weekly Status Report

09 March 2001




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                UARS WEEKLY STATUS REPORT - 09 MAR 2001

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***********
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 all the SOLSTICE
science objectives during this period of reduced tape recorder operations.

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

SUSIM performed its daily solar scans of the sun this past week during
periods of predicted UARS telemetry.

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

Nothing received.

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

     At the present time, PEM energy deposition from its spectrometers is not 
being generated.  Recent data configuration changes have affected PEM software 
causing multiple failures.  These failures are being reviewed by the PEM team.
In order to correct for new telemetry requirements, PEM will need to update 
processing code with a patch delivery.  The delivery patch may include changes 
which would allow the PEM software to execute on a DEC Alpha machine.  GSFC is
helping PEM with some DEC Alpha particulars which have caused PEM level 3
code to fail on DEC Alpha machines (software below level 3 executes on the
DEC Alpha).

     The PEM team is working on replacing the PEM:: machine with a DEC Alpha 
machine to be called PEM2K::.  PEM has requested DAP command capability with 
the CMS from PEM2K::.  Tests of the NRT data transfer from CDHF2:: through
PEM2K:: to the unix computer running the PEM GSE software show no difference
between equivalent NRT files transferred from PEM::.  Thus, NRT data from
CDHF2:: is captured correctly on PEM2K::.  Tests of the NRT data transfer
from CDHFB:: were not successful from both PEM:: and PEM2K::.  Results of the
test of NRT data transfers from the rehost computer acted like the rehost
computer did not recognize either PEM machine.  Investigation is underway.

    Updated HEPS calibration parameters have been finalized and are ready for 
delivery.  Updated MEPS quality calibration files have been finalized and are 
ready for delivery.  Level 3 software errors, discovered by Dr. Dean Pesnell, 
have been fixed; his suggestions have been incorporated with in the PEM 
production code.  Both updated HEPS and MEPS calibration data, along with the 
Level 3 code changes, will influence the in-situ energy deposition predictions,
so new versions of PEM energy deposition Level 3 files will be generated.

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

The HALOE instrument continues to perform well.  Nearly every scan is being
acquired by the combination of the tape recorder and the TDRS contacts.  
The HALOE Team convened its quarterly validation meeting on March 1, and 
the data for the period October 1 to December 31, 2000, have been certified 
for scientific study.  Because the HF profile data are occasionally corrupted 
by the presence of sunspots in the field-of-view for that channel, particularly
during this solar max period, users of the HF data are cautioned to check the 
quality flags in the HALOE data record for those occurrences.

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

Nothing received.

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

HRDI continues to function normally, making wind measurements during
the sunlit parts of orbits nearly every day, and measuring nighttime winds
when power is available.

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

Nothing received.

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

The MPG participated in the Monthly Status Review meeting for
UARS held on 7 March 2001.
 
Daily processing of instrument Daily Activity Plans continues
with no problems. Instrument operations schedule is now complete
to 19 April 2001.

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

 UARS CDHF REHOST:
   -  NRT is still on old system. Still have some users with problems on Rehost.
      Intention is to wait until after the YAW on March 15. 
   -  The following software has been recompiled and relinked and PC is
      testing new executables.  Status follows:
      -  Attitude Extraction V7.3 successful and promoted to production mode.
         Output test files were promoted from _TEST to _PROD.  Being processed
         on Current and Rehost Systems during parallel processing.
      -  Sensor Extraction V5.0 successful and promoted to production mode.
         Being processed on Rehost System only per FDF.
      -  Observatory Log V3.4 successful and promoted to production mode.
         Output test files were promoted from _TEST to _PROD.  Being processed
         on Rehost System only.
      -  HALOE V4.82 successful.  HALOE has successfully validated the output
         product and has requested an older UARS DAY to process to be compared
         with day processed on current system.
      -  HRDI V4.4 successful.  Currently waiting validation results from PI.
      -  GPI V4.05 successful.  Currently waiting validation results from PI.
      -  SUSIM V7.2 was successful against days designated by the SUSIM PI.
         SUSIM questions and concerns are being investigated.                 
STATUS                          
   The CDHF processed current day data through level 3 for all active
   instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
   (C) = Complete, (F)= Failed  (L) = Days remaining to reprocess.
                20 days SUS (7.2) PROD              (22R-22C=0L)
                  
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FOT
***********

                            REPORTING PERIOD

This report covers 24 February 2001 (Orbit 51690, GMT Day 055) through 02 March 
2001 (Orbit 51795, GMT Day 061).

                         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
-None this report period


The beta angle ranged between the angles of 47.0 degrees to 44.8 degrees for 
this report period.  The beta angle is now decreasing towards a minimum angle 
of 2 degrees on 15 March 2001 (DOY 074).

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 0.6 and 0.9 degrees C.  Additional battery performance data for each 
battery on 23 February 2001 and 03 March 2001 are provided in Appendix D.

The clock error ranged from Ð10.6 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            =  25


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

¥     FOT            =  02

One (1) Anomaly Report remained OPEN at the end of this report period (see 
Appendix E).

