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UARS WEEKLY STATUS REPORT - 4 May 2001
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SOLSTICE
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One operational anomaly occured this week that required SOLSTICE to be
re-booted on day 122. Investigation continues into the cause. 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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SUSIM began a major calibration on May 2. To ensure accurate solar
scans of its reference channels, closed loop solar pointing of the SSPP
was used. Lamp calibrations of these reference channels are/were then
performed. In addition, SUSIM performed its daily solar scans this
past week during periods of predicted UARS telemetry.
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ACRIM
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Nothing received.
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PEM
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PEM/AXIS was activated in its full power mode on April 30.
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).
PEM has examined its processed files of the rehost machine and has found
that no differences exist in the Level 1 and Level 2 output files which were
generated the rehost when the same input data was used on CDHF and CDHFB.
PEM is now confident that output generated by PEM 3.32, Jobs 1 & 2, on the
rehost system is valid and correct.
The PEM team is working on replacing the PEM:: machine with a DEC Alpha
machine to be called PEM2K::. Tests of the NRT data transfer from CDHF2::
through PEM2K:: to the unix computer running the PEM GSE software show no
difference between equivalent NRT files transferred from PEM::. Thus, NRT
data from CDHF2:: is captured correctly on PEM2K::. Tests of the NRT data
transfer from CDHFB:: were not successful from both PEM:: and PEM2K::.
Results of the test of NRT data transfers from the rehost computer were
successful for individual files which exist on CDHFB::. PEM will participate
in the NRT data flow to capture NRT data from CDHFB:: when specified by GSFC.
PEM has been working with GSFC on allowing commanding of the PEM
instrument by creating DAPs on the PEM2K machine and submitting them to the
CMS. PEM2K:: now is able to communicate with the CMS, but the CMS does
not recognize PEM2K:: as an authorized site for instrument daily activity
plan submission. PEM is waiting for a solution from GSFC.
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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HALOE was operating successfully with all engineering parameters within
nominal operating range when it was turned off May 3, 2001 for the solar
graze period. All science data products continue to be of excellent
quality. HALOE is scheduled to be powered on May 16, 2001.
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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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The MPG participated in the UARS Monthly Status Review
Meeting on 2 May 2001. Daily processing of instrument
Daily Activity Plans continues with no problems. The
instrument operations schedule is now complete
to 28 June 2001.
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CDHF
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DAAC DATA
---------
- CLAES (OUTPUT 9) data created in May, 1999 has been previewed in
preparation for sending to the DAAC. The list of May files has been
forwarded to CLAES for review and approval.
UARS CDHF REHOST
----------------
- Target date of May 25 has been requested to confirm "puts" to silo.
Once this is done we are able to go operational. We will review NRT user
access status on Rehost next week.
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FOT
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REPORTING PERIOD
This report covers 21 April 2001 (Orbit 52531, GMT Day 111) through 27 April
2001 (Orbit 52635, GMT Day 117).
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
ACRIM 112/0054 52546 Power ON
SUSIM 112/0316 52547 Power ON
SUSIM 112/1622 52556 Power ON complete
HALOE 113/2357 52575 Power ON (Part 1)
HALOE 114/0457 52578 Power ON (complete)
The beta angle ranged between the angles of 5.6 degrees to 31.6 degrees for
this report period. The beta angle is now increasing towards a maximum angle
of 74 degrees on 09 May 2001 (DOY 129).
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 1.5 and 1.6 degrees C. Additional battery performance data for each
battery on 20 April 2001 and 27 April 2001 are provided in Appendix D.
The clock error ranged from Ð12.4 to 10.4 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 = 17
¥ HALOE = 02
¥ SUSIM = 02
¥ ACRIM = 01
¥ 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: 00/316 - 2287.496493
· Transponder B: 01/087 - 2287.499152
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 01/067 show the observatory data loss to be 300 hours, 18
minutes, 29.768 seconds. This shows an increase of 15 minutes and 24.304
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 15 minutes and 24.304 seconds occurred over four (4) days:
1 minute and 6.384 seconds on Day 110 due to a Data Hit,
1 minute and 16.368 seconds on Day 111 due to a Data Hit.
