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UARS WEEKLY STATUS REPORT - 15 SEP 2000
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Note: Due to the network problems experienced by Goddard Space Flight Center
on Friday September 15, 2000 the transmission of the "UARS Status Report"
was not possible. We apologize for the inconvenience.
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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 not affected by the larger than normal pointing errors
(2-4 arcminutes across a track) since they are within our calibrations.
Additionally, we continue to gather enough data to meet all the SOLSTICE
science objectives during this period of reduced tape recorder operations.
Level2 processing is halted due to bugs in the OA_SSPP_ATT service. CDHF
and CSC personnel are working on the problem.
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SUSIM
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SUSIM continues to gather a normal set of daily solar scans
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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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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Nothing received.
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MPG
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Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinate with the Flight
Operations Team and to assist the Project Scientist in the
scheduling of instrument operations.
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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 02 September 2000 (Orbit 49067, GMT Day 246) through 08
September 2000 (Orbit 49171, GMT Day 252).
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 250/2342 49141 POWER OFF AXIS 1,2
WINDI 251/0123 49141 POWER ON
The beta angle ranged between the angles of 48.3 degrees to 36.1 degrees for
this report period. The beta angle is now decreasing toward a minimum angle of
+0 degrees on 18 September 2000 (DOY 262).
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 to 0.8 degrees C. Additional battery performance data for each
battery on 01 September 2000 and 08 September 2000 are provided in Appendix D.
The clock error ranged from -12.3 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 = 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 = 44
¥ WINDII = 02
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:
· Transponder A: 00/153 - 2287.496961
· Transponder B: 00/213 - 2287.499288
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 00/251 show the observatory data loss to be 298 hours, 13
minutes, 25.960 seconds (an increase of 25.960 seconds since the last report
period). This is a 0.39 percent data loss which equals a 99.61 percent data
capture for the mission.
The increase of 25.960 seconds occurred over one (1) day:
· 25.960 seconds on Day 245 due to a data hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT continues to operate FHST-1 for approximately one orbit each day. By
cycling the tracker on and off for such a short duration the degradation seems
to have been reduced. Scale factor calibrations are being provided on a
regular basis from FDF and are being uplinked when received. It appears that
the FOT has been able to stabilize the performance of FHST-1 for now and
continues to work on establishing another viable attitude control solution
should the tracker fail.
MEETINGS
None this report period.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for September 17, 2000 (DOY 261). 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 08 Sept 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
49070 246/0612 00-456 NBTR NOOPS D246
49073 246/1127 00-456 NBTR NOOPS D246
49076 246/1636 00-422 FHST1 POWER ON
49077 246/1816 00-422 FHST1 POWER OFF
49077 246/1816 00-457 NBTR NOOPS D247
49084 247/0437 00-457 NBTR NOOPS D247
49086 247/0756 00-458 OBC Clk Adj 20.6 to 0.00 msec/day
49091 247/1538 00-422 FHST1 POWER ON
49091 247/1637 00-457 NBTR NOOPS D247
49092 247/1720 00-422 FHST1 POWER OFF
49092 247/1818 00-459 NBTR NOOPS D248
49100 248/0615 00-459 NBTR NOOPS D248
49106 248/1540 00-422 FHST1 POWER ON
49106 248/1639 00-459 NBTR NOOPS D248
49107 248/1721 00-422 FHST1 POWER OFF
49107 248/1820 00-460 NBTR NOOPS D249
49114 249/0439 00-460 NBTR NOOPS D249
49121 249/1542 00-422 FHST1 POWER ON
49121 249/1641 00-460 NBTR NOOPS D249
49122 249/1723 00-422 FHST1 POWER OFF
49123 249/1822 00-461 NBTR NOOPS D250
49124 249/2005 00-462 FHST1 SCALE FACTOR UPDATE
49128 250/0301 00-463 OBC Clk Adj 0.00 to 20.6 msec/day
49129 250/0521 00-461 NBTR NOOPS D250
49136 250/1544 00-422 FHST1 POWER ON
49136 250/1642 00-461 NBTR NOOPS D250
49137 250/1725 00-422 FHST1 POWER OFF
49138 250/1824 00-463 NBTR NOOPS D251
49138 250/1904 00-465 FHST1 SCALE FACTOR UPDATE
49139 250/2008 00-466 OBC TABLE 15 UPDATE
49141 250/2342 00-467 PEM POWER OFF AXIS 1,2
49141 251/0123 00-468 WINDII POWER ON
49144 251/0524 00-463 NBTR NOOPS D251
49147 251/0955 00-469 WINDII WINDII ERROR FIX
49151 251/1546 00-422 FHST1 POWER ON
49151 251/1546 00-470 OBC Clk Adj 20.6 to 0.00 msec/day
49151 251/1644 00-464 NBTR NOOPS D251
49153 251/1826 00-422 FHST1 POWER OFF
49153 251/1826 00-471 NBTR NOOPS D252
49159 252/0442 00-471 NBTR NOOPS D252
49159 252/0527 00-471 NBTR PLAYBACK
49166 252/1548 00-422 FHST1 POWER ON
49166 252/1646 00-471 NBTR NOOPS D252
49167 252/1728 00-422 FHST1 POWER OFF
49168 252/1828 00-472 NBTR NOOPS D253
49168 252/1905 00-473 FHST1 SCALE FACTOR UPDATE
49062 245/1814 00-456 NBTR NOOPS D-24
_________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 08 Sept 2000
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 08 Sept 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
49086 247/0756 (03 September) from 20.6 to 0.00 msec/day
49128 250/0301 (06 September) from 0.00 to 20.6 msec/day
49151 251/1612 (07 September) from 20.6 to 0.00 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 08 Sept 2000
01 Sept 2000 - GMT Day 245 Beta = 48.3 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 +728.0/+728.0 -3.05/-4.31 +0.0/+0.0 14.4 0.000 0.0
2 +44.8/-11.2 +5.15/+3.87 +26.0/-15.2 25.0 1.040 19.8
3 +22.4/-33.6 +4.19/+2.92 +25.6/-15.2 25.0 1.038 19.7
08 Aug 2000 - GMT Day 252 Beta = 36.1 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 -3.05/-4.31 +0.0/+0.0 14.4 0.000 0.0
2 +67.2/-16.8 +5.79/+4.51 +28.4/-15.2 24.3 1.040 21.5
3 +22.4/-56.0 +5.15/+3.87 +28.0/-16.0 24.2 1.038 21.0
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 08 Sept 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-041 OBC 49153 251/1826 14170 Generic Late Acq.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-037 FOT see list Aug 00 14170 Generic Late Acq.
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
------ ------ ----- ---- --- -----------------
00-041 FOT see list Sept 00 14170 Generic Late Acq.
00-040 FOT 48854 231/2111 22831 Data Dropout
00-032 FHST 48211 188/2242 N/A FHST 2 Anomaly
SEVNTFW00/36