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UARS WEEKLY STATUS REPORT - 01 DEC 2000
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SOLSTICE
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SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Our solar data is unaffected by the larger than normal pointing errors
since they are within our calibrations. Today (00336) we began day only
operations in support of the yaw manuever and will resume normal
operations in two days. Additionally, we continue to gather enough data to
meet all the SOLSTICE science objectives during this period of reduced tape
recorder operations.
In support of the OA_SSPP_ATT patch testing we are running our modified
processing code under RSS. We are processing the last year's worth of data
in this manner and expect to validate this patch in the next week.
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SUSIM
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SUSIM performed daily solar scans of the sun during periods
of predicted telemetry.
We are preparing to begin the reprocessing the SUSIM UV spectral
irradiances to data version V21 in the next few weeks.
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ACRIM
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Nothing received.
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PEM
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Nothing received.
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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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In order to conserve our human resources the WINDII team has decided
to cease WINDII operations for a few months in order to concentrate
on the analysis of recent data. Since we are now running without
active thermal control the WINDII operating temperature is about
8 C rather than the 20 C it was designed and calibrated for. Thus
we have had to recharacterize the instrument at this temperature,
in flight, and that has taken more effort than expected.
We plan to begin operations again after the TIMED launch, because
the opportunity for simultaneous measurements at different local
times with TIMED should be very rewarding.
WINDII has just completed a (major) infrequent calibration, and
will thus now go into standby until further notice.
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MPG
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Daily processing of instrument Daily Activity Plans continues
with no problems. The MPG continues to coordinate with the
Flight Operations Team and to assist the Project Scientist
with the scheduling of instrument operations. The latest
published instrument operations schedule is complete to 3 January
2001.
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CDHF
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 18 November 2000 (Orbit 50221, GMT Day 323) through 24
November 2000 (Orbit 50325, GMT Day 329).
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
PEM 324/2325 50250 Off
HALOE 325/0212 50252 On
The beta angle ranged between the angles of 56.5 degrees to 32.8 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 2 degrees on 3 December 2000 (DOY 337).
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 1.3 and 1.2 degrees C respectively. Additional battery performance data
for each battery on 17 November 2000 and 24 November 2000 are provided in
Appendix D.
The clock error ranged from Ð11.7 to 10.3 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 = 01
¥ ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
¥ FOT = 23
¥ HALOE = 03
¥ PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 01
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/221 - 2287.496937
· Transponder B: 00/305 - 2287.499087
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 00/328 show the observatory data loss to be 299 hours, 58
minutes, 58.600 seconds. This shows an overall decrease of 1 hour, 7 minutes
and 53.016 seconds since the last report period due to an apparent data
recovery from the previous week. This is a 0.39 percent data loss, which
equals a 99.61 percent data capture for the mission.
The increase of 3 minutes and 53.736 seconds occurred over three (3) days:
· 1 minute, 37.504 seconds on Day 322 due to a data hit
· 0 minutes, 05.168 seconds on Day 323 due to a data hit
· 2 minutes, 11.064 seconds on Day 325 due to a data hit
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
Testing continues daily to get the TAM and FSS attitude control solution
operational. The UARS testing and training simulator (UTTS) is being used for
all testing. In order to insure the validity of the test the FOT has been
debugging some problems with the simulator attitude models.
MEETINGS
The FOT attended the UARS Flight Software CCB on 20 November 2000.
The FOT attended a biweekly UARS Attitude meeting on 21 November 2000.
FUTURE SIGNIFICANT EVENTS
The FOT will put the TAM into monitor mode on 28 November 2000. This will
allow for the FOT to observe the TAM's performance and make any adjustments
before using the TAM as an input to the update filter.
The next UARS Yaw slew is scheduled for December 02, 2000 (DOY 337). This
maneuver will be a Reverse to Forward 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 24 November 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
50232 323/1813 00-651 NBTR NOOPS D-324
50237 324/0249 00-652 OBC Clk Adj 20.6 to 0.00 msec/day
50239 324/0528 00-651 NBTR NOOPS D-324
50247 324/1733 00-651 NBTR NOOPS D-324
50247 324/1814 00-653 NBTR NOOPS D-325
50250 324/2325 00-654 PEM AXIS POWER OFF
50252 325/0212 00-655 HALOE Power ON
50254 325/0530 00-653 NBTR NOOPS D-325
50262 325/1734 00-653 NBTR NOOPS D-325
50262 325/1814 00-656 NBTR NOOPS D-326
50265 325/2329 00-657 OBC Clk Adj 0.00 to 20.6 msec/day
50268 326/0435 00-656 NBTR NOOPS D-326
50275 326/1554 00-656 NBTR NOOPS D-326
50278 326/1922 00-659 NBTR NOOPS D-327
50283 327/0437 00-659 NBTR NOOPS D-327
50284 327/0534 00-659 NBTR PLAYBACK
50287 327/1051 00-659 NBTR PLAYBACK (FDF)
50288 327/1131 00-660 OBC Clk Adj 20.6 to 0.00 msec/day
50289 327/1415 00-659 NBTR NOOPS D-327
50292 327/1815 00-661 NBTR NOOPS D-328
50298 328/0438 00-661 NBTR NOOPS D-328
50304 328/1416 00-661 NBTR NOOPS D-328
50307 328/1817 00-662 NBTR NOOPS D-329
50317 329/1054 00-663 HALOE CLEAR CONTROL STATUS WORD 4
50318 329/1237 00-664 HALOE RELOAD BORESIGHT VALUES
50321 329/1559 00-662 NBTR NOOPS D-329
50323 329/1932 00-665 NBTR NOOPS D-330
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 24 November 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
HACS4 Y-HI HALOE CONTROL STATUS WORD 4 50317
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 24 November 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
50237 324/025200 Clk Adj from 20.6 to 0.00 msec/day
50265 325/233300 Clk Adj from 0.00 to 20.6 msec/day
50288 327/113230 Clk Adj from 20.6 to 0.00 msec/day
__________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 24 Nov 2000
17 Nov 2000 - GMT Day 322 Beta = 60.8 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 +728.0/+728.0 -3.05/-4.31 +0.0/+0.0 14.2 0.000 0.0
2 +11.2/-22.4 +3.87/+2.60 +23.2/-14.4 26.7 1.030 16.8
3 +11.2/-33.6 +2.60/+1.66 +24.4/-13.6 26.7 1.020 16.4
24 Nov 2000 - GMT Day 329 Beta = 32.8 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 +728.0/+728.0 -3.05/-4.62 +0.0/+0.0 14.2 0.000 0.0
2 +11.2/-56.0 +5.79/+4.51 +29.6/-15.2 25.1 1.030 21.1
3 +28.0/-33.6 +4.51/+3.23 +30.4/-16.0 25.0 1.030 20.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ----------
-no changes V/T 5
_________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 November 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-054 FOT 50280 326/2147 23187 RESET PTP /2:39 32K
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
------ ------ ----- ---- --- -----------------
00-047 FOT see list Nov 00 14170 Generic Late Acquisition
00-053 FOT 50168 319/1113 23157 Late Acquisition
00-054 FOT 50280 326/2147 23187 RESET PTP /2:39 32K
SEVNTFW00/47