TRANSPONDER FREQUENCIES:
· Transponder A:  00/316  - 2287.496493
· Transponder B:  01/027  - 2287.499274


                      GROUND SYSTEM OPERATION


Two (2) 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 01/060 show the observatory data loss to be 300 hours, 19 
minutes, 59.848 seconds. This shows no change 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

UARS is using both the Fine Sun Sensor (FSS) and the Three Axis Magnetometer 
(TAM) as inputs to UFLTR this week.  The FOT is pleased with their performance, 
but continues to make adjustments to the TAM alignment to improve its 
performance and UARSÕ attitude.

                            MEETINGS

The FOT attended a UARS Shuttle Retrieval Presentation on Monday, February 25, 
2001.
The FOT attended a UARS Shuttle Retrieval Presentation on Wednesday, February 
27, 2001.
The FOT attended a UARS Flight Software Meeting on Thursday, March 01, 2001


                      FUTURE SIGNIFICANT EVENTS


The next UARS Yaw slew is scheduled for 15 March 2001 (DOY 074).  This maneuver 
will be a Forward to Reverse Flight maneuver (Northern 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 02 March 2001

ORBIT     AOS          NO.      SUBSYS     REASON
-----     ---          ---      ------     ------
51694     055/0624     01-119   NBTR       NOOPS D-055
51697     055/1132     01-120   OBC        Clk Adj 0.00 to 20.6 msec/day
51702     055/1824     01-121   NBTR       NOOPS D-056
51711     056/0847     01-121   NBTR       NOOPS D-056
51717     056/1825     01-122   NBTR       NOOPS D-057
51722     057/0305     01-123   OBC        Clk Adj 20.6 to 0.00 msec/day
51723     057/0446     01-122   NBTR       NOOPS D-057
51739     058/0627     01-124   NBTR       NOOPS D-058
51745     058/1547     01-127   OBC        Dump S/W banks
51745     058/1507     01-125   OBC        MAGMON update
51746     058/1647     01-128   OBC        System table dumps
51747     058/1827     01-026   NBTR       NOOPS D-059
51753     059/0448     01-129   OBC        Clk Adj 0.00 to 20.6 msec/day
51755     059/0710     01-126   NBTR       NOOPS D-059
51761     059/1648     01-130   OBC        TAM alignment
51762     059/1828     01-131   NBTR       NOOPS D-060
51768     060/0448     01-131   NBTR       NOOPS D-060
51776     060/1649     01-131   NBTR       NOOPS D-060
51777     060/1911     01-132   NBTR       NOOPS D-061
51779     060/2233     01-133   OBC        Clk Adj 20.6 to 0.00 msec/day
51784     061/0630     01-132   NBTR       NOOPS D-061
51785     061/0813     01-132   NBTR       NBTR PBK / RTS-58
51790     061/1510     01-134   MACS       TAM ALIGNMENT
51791     061/1650     01-132   NBTR       NOOPS D-061
51792     061/1830     01-135   NBTR       NOOPS D-062

___________________________________________________________________________

                            APPENDIX B
                OUT-OF-LIMITS & ALERTS OCCURRENCES
                   Week ending 02 March 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 02 March 2001

                  CLOCK DRIFT RATE ADJUSTMENTS

ORBIT     TIME         CLOCK RATE CHANGE
-----     -----        -----------------
51697     055/1135     Clk Adj from 0.00 to 20.6 msec/day
51722     057/0308     Clk Adj from 20.6 to 0.00 msec/day
51753     059/0452     Clk Adj from 0.00 to 20.6 msec/day
51779     060/2234     Clk Adj from 20.6 to 0.00 msec/day
___________________________________________________________________________

                           APPENDIX D
                 UARS BATTERY PERFORMANCE DATA
                   Week ending 02 March 2001


     23 Feb 2001 - GMT Day 054 Beta = 45.3 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    +00.0/-22.4    -3.05/-4.62  +0.0/+0.0     13.0    0.000      0.0
2    +11.2/-22.4    +4.51/+3.23  +27.2/-13.6   26.4    1.030     19.5
3    +22.4/-22.4    +3.87/+2.60  +26.4/-13.6   26.2    1.030     19.5


     03 Mar 2001 - GMT Day 062 Beta = 44.8 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    +16.8/+00.0    -3.68/-4.62   +0.0/+0.0    13.0    0.000     0.0
2    +16.8/-44.8    +5.15/+3.87   +26.8/-15.2  25.1    1.030     20.5
3    +22.4/-67.2    +4.51/+2.92   +26.4/-15.2  25.1    1.020     20.2


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

_______________________________________________________________________________

                                APPENDIX E
                     UARS ANOMALY REPORTS
                   Week ending 02 March 2001

                  NEW ANOMALY REPORTS GENERATED
AR NO.     SUBSYS     ORBIT     TIME       TTR     PROBLEM/DATA LOSS
------     ------     -----     ----       ---     -----------------
01-013     FOT        51763     059/2050   23669   TAC Crashed
01-014     FOT        51782     061/0206   14170   Generic Late Acquisition


            ANOMALY CLOSURE INFORMATION RECEIVED
AR NO.     SUBSYS     ORBIT     TIME       TTR     PROBLEM/DATA LOSS
------     ------     -----     ----       ---     -----------------
01-009     FOT        see list  Feb 01     14170   Generic Late Acquisition
01-013     FOT        51763     059/2050   23669   TAC Crashed

            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
------     ------     -----     ----       ---     -----------------
01-014     FOT        see list  Mar 01     14170   Generic Late Acquisition

	 	SEVNTFW01/08