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UARS WEEKLY STATUS REPORT - 29 JUN 2001
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SOLSTICE
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SOLSTICE began day only operations on day 178 (6/27) in support of the yaw
maneuver. We were subsequently turned offcompletely on day 179 due to low
power conditions during the yaw. We expect to return to normal operations
on day 182. 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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***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****
The PEM team reports that the PEM:: node computer has failed and has
been taken off line. PEM:: appears to have hardware problems that take the
system down every few hours. Automatic transfer NRT tests to PEM2K have
succeed however the NRT files have to be verified against those captured by
PEM to confirm the NRT process is correct.
PEM/AXIS was activated in its half power mode on June 24. 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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On 27 June 2001 the MPG participated in the UARS Monthly
Status Review Meeting. Normally, these meetings are
held on the first Wednesday of each month. Since the
first Wednesday of July is a holiday, this meeting was
moved to the last week of June. Daily processing of
instrument Daily Activity Plans continues with no problems.
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CDHF
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Following one week of parallel operations between the
UARS CHDF legacy system and the Rehost system that began on June 18, the
operational transition to production processing on the Rehost system
occurred on June 25. The NRT data flow remains on the legacy system and
will be moved to the Rehost system during the week of July 9. The NRT was
not moved earlier due to the planned yaw maneuver on June 28 and other test
activities and the holiday during the week of July 2.
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FOT
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REPORTING PERIOD
This report covers 16 June 2001 (Orbit 53371, GMT Day 167) through 22 June 2001
(Orbit 53475, GMT Day 173).
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
WINDII 169/0403 53403 Power OFF (S/C Low Power)
HALOE 172/1424 53454 Power OFF
HALOE 172/1745 53456 Power ON
SOLSTICE 172/1827 53457 Power ON
ACRIM 172/1827 53457 Power ON
SUSIM 172/1928 53457 Power ON
SUSIM 172/2145 53459 Power ON
HRDI 173/0225 53462 Power ON
The beta angle ranged between the angles of 32.8 degrees to 21.7 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 0 degrees on 28 June 2001 (DOY 179).
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 15 June 2001 and 22 June 2001 are provided in Appendix D.
The clock error ranged from Ð11.8 to 10.3 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 = 13
¥ 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
¥ WINDII = 01
¥ HALOE = 02
¥ SOLSTICE = 01
¥ ACRIM = 01
¥ SUSIM = 02
¥ HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 02
One (1) Anomaly Reports 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
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 01/158 show the observatory data loss to be 301 hours, 02
minutes, 12.728 seconds. This shows zero loss 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
The FOT continues to fine-tune the TAM alignment by loading new alignment
matrices. A new alignment is required for the reverse flight direction. This
is a slow process and it will take many alignments to lock in on the most
accurate solution.
An instrument anomaly was experienced 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. Analysis shows that the anomaly was caused due to failed circuitry in
the ACRIM electronics box. The FOT is awaiting a future plan of action from
the ACRIM team.
MEETINGS
The FOT attended a UARS SERB/TAC RS Meeting on Wednesday, June 20, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 28 June 2001 (DOY 179). 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 22 June 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
53373 167/0440 01-393 NBTR NOOPS D-167
53381 167/1742 01-393 NBTR NOOPS D-167
53382 167/1824 01-395 NBTR NOOPS D-168
53389 168/0540 01-395 NBTR NOOPS D-168
53396 168/1742 01-396 NBTR NOOPS D-169
53403 169/0403 01-397 WINDII Power OFF (S/C Low Power)
53404 169/0539 01-396 NBTR NOOPS D-169
53405 169/0720 01-398 OBC Clk Adj fr 0.00 to 20.6 msec/day
53411 169/1743 01-396 NBTR NOOPS D-169
53412 169/1825 01-399 NBTR NOOPS D-170
53419 170/0540 01-399 NBTR NOOPS D170
53421 170/0908 01-400 OBC Clk Adj fr 20.6 to 0.00 msec/day
53426 170/1743 01-399 NBTR NOOPS D170
53433 171/0443 01-401 NBTR NOOPS D171
53442 171/1826 01-402 NBTR NOOPS D172
53449 172/0626 01-402 NBTR NOOPS D172
53454 172/1424 01-403 HALOE Power OFF
53456 172/1745 01-405 HALOE Power ON
53457 172/1827 01-406 SOLSTICE Power ON
53457 172/1827 01-407 ACRIM Power ON
53457 172/1827 01-404 NBTR NOOPS D173
53457 172/1928 01-408 SUSIM Power ON
53459 172/2145 01-409 SUSIM Power ON
53462 173/0225 01-410 HRDI Power ON
53463 173/0445 01-411 OBC Clk Adj fr 0.0 to -20.6 msec/day
53464 173/0627 01-404 NBTR NOOPS D173
53472 173/1746 01-412 NBTR NOOPS D174
______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 22 June 2001
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
WIQBVOLTAGE Y-LO WINDII Quiet Bus Voltage 53373-6
HRPSEQBIMON Y-HI PSE Quiet Bus Current Monitor 53373-6
WIQBVOLTAGE Y-LO WINDII Quiet Bus Voltage 53387-90
HRPSEQBIMON Y-HI PSE Quiet Bus Current Monitor 53388-90
CDUNRG28 Y-LO +28 UNREG Bus 53388-90
WIQBVOLTAGE Y-LO WINDII Quiet Bus Voltage 53402-3
HRPSEQBIMON Y-HI PSE Quiet Bus Current Monitor 53402-3
PWLBV Y-LO Load Bus Voltage 53402-3
PWBAT3V Y-LO Battery 3 Voltage 53402-3
CDUNRG28 Y-LO +28 UNREG Bus 53402-3
PWLBV Y-LO Load Bus Voltage 53402-3
PWBAT2V Y-LO Battery 2 Voltage 53454
PWBAT3V Y-LO Battery 3 Voltage 53454
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 22 June 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
53405 169/0723 Clk Adj fr 0.00 to 20.6 msec/day
53421 170/0911 Clk Adj fr 20.6 to 0.00 msec/day
53463 173/0449 Clk Adj fr 0.0 to -20.6 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 22 June 2001
15 June 2001 - GMT Day 166 Beta = 33.4 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 +728.0/+728.0 -3.05/-4.31 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-78.4 +6.44/+4.51 +28.4/-15.2 23.8 1.030 20.2
3 +16.8/-89.6 +5.15/+3.55 +28.0/-15.2 23.8 1.020 19.9
22 June 2001 - GMT Day 173 Beta = 21.7 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/-112.0 +5.79/+4.51 +28.8/-14.4 24.5 1.040 20.8
3 +22.4/-56.0 +4.83/+3.23 +28.4/-14.4 24.3 1.040 20.5
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 08 June 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-032 FOT 53437 171/0947 14170 Generic Late Acquisition
01-038 FOT 53454 172/1424 N/A TMON 1, 2 TRIPPED
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-033 FOT 53222 157/0220 N/A CDEL function not working
01-034 FOT 53225 157/0754 N/A Unable to dump ATC
01-037 FOT 53292 161/1820 N/A Unable to load ATC
01-038 FOT 53454 172/1424 N/A TMON 1, 2 TRIPPED
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
------ ------ ----- ---- --- -----------------
01-032 FOT see list June 01 14170 Generic Late Acquisitio
SEVNTFW01/25