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UARS WEEKLY STATUS REPORT - 18 MAY 2001
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SOLSTICE
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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 performed its daily solar scans for 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 May 16. 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).
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 process DAPs submitted from PEM2K::. 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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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. The instrument operations
schedule for the period 30 May to 28 June has been
revised to include WINDII observations 15-20 June.
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CDHF
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STATUS
The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
(C) = Complete, (F)= Failed (L) = Days remaining to reprocess.
***LEVEL0 for UARS DAYS 3514 and 3515 re-ingested with
additional data on current system.
2 days HALOE V4.82 (PROD) (3514, 3515) (2R-2C=0L)
3 days PEM V3.32 (PROD) (3513,3514,3515) (3R-3C=0L)
2 days SUSIM V7.2 (PROD) (3514, 3515) (2R-2C=0L)
DAAC DATA:
- Data received and cataloged in the month of March 2001 has been previewed
in preparation for sending to the DAAC for HALOE, NMC, and UKMO.
UARS CDHF REHOST:
- NRT/access test conducted this week. Participants successful.
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FOT
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REPORTING PERIOD
This report covers 05 May 2001 (Orbit 52740, GMT Day 125) through 11 May 2001
(Orbit 52845, GMT Day 131).
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 52770 Power Off AXIS
PEM 127/0006 52770 Power On HEPS/ZEPS
ACRIM 129/0342 52803 Power On
ACRIM 130/1908 52827 Quiet Bus B Off/ A On
ACRIM 130/2048 52828 Quiet Bus A Off/ B On
The beta angle ranged between the angles of 64.6 degrees to 72.9 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 34 degrees on 18 June 2001 (DOY 165).
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 1.2 to 1.3 degrees C. Additional battery performance data for each
battery on 4 May 2001 and 11 May 2001 are provided in Appendix D.
The clock error ranged from Ð11.5 to 12.2 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 = 08
¥ ACRIM = 04
¥ PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 03
Four (4) 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
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, 23
minutes, 12.216 seconds. This shows an increase of 0.864 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 0.864 seconds occurred over one (1) day:
· 1 minute and 0.864 seconds on Day 130 due to a Data Hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The new flight software patch uplinked on 25 April 2001 continues to be
monitored this week. The FOT is pleased with its overall performance and is
fine-tuning the TAM alignment by loading new alignment matrices. This is a
slow process and it will take many alignments to lock in on the most accurate
solution.
UARS is currently flying through its high beta period in which the FSS no
longer has view of the sun, thus relying solely on the TAM and gyros for
attitude control. The sun should be back in the field of view on 14 May 2001.
An instrument anomaly was experience on 05 May 2001. The instrument involved
was the ACRIM II instrument. All ACRIM telemetry for currents and voltages all
dropped to zero values suddenly. The ACRIM team in coordination with the
UARSFOT is conducting analysis and command tests to determine the cause of the
anomaly. The reason for the anomaly is currently unknown.
MEETINGS
The FOT attended a UARS FOT Meeting on Monday, May 07, 2001.
The FOT attended a UARS TAC RS Meeting on Wednesday, May 09, 2001.
The FOT attended a UARS Power Meeting on Thursday, May 10, 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 11 May 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
52743 125/0335 01-290 OBC Clk Adj 0.00 to 20.6 msec/day
52752 125/1904 01-291 OBC Clk Adj 20.6 to 41.2 msec/day
52770 127/0006 01-292 PEM Power ON HEPS/ZEPS POWER OFF AXIS
52777 127/1131 01-293 OBC Clk Adj 41.2 to 20.6 msec/day
52803 129/0342 01-294 ACRIM Power ON
52804 129/0624 01-295 OBC Clk Adj 20.6 to 41.2 msec/day
52810 129/1543 01-296 OBC TAM Residual Limit raised
52818 130/0344 01-294 ACRIM Change to Mode 7 then Mode 1
52827 130/1908 01-297 ACRIM Power Off / Power On Quiet Bus A
52828 130/2048 01-298 ACRIM QB A Power Off/ B ON
52840 131/1506 01-299 OBC Table 65 Load
52840 131/1546 01-300 OBC/CLK Clk Adj 41.2 to 20.6 msec/day
52840 131/1546 01-301 TAM TAM Alignment
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 11 May 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 11 May 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
52743 125/0332 Clk Adj 0.00 to 20.6 msec/day
52752 125/1908 Clk Adj 20.6 to 41.2 msec/day
52777 127/1134 Clk Adj 41.2 to 20.6 msec/day
52804 129/0626 Clk Adj 20.6 to 41.2 msec/day
52840 131/1551 Clk Adj 41.2 to 20.6 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 11 May 2001
4 May 2001 - GMT Day 124 Beta = 60.9 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/-4.62 +0.0/+0.0 11.8 0.000 0.0
2 +00.0/-33.6 +3.87/+2.60 +22.0/-15.2 26.4 1.060 16.8
3 +22.4/-22.4 +2.92/+1.66 +21.2/-15.2 26.4 1.050 16.4
11 May 2001 - GMT Day 131 Beta = 72.9 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 -2.42/-3.99 +0.0/+0.0 11.8 0.000 0.0
2 +00.0/-28.0 +3.23/+1.97 +16.8/-16.0 26.7 1.020 15.6
3 +16.8/-22.4 +2.60/+1.34 +16.0/-16.0 26.7 1.010 15.3
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---------- ----------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 04 May 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-024 ACRIM 52753 125/2045 N/A ACRIM Alerts - Power Off
01-025 FOT 52771 127/0118 14170 Generic Late Acquisition
01-025 FOT 52791 128/0946 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-019 FOT see list Apr 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
------ ------ ----- ---- --- -----------------
01-025 FOT see list May 01 14170 Generic Late Acquisition
01-021 SOLSTICE 52696 122/0142 N/A Det. OFF and Tubes volt. low
01-022 ACRIM 52709 122/2140 N/A Red Low voltage alert
01-024 ACRIM 52753 125/2045 N/A ACRIM Alerts - Power Off
SEVNTFW01/16