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UARS WEEKLY STATUS REPORT - 03 Mar 2000
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SOLSTICE
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We continue to gather enough data to meet all the SOLSTICE science
objectives during this period of reduced tape recorder operations.
SOLSTICE operates normally, collecting solar data on all available
orbital tracking periods and stellar calibration observations whenever
possible.
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SUSIM
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SUSIM continues to gather a near normal set of daily solar scans that
are scheduled for periods of predicted telemetry.
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ACRIM
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Nothing received.
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PEM
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The PEM spectrometers continue to be active under PMON control*. AXIS-2
was activated on February 29 to complete the total AXIS activation. At the
present time, PEM energy deposition 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 most likely need to update processing code
with a patch delivery. At this time, updated HEPS calibration parameters will
be submitted. These 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.
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HALOE
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Nothing received.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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The following report from WINDII was received on 25 Feb,
but it was accidently overlooked when the 25 Feb 2000
Status Report was prepared.
WINDII REPORT FOR THE WEEK ENDING February 25, 2000
WINDII is next scheduled to operate March 5-16, 2000.
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MPG
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Routine processing of instrument Daily Activity Plans continues
with no problems. The instrument operations schedule for the
next yaw period (21 March to 25 April 2000) was coordinated
and distributed.
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CDHF
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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.
*2 days ATT (7.3) PROD (2R-2C=0L)
*2 days OBC (3.4) PROD (2R-2C=0L)
*1 day PEM (3.32) PROD (L1-L2) (1R-1C=0L)
*2 days SUS (7.2) PROD (L1-L3) (2R-2C=0L)
18 days WIN (5.11A) PROD (L1-L3) (522R-482C-14F=40L)
2 days SEN (5.0) PROD (1992) (2R-2C=0L)
*The CDHF reprocessed ATTITUDE, OBC, PEM, and SUSIM against the LEVEL0
data that was re-ingested with better quality for UARS DAY 3083 and 3084.
Data created in the month of December 1999 has been loaded into the DAAC
Transfer Tables for HALOE, NMC, UKMO, and PEM.
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FOT
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REPORTING PERIOD
This report covers 19 February, 2000 (Orbit 46129, GMT Day 050) through 25
February 2000 (Orbit 46233, GMT Day 056).
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 055/0008 46203 AXIS-1 On
The beta angle ranged between the angles of 9.4 degrees to 35.2 degrees for
this report period. The beta angle is now increasing toward a maximum angle
of 51 degrees on 04 March 1999 (DOY 064).
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 0.7 to 1.0 degrees C.
Additional battery performance data for each battery on 18 February 2000 and 25
February 2000 are provided in Appendix D.
The clock error ranged from 10.7 to -10.8 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 = 02
% ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% FOT = 015
% HALOE = 02
% PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix E
and summarized below.
% FOT = 01
Three (3) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
7 Transponder A: 00/021 - 2287.496849
7 Transponder B: 00/031 - 2287.498836
GROUND SYSTEM OPERATION
One (1) operational support problem 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 00/055 show the observatory data loss to be 565 hours, 38
minutes, 19.273 seconds (an increase of 0 minutes 0 seconds since the last report
period).
100 percent data capture was observed this past week.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT worked on SCS-21 by providing data for the development of a new trending
system for UARS. The FOT has been providing instruction into the details on the
capabilities of the current trending utility. The FOT is looking forward to an
improvement in this area. A new trending tool could reduce trend time from hours to
minutes. In addition, the FOT also provided to the SCS-21 folks, a list and snaps
of all display pages.
MEETINGS
February 24, 2000 (DOY 055) - The FOT went over to the Landsat 5 operations control
center to observe their inclination maneuver. That mission is similar to the UARS
mission therefore it was interesting to relate the configuration and dynamics of the
maneuvers to the UARS spacecraft
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for March 21, 2000 (DOY 081). 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 25 February 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
46129 050/0055 00-057 HALOE Power ON
46133 050/0755 00-058 HALOE HTR MTR ON
46140 050/1848 00-059 NBTR NBTR MANAGEMENT
46147 051/0616 00-059 NBTR NBTR MANAGEMENT
46155 051/1817 00-060 NBTR NBTR MANAGEMENT
46161 052/0435 00-060 NBTR NBTR MANAGEMENT
46170 052/1857 00-061 NBTR NBTR MANAGEMENT
46176 053/0439 00-061 NBTR NBTR MANAGEMENT
46191 054/0442 00-062 NBTR NBTR MANAGEMENT
46199 054/1644 00-062 NBTR NBTR MANAGEMENT
46200 054/1905 00-063 NBTR NBTR MANAGEMENT
46203 055/0008 00-064 PEM PEM AXIS 1 ON
46211 055/1313 00-066 OBC Clk Adj fr 0.00 to 20.6 msec/day
46214 055/1647 00-063 NBTR NBTR MANAGEMENT
46215 055/1828 00-065 NBTR NBTR MANAGEMENT
46221 056/0448 00-065 NBTR NBTR NOOPS
46230 056/1911 00-067 NBTR NBTR NOOPS
46233 056/2333 00-068 OBC Clk Adj fr 20.6 to 0.00 msec/day
____________________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 25 February 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
PEAXTHERM6Z Y-HI PEM AXIS THERM 6Z TEMP 46211-18
HRPTSPBIMON Y-HI HRDI PB MONITOR 46211,15-18
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None to report this period.
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APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 25 February 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
46211 055/13:13 (24 Feb 00) from 0.00 to 20.6 msec/day
46233 056/23:33 (25 Feb 00) from 20.6 to 0.00 msec/day
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APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 25 February 2000
18 Feb 2000 - GMT Day 049 Beta = 9.4 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 -67.2/-89.6 -3.68/-4.94 +0.0/+0.0 16.0 0.000 0.0
2 +33.6/-22.4 +5.15/+3.87 +30.4/-13.6 25.1 1.030 20.2
3 +134.4/11.2 +3.87/+2.60 +29.6/-15.2 25.0 1.027 19.6
25 Feb 2000 - GMT Day 056 Beta = 35.2 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 -56.0/-89.6 -3.05/-4.31 +0.0/+0.0 16.0 0.000 0.0
2 +89.6/-5.6 +5.79/+4.83 +29.2/-15.2 25.1 1.028 22.5
3 +89.6/+0.0 +5.15/+3.87 +28.8/-16.4 25.1 1.026 22.2
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---------- ----------
no changes V/T 5
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 25 February 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-004 FOT 46142 050/2136 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
No new reports generated
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
No new reports generated
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
99-071 FOT 44398 299/1212 21512 TPF Not Receiv 512 PB
00-004 FOT see list Feb 00 14170 Generic Late Acq.
SEVNTFW00/08