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UARS WEEKLY STATUS REPORT - 20 APR 2001
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SOLSTICE
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SOLSTICE began day only operations on day 109 this week in support of the
yaw maneuver. We'll be returning to normal operations at the beginning of
day 112. 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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Nothing received.
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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 1 and deactivated
on April 9. 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. So far, this has not been achieved. It was discovered that PEM2K is
running Openwindows version 7.2-1 which operates differently across the
network than Openwindows version 7.1-2 (the CDHFB operating system). Compaq
is investigating to determine a solution. In the mean time, Steve Bove made
some suggestions which seem to have improved the PEM2K:: to UCMS:: image
execution ability; however, the CMS has had troubles recently and it appears
that the UCMS:: definitions for PEM2K:: must not be correct on the UCMS:: node.
PEM is waiting on a reply back 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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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. Instrument operations schedule is now complete
to 30 May 2001.
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CDHF
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CURRENT SYSTEM
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The CDHF and CDHF REHOST will be unavailable from April 22 9:30 GMT until
power up time at 11:30 GMT (tentative) April 23. This is due to a scheduled
building power outage.
This information is contained in the Login Notice as well as a telephone outage
schedule.
CLAES has requested Version 7 (Output 9) excluding Subtypes 3AL, 3AT (H20,
NO2B7, NU3VT626, O3B7, O3B8, ALT) are to be transferred to the DAAC.
Plans are to start previewing and loading data into the DAAC Transfer
Tables.
Data created in the month of February 2001 has been previewed for HALOE,
NMC, and UKMO in preparation for sending to the DAAC.
UARS CDHF REHOST
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Validating a mandatory upgrade of the HSM. This is the software that "Puts"
and Gets" data from the Silo.
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FOT
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REPORTING PERIOD
This report covers 07 April 2001 (Orbit 52321, GMT Day 097) through 13 April
2001 (Orbit 52425, GMT Day 103).
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 100/2345 52365 Power OFF AXIS
The beta angle ranged between the angles of -45.9 degrees to -27.8 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 1.3 and 1.6 degrees C. Additional battery performance data for each
battery on 06 April 2001 and 13 April 2001 are provided in Appendix D.
The clock error ranged from ~11.6 to 9.4 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 = 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 = 19
¥ PEM/AXIS = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 03
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
Three (3) 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, 1
minute, 12.760 seconds. This shows no change 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 is using both the Fine Sun Sensor (FSS) and the Three Axis Magnetometer
(TAM) as inputs to UFLTR this week. The FOT is pleased with their performance,
but continues to make adjustments to the TAM alignment to improve its
performance and UARS's attitude.
The FOT awaits the completion of the FSW patch that will improve the magnetic
field model from a 5th order to 7th order solution. The patch is currently
being tested on the UARS Testing and Training Simulator (UTTS). Testing should
be completed in the next few weeks.
MEETINGS
There were no meetings during this time period.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 19 April 2001 (DOY 109). 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 13 April 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
52325 097/0819 01-217 NBTR NOOPS D-097
52331 097/1757 01-218 NBTR NOOPS D-098
52334 097/2156 01-219 OBC Clk Adj 20.6 to 0.00 msec/day
52340 098/0736 01-218 NBTR NOOPS D-098
52346 098/1758 01-220 NBTR NOOPS D-099
52355 099/0737 01-220 NBTR NOOPS D-099
52360 099/1521 01-221 TAM TAM Alignment
52361 099/1702 01-222 TAM MAGMOD Update
52362 099/1759 01-223 NBTR NOOPS D-100
52365 100/2345 01-224 PEM Power OFF AXIS
52369 100/0642 01-223 NBTR NOOPS D-100
52377 100/1800 01-225 NBTR NOOPS D-101
52385 101/0742 01-225 NBTR NOOPS D-101
52389 101/1441 01-227 OBC CMDTST Scheduler Adjust
52392 101/1801 01-228 NBTR NOOPS D-102
52399 102/0643 01-228 NBTR NOOPS D-102
52405 102/1621 01-229 OBC Clk Adj 20.6 to 0.00 msec/day
52407 102/1803 01-230 NBTR NOOPS D-103
52414 103/0600 01-230 NBTR NOOPS D-103
52422 103/1804 01-231 NBTR NOOPS D-104
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 13 April 2001
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 13 April 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
52334 097/2159 Clk Adj 20.6 to 0.00 msec/day
52405 102/1625 Clk Adj 20.6 to 0.00 msec/day
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APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 13 April 2001
06 Apr 2001 - GMT Day 096 Beta = 48.1 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 +044.8/+022.4 -3.68/-4.62 +0.0/+0.0 13.0 0.000 0.0
2 +22.4/-44.8 +5.15/+3.87 +26.4/-15.2 25.0 1.050 19.7
3 +22.4/-33.6 +3.87/+2.60 +25.6/-15.2 25.0 1.040 19.5
13 Apr 2001 - GMT Day 103 Beta = 27.8 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 +067.2/+044.8 -3.05/-4.31 +0.0/+0.0 13.0 0.000 0.0
2 +11.2/-100.8 +6.44/+5.15 +29.6/-15.6 24.0 1.040 21.8
3 +22.4/-67.2 +5.47/+3.87 +28.8/-16.0 23.8 1.030 21.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
____________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 13 April 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-019 FOT 52363 099/1942 14170 Generic Late Acquisition
01-021 FOT 52383 101/0417 23834 TPF not receiving PBK
01-022 FOT 52398 102/0417 23836 TPF did not get 512k PBK
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-021 FOT 52383 101/0417 23834 TPF not receiving PBK
01-022 FOT 52398 102/0417 23836 TPF did not get 512k 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
SEVNTFW01/15