10 minutes and 47.536 seconds on Day 112 with reason unknown.
2 minutes and 14.016 seconds on Day 112 with reason unknown.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The new flight software version 67 was successfully uplinked on 25 April 2001.
This patch increases the accuracy of the magnetic field model, accounts for the
one second delay between MAGMOD and UFLTR execution and properly calculates the
magnetic field model time. These enhancements should provide for more accurate
TAM measurements and increase the overall attitude precision.
After the uplink the FOT also switched from using TAM-2 to using TAM-1. The
switch was made due to the fact that TAM-1 is more orthogonal than TAM-2. The
TAM-1 alignment will be fine-tuned by loading new alignment matrices this week.
An accurate alignment is needed to get ready for the loss of sun in the field
of view of the FSS on 5 May 2001.
MEETINGS
The FOT attended a UARS Flight Code Review Meeting on Monday, April 23, 2001.
The FOT attended a Hazard Training Class on Wednesday, April 25, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 30 May 2001 (DOY 150). 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 27 April 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
52531 111/0136 01-253 OBC Clk Adj 0.0 to -20.6 msec/day
52546 112/0054 01-254 SOLSTICE From Day-Only to Fulltime Ops
52546 112/0054 01-255 ACRIM Power ON
52547 112/0316 01-256 SUSIM Power ON
52549 112/0640 01-257 OBC Clk Adj -20.6 to 0.0 msec/day
52553 112/258 01-258 PEM ZEPS & HEPS to Day-Only ops.
52556 112/1622 01-256 SUSIM Power ON complete
52572 113/1812 01-259 NBTR NOOPS D-114
52575 113/2357 01-261 HALOE Power ON (Part 1)
52578 114/0457 01-262 HALOE Power ON (complete)
52584 114/1337 01-259 NBTR NOOPS D-114
52587 114/1813 01-263 NBTR NOOPS D-115
52599 115/1439 01-264 OBC FSW ver# 67 update
52600 115/1518 01-265 OBC TAM 2 TO TAM 1
52601 115/1628 01-266 OBC TAM to Update Mode
52602 115/1815 01-267 ATC NOOPS D-116
52610 116/0756 01-267 NBTR NOOPS D-116
52616 116/1704 01-267 NBTR NOOPS D-116
52617 116/1816 01-268 NBTR NOOPS D-117
52623 117/0508 01-268 NBTR NOOPS D-117
52624 117/0616 01-268 NBTR NBTP PBK / RTS-58
52630 117/1522 01-269 OBC Clk Adj 0.00 to 20.6 msec/day
52631 117/1633 01-268 NBTR NOOPS D-117
52633 117/2038 01-270 NBTR NOOPS D-118
________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 27 April 2001
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
HRIFESURVTMP Y-HI HRDI PSE Quiet Bus Cur Mon 52611
HRRADTEMP Y-HI HRDI PSE Pulse Bus Cur Mon 52611
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 27 April 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
52531 111/0141 Clk Adj 0.0 to -20.6 msec/day
52549 112/0643 Clk Adj -20.6 to 0.0 msec/day
52630 117/1524 Clk Adj 0.00 to 20.6 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 27 April 2001
20 Apr 2001 - GMT Day 110 Beta = 01.4 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 +621.6/+280.0 -3.68/-4.94 +0.0/+0.0 12.3 0.000 0.0
2 +22.4/-67.2 +5.15/+3.87 +28.8/-12.8 25.1 1.020 20.5
3 +22.4/-67.2 +3.87/+2.60 +28.0/-12.8 25.0 1.020 20.0
27 Apr 2001 - GMT Day 117 Beta = 31.6 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 +11.2/-89.6 +6.11/+4.51 +28.8/-15.2 24.2 1.030 21.6
3 +22.4/-50.4 +5.15/+3.55 +28.8/-16.0 24.2 1.020 21.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
_____________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 27 April 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-020 FOT 52609 116/0615 N/A TPF Late ACQ on PBK
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-020 FOT 52609 116/0615 N/A TPF Late ACQ on PBK
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
------ ------ ----- ---- --- -----------------
01-019 FOT see list Apr 01 14170 Generic Late Acquisition
SEVNTFW01/16