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UARS WEEKLY STATUS REPORT - 19 MAY 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. Level 2 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 near normal set of daily solar scans
scheduled for periods of predicted telemetry.
One day of data was missed this week due to a subtle commanding error.
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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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HALOE will be turned May 23, 2000 at beginning of day. HALOE has been off
during the full graze period. HALOE has been performing nominally when
operating.
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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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Routine processing of instrument Daily Activity Plans continues with no
problems.
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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 06 May, 2000 (Orbit 47283, GMT Day 127) through 12 May 2000
(Orbit 47387, GMT Day 133).
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 127/0006 47282 AXIS On
HALOE 129/2333 47327 Off
WINDII 130/0012 47327 On
WINDII 132/2343 47372 Off
HRDI 133/0859 47378 Low Pwr
PEM 133/2347 47387 AXIS Off
The beta angle ranged between the angles of 42.8 degrees to 69.3 degrees for
this report period. The beta angle is now increasing toward a maximum angle of
+76.0 degrees on 15 May 2000 (DOY 136).
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 05 May 2000 and 12 May 2000 are provided in Appendix D.
The clock error ranged from 17.5 to -10.2 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 = 03
% ALERTS = 03
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% FOT = 11
% PEM = 02
% WINDII = 02
% SSPP = 02
% HRDI = 01
% HALOE = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT = 03
Three (3) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
- Transponder A: 00/091 - 2287.496948
- Transponder B: 00/091 - 2287.499113
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 00/132 show the observatory data loss to be 295 hours, 38
minutes, 10.561 seconds (an increase of 0 minutes 0.00 seconds since the last
report period). This is a 0.40 percent data loss which equals a 99.60 percent
data capture for the mission.
These calculations have been recalculated to include 1999/346 through 2000/006
statistics using scheduled times.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
UARS experienced a small anomaly this week. The SSPP Failure Detection and
Correction (FDC) was activated and sent the SSPP to wait mode. This was due to
the pointing platform trying to track a star whose alpha and beta angles could
not be met. The problematic star was deleted from the ATC load and the SSPP
FDC was reset. The SSPP performed nominally after the fix was made.
The FOT performed numerous tests with the simulator to try to narrow down the
exact problem with loading the new TMONs. The FOT received help from Dick
Quinn and Dave Lorenz and are very close to getting to the root of the problem.
Once the TMONs are loaded to the simulator they will be thoroughly tested
before they are presented, approved and uplinked.
The FOT continues to develop an online procedure for safehold should it happen
before the new TMONs are in place or during and OBC halt. The NASA power
engineers were able to calculate the proper offset angle for this procedure.
This was the last calculation to be made so the procedure can now be finalized.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for June 05, 2000 (DOY 157). 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 12 May 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
47282 127/0006 00-198 PEM AXIS to 14w
47286 127/0519 00-197 NBTR NBTR NOOPS D127
47293 127/1645 00-197 NBTR NBTR NOOPS D127
47294 127/1906 00-199 NBTR NBTR NOOPS D128
47301 128/0627 00-199 NBTR NBTR NOOPS D128
47305 128/1209 00-200 OBC Clk Adj fr 0.00 to 20.6 msec/day
47309 128/1909 00-199 NBTR NBTR NOOPS D128
47309 128/1909 00-201 NBTR NBTR NOOPS D129
47316 129/0629 00-201 NBTR NBTR NOOPS D129
47327 129/2333 00-202 HALOE Power OFF
47327 130/0012 00-203 WINDII Power ON
47347 131/0715 00-204 SSPP NOOPed bad SSPP star track
47348 131/0856 00-205 SSPP SSPP NOOPs & Reset SSPP FDC
47351 131/1344 00-206 OBC Clk Adj fr 20.6 to 0.00 msec/day
47366 132/1330 00-207 OBC Clk Adj fr 0.00 to 20.6 msec/day
47369 132/1918 00-208 OBC Clk Adj fr 20.6 to 41.6 msec/day
47372 132/2343 00-209 WINDII Power OFF
47378 133/0859 00-210 HRDI HRDI SAFEHOLD
47387 133/2347 00-211 AXIS I&II Power OFF
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 12 May 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
WIISUTEMP Y-LO ISU TEMP 47289-91,95-6
WIISUTEMP Y-LO WINDII ISU TEMP 47305-09
WIISUTEMP Y-LO WINDII ISU TEMP 47320-25
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
SSFDCFAIL SSPP FDC tripped 47346-48
SSCMDERR SSPP COMMAND ERROR 47346-7
SSCMDERR SSPP COMMAND ERROR 47351
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 12 May 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
47305 128/12:19 (07 May 00) from 0.00 to 20.6 msec/day
47351 131/13:44 (10 May 00) from 20.6 to 0.00 msec/day
47366 132/13:34 (11 May 00) from 0.00 to 20.6 msec/day
47369 132/19:21 (11 May 00) from 20.6 to 41.6 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 12 May 2000
05 May 2000 - GMT Day 126 Beta = 42.8 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 -5.6/-33.6 -3.05/-4.62 +0.0/+0.0 15.8 0.000 0.0
2 +22.4/-50.4 +5.79/+4.51 +27.6/-16.0 24.5 1.030 20.9
3 +22.4/-33.6 +4.83/+3.23 +27.6/-16.0 24.5 1.028 20.7
12 May 2000 - GMT Day 133 Beta = 69.3 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 +0.0/-22.4 -2.73/-4.31 +0.0/+0.0 15.8 0.000 0.0
2 +16.8/-11.2 +3.23/+1.97 +18.4/-14.0 27.0 1.040 15.0
3 +16.8/-22.4 +2.60/+1.34 +17.6/-13.6 27.0 1.037 14.8
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ----- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 12 May 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-020 SSPP 47346 131/0633 N/A SSPP FDC tripped
00-007 FOT 47351 131/1326 14170 Generic Late Acq.
00-022 FOT 47369 132/1836 N/A AP 7 Crashed
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-020 SSPP 47346 131/0633 N/A SSPP FDC tripped
00-022 FOT 47369 132/1836 N/A AP 7 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
------ ------ ----- ---- --- -----------------
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
00-007 FOT see list May 00 14170 Generic Late Acq.
SEVNTFW00/19