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UARS WEEKLY STATUS REPORT - 10 AUG 2001
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SOLSTICE
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SOLSTICE began a period of day only operations this week (Aug) insupport of
the yaw maneuver. We expect to return to normal operations at the end of
today (Aug 10) Otherwise, 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.
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SUSIM
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On first examination, our lamp calibrations and reference channel scans
were performed successfully. There was time for 3 of our 4 lamps.
Because additional experiment time was made available until Aug. 27,
we will be able to get the scan of the 4th lamp, completing our "end
of mission" calibration. Additionally, SUSIM has completed its daily
solar scans this past week during periods of predicted UARS telemetry.
We have begun CDHF reprocessing hoping to finish before Oct. 1. At the
present rate, it won't be completed.
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ACRIM
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Nothing received.
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PEM
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***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****
PEM/AXIS was activated in activated in full power mode on July 27 and
deactivated on August 4. At the current time, AXIS is not generating energy
deposition. SwRI is looking into this. Tests of AXIS production code on the
rehost computer are continuing.
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).
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.
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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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Daily 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 28 July 2001 (Orbit 54001, GMT Day 209) through 03 August
2001 (Orbit 54105, GMT Day 215).
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 49.9 degrees to 24.4 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 2.0 degrees on 8 August 2001 (DOY 220).
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 to 1.6 degrees C. Additional battery performance data for each
battery on 27 July 2001 and 03 August 2001 are provided in Appendix D.
The clock error ranged from Ð11.5 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 = 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 = 12
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: 00/316 - 2287.496493
· Transponder B: 01/119 - 2287.499116
GROUND SYSTEM OPERATION
One (1) 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 01/207 show the observatory data loss to be 302 hours, 55
minutes, 48.256 seconds. This shows a loss of zero 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.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
UARS continues under the direction of no funding for science after 30 September
2001. In order to prepare for possible deorbit maneuvers, UARS will prime the
propulsion system starting next week. The A-C attitude thrusters will be fired
on Tuesday 07 August 2001, followed by B-D translation burns on both 08 and 09
August 2001. The translation burns will take place after Wednesday yaw
maneuver and will be approximately 4 and 13 seconds in duration. All
instruments will be asked to verify proper configuration before burns will be
executed.
MEETINGS
The UARS FOT attended a UARS EOM Planning Meeting on Tuesday, July 31,2001.
The UARS FOT attended a UARS Monthly Status Meeting on Wednesday, August
01,2001.
The UARS FOT attended a 3 TDRS Meeting on Wednesday, August 01,2001.
The UARS FOT attended a Safehold Working Group Meeting on Thursday, August 02,
2001.
The UARS FOT attended a Ground Rehost Demo Meeting on Thursday, August 02,
2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 08 August 2001 (DOY 220). This
maneuver will be a Forward to Reverse 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 03 August 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
54012 209/1811 01-479 NBTR NOOPS D210
54024 210/1352 01-480 OBC Clk Adj fr 0.00 to 20.6 msec/day
54027 210/1812 01-481 NBTR NOOPS D211
54042 211/1814 01-482 NBTR NOOPS D212
54043 211/2035 01-483 OBC Clk Adj fr 20.6 to 0.00 msec/day
54057 212/1816 01-484 NBTR NOOPS D213
54072 213/1817 01-485 NBTR NOOPS D214
54086 214/1714 01-485 NBTR NOOPS D214
54087 214/1820 01-486 NBTR NOOPS D215
54095 215/0621 01-486 NBTR NOOPS D-215
54101 215/1715 01-486 NBTR NOOPS D-215
54102 215/1822 01-487 NBTR NOOPS D-216
______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 03 August 2
ATE 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 03 August 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
54024 210/1354 Clk Adj fr 0.00 to 20.6 msec/day
54043 211/2038 Clk Adj fr 20.6 to 0.00 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 03 August 2001
27 July 2001 - GMT Day 208 Beta = 54.1 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 -3.68/-4.94 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-67.2 +4.51/+3.23 +24.8/-15.2 25.0 1.050 17.9
3 +22.4/-44.8 +3.55/+2.29 +24.0/-14.4 24.8 1.050 17.0
03 August 2001 - GMT Day 215 Beta = 54.1 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 12.0 0.000 0.0
2 +16.8/-78.4 +6.11/+4.51 +29.2/-14.4 24.2 1.030 21.4
3 +22.4/-50.4 +5.15/+3.87 +28.8/-14.4 24.2 1.020 21.1
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 03 August 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-046 FOT 54099 215/1312 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-041 FOT see list July 01 14170 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
01-045 FOT see list August 01 14170 Generic Late Acquisition
SEVNTFW01/30