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UARS WEEKLY STATUS REPORT - 07 SEP 2001
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM has completed its daily solar scans this past week during
periods of predicted UARS telemetry.
As requested, we are verifying NRT files built on the PACOR-A system
versus the CDHF versions.
We are building our final calibrations to be used for reprocessing
the latest level 1 data to level 3 at NRL.
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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 is saddened by the shutdown of UARS and appreciates all of the
efforts of GSFC in the past and present of UARS.
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). Currently, PEM has requested GSFC assistance with compiling for
the DEC Alpha since the GSFC executables run on the Alpha and SwRI's compiled
versions do not.
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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The MPG participated in the UARS Monthly Status Review
Meeting on 05 September 2001.
On 06 September 2001 the MPG participated in the weekly UARS
Technical Team Meeting. This series of meetings is being
held to discuss contingencies since it appears that FY 2002
funds will be insufficient to continue collection of
science data by the UARS instruments.
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 25 August 2001 (Orbit 54421, GMT Day 237) through 31 August
2001 (Orbit 54525, GMT Day 243).
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
MLS 237/2224 54435 Power OFF
HALOE 238/0012 54436 Power ON
The beta angle ranged between the angles of 46.3 degrees to 39.6 degrees for
this report period. The beta angle is now decreasing towards a minimum angle
of 0 degrees on 11 September 2001 (DOY 254).
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 24 August 2001 and 31 August 2001 are provided in Appendix D.
The clock error ranged from Ð12.1 to 10.0 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 = 20
¥ HALOE = 01
¥ MLS = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 02
Zero (0) 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
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 01/242 show the observatory data loss to be 303 hours, 09
minutes, 13.504 seconds. This shows a loss of 15.808 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 15.808 seconds of data loss occurred over three (3) days:
· 27.840 seconds on Day 236 due to a Data Hit
· 22.208 seconds on Day 237 due to a Data Hit
· 09.760 seconds on Day 238 due to a Data Hit
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT continues to support and plan for the possible decommissioning of the
UARS spacecraft. A 3-minute calibration burn has been scheduled for 06
September 2001. The time of the burn has been set for 1310 GMT during the
1302-1327 GMT event. This burn should give the FOT and FDF a good handle on
the duty cycle and efficiency of the thrusters. All issues with FDF product
deliveries have been worked out and next TuesdayÕs products should include pre
and predicted post burn data.
MEETINGS
The UARS FOT attended a UARS Readiness Meeting on Monday, August 27, 2001.
The UARS FOT attended a UARS FDF Meeting on Monday, August 27, 2001.
The UARS FOT attended a UARS Technical Team Meeting on Thursday, August 30,
2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 11 September 2001 (DOY 254). 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 31 August 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
54435 237/2224 01-532 MLS Power OFF
54436 238/0012 01-533 HALOE Power ON
54438 238/0414 01-534 OBC Clk Adj fr 20.6 to 0.00 msec/day
54440 238/0654 01-535 NBTR D 238 NOOPS
54446 238/1716 01-535 NBTR D238 NOOPS
54447 238/1759 01-536 NBTR D239 NOOPS
54454 239/0557 01-536 NBTR D 239 NOOPS
54461 239/1716 01-536 NBTR D239 NOOPS
54462 239/1801 01-537 NBTR D240 NOOPS
54470 240/0656 01-537 NBTR D 240 NOOPS
54476 240/1620 01-538 OBC RELOAD RTS 1
54476 240/1717 01-537 NBTR D240 NOOPS
54478 240/1900 01-539 OBC Clk Adj fr 0.00 to 20.6 msec/day
54484 241/0559 01-540 NBTR Day 241 NOOPS
54492 241/1802 01-540 NBTR Day 241 NOOPS
54492 241/1802 01-541 NBTR Day 242 NOOPS
54498 242/0418 01-542 OBC Clk Adj fr 20.6 to 0.00 msec/day
54499 242/0600 01-541 NBTR Day 242 NOOPS
54506 242/1718 01-541 NBTR Day 242 NOOPS
54507 242/1802 01-543 NBTR Day 243 NOOPS
54515 243/0742 01-543 NBTR NOOPS D-243
54522 243/1802 01-544 NBTR NOOPS D-244
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 31 August 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 31 August 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
54438 238/0416 Clk Adj fr 20.6 to 0.00 msec/day
54478 240/1902 Clk Adj fr 0.00 to 20.6 msec/day
54498 242/0419 Clk Adj fr 20.6 to 0.00 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 31 August 2001
24 August 2001 - GMT Day 236 Beta = 45.9 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/-3.99 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-123.2 +5.15/+4.19 +26.0/-14.4 25.4 1.030 19.7
3 +22.4/-50.4 +4.51/+3.23 +25.6/-14.4 25.4 1.020 19.6
31 August 2001 - GMT Day 243 Beta = 39.6 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 -2.73/-3.99 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-89.6 +6.11/+4.83 +27.2/-15.2 24.2 1.030 21.4
3 +22.4/-56.0 +5.15/+3.87 +27.2/-15.2 24.0 1.020 21.1
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 August 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-052 FOT 54424 237/0555 14171 Generic Drop Out
01-053 FOT 54494 241/2100 24026 Late Acq (4:33)
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-045 FOT see list August 01 14170 Generic Late Acquisition
01-052 FOT 54424 237/0555 14171 Generic Drop Out
01-053 FOT 54494 241/2100 24026 Late Acq (4:33)
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
------ ------ ----- ---- --- -----------------
-None this report period
SEVNTFW01/33