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UARS WEEKLY STATUS REPORT - 29 SEP 2000
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SOLSTICE
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SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Our solar data is not affected by the larger than normal pointing errors
since they are within our calibrations.
Additionally, we continue to gather enough data to meet all the SOLSTICE
science objectives during this period of reduced tape recorder operations.
Level2 processing is halted due to bugs in the OA_SSPP_ATT service. CDHF
and CSC personnel are working on the problem.
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SUSIM
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SUSIM continues to gather a normal set of daily solar scans scheduled
for predicted periods of UARS telemetry.
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ACRIM
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ACRIM II data continue to be acquired on every possible opportunity. Data
quality looks good. Re-processing continues. Additional sensor comparisons
have been found that will enhance the precision of the long-term total
solar irradiance record.
Instrument appears to be in nominal operating condition. Instrument was
brought up in wrong shutter mode (mode 2) following last power-down because
of the use of an older start-up routine. That was shortly corrected to our
current monitoring modality (mode 1) through direct interaction between
ACRIM II personnel and the FOT.
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PEM
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Nothing received.
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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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WINDII is next scheduled to operate October 7 - 16. The Canadian
team members are leaving for a Joint Canada/France WINDII meeting
in Grasse, France, October 3-5, 2000.
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MPG
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The operations schedule for UARS instruments during the yaw
period from 22 October to 1 December was prepared and
distributed.
Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinate with the Flight
Operations Team and to assist the Project Scientist in the
scheduling of instrument operations.
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CDHF
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STATUS
- Data created in the month of July 2000 for HALOE, NMC, and UKMO has been
loaded into the DAAC Transfer Tables. DAAC has been notified.
- Waiting response from DAAC if MLS VERSION 5, UARS DAYS 118 - 121 that
reside in the DAAC Tables meet DAAC criteria. If so, the rest of
Version 5 will need transferred to the DAAC Tables and appropriate fields
updated.
- WINDII PI Software Representative has requested VERSION 11 be sent to the
DAAC from start of mission to 31-Aug-1997. WINDII has been notified to
update the QUALITY fields which are currently blank. The UARS_QUALITY
field is a DAAC requirement.
UARS CDHF REHOST:
- Successful processing on Rehost System:
Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, HRDI,
MLS, SUSIM, Solstice, WINDII and GPI.
Need Positive Response from all PI End Users prior to transition.
- SUSIM v7.2 software representative Ed Esfandiari notified parallel
testing completed. SUSIM responded with concerns regarding the output
product which is being investigated.
- HRDI v4.4 software representative Mr. Jim Raines was notified parallel
testing completed. HRDI responded and is still in process of validating
the output product.
- SOLSTICE v4.62 software representative PI Barry Knapp has successfully
validated the parallel testing output.
- HALOE v4.82 software representative Mr. Lance Deaver was notified the
parallel test days completed. HALOE responded and requested more time
to validate output product (possibly end of week).
- WINDII V5.11A software representative Mr. Brian Solheim requested parallel
processing on test days. The parallel processing is in progress.
- Gridding Software (GPI) V4.05. PC has successfully tested GPI against the
HRDI Level 3AL data. GPI Software Representative will need to validate
the output product.
- PEM Jobs 1, 2 will be excuted on Alpha on current system, then Rehost.
Alpha compliant JOBS 3, 4, 5 will be received with PEM patch delivery.
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FOT
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REPORTING PERIOD
This report covers 16 September 2000 (Orbit 49277, GMT Day 260) through 22
September 2000 (Orbit 49380, GMT Day 266).
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 260-1519 49286 Off
SUSIM 260-1519 49286 Off
SUSIM 263/1147 49328 On
ACRIM 263/1732 49332 On
PEM 264/2030 49349 AXIS On
HALOE 266/2256 49380 On
A Reverse-to-Forward Yaw Around maneuver (number 92) was successfully executed
in Orbit 49299 beginning 261/13:23:55 and completing at 261/14:01:05 on 17
September 2000. The SOLSTICE instrument was in day only and all other
intruments were in their off or standby mode (including HRDI and PEM). Due to
the SA position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 53.68 minutes. Post maneuver analysis of
data indicate that during the Yaw Around, the end-of-night load bus voltage was
24.92 volts and the average depths of discharge (DODs) on Batteries 2 and 3
were approximately 21.50 and 20.90 percent respectively. The next (forward-to-
reverse) YAW is scheduled for 23 October 2000 (DOY 297).
The beta angle ranged between the angles of 6.6 degrees to 17.2 degrees for
this report period. The beta angle is now increasing toward a maximum angle
of +52 degrees on 06 October 2000 (DOY 280).
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 1.0 to 1.6 degrees C. Additional battery performance data for each
battery on 16 September 2000 and 22 September 2000 are provided in Appendix D.
The clock error ranged from -12.4 to 11.5 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 = 21
¥ SUSIM = 02
¥ ACRIM = 02
¥ HALOE = 01
¥ PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 01
Three (3) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/221 - 2287.496937
· Transponder B: 00/244 - 2287.499127
GROUND SYSTEM OPERATION
One (1) operational support problem 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 00/265 show the observatory data loss to be 298 hours, 24
minutes, 10.017 seconds (an increase of 7 minutes 53.320 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 7 minutes 53.320 seconds occurred over six (6) days:
· 3 minutes 30.752 seconds on Day 253 due to an early LOS,
· 1 minute 5.304 seconds on Day 254 due to data hits,
· 2 minutes 1.376 seconds on Day 255 due to a late acquistion,
· 0 minutes 10.944 seconds on Day 256 due to a data hit,
· 0 minutes 52.960 seconds on Day 257 due to data hits,
· 0 minutes 11.984 seconds on Day 257 due to data hits.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT has now begun to operate the FHST-1 every other day. This was changed
from daily operations due to the accelerated degredation of the tracker. Scale
factor calibrations are being provided on a regular basis from FDF and are
being uplinked when received. The FOT continues to work on establishing
another viable attitude control solution should the tracker fail.
MEETINGS
The FOT attended a meeting to discuss FHST-1 on 19, 20 and 22 September 2000.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for October 23, 2000 (DOY 297). 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 22 Sept 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
49286 260/1519 00-487 ACRIM Power OFF
49286 260/1519 00-488 SUSIM Power OFF
49286 260/1559 00-422 MACS ST-1 ON
49298 261/1200 00-489 FHST-1 Power ON
49299 261/1242 00-490 MACS YAW MANUEVER
49301 261/1653 00-489 FHST-F1 Power OFF
49317 262/1657 00-491 OBC GENASCII/TAM
49319 262/2027 00-492 MACS FHST-1
49319 262/2104 00-493 OBC GENASCII/TAM
49328 263/1147 00-495 SUSIM Power ON
49331 263/1550 00-422 MACS ST-1 ON
49331 263/1550 00-494 OBC Clk Adj fr 0.00 to -20.6 msec/day
49332 263/1732 00-496 ACRIM Power ON
49333 263/1847 00-497 MACS ST-2 ON/OFF
49334 263/2029 00-422 MACS ST-1 OFF
49347 264/1738 00-498 OBC Clk Adj -20.6 to 0.00 msec/day
49349 264/2030 00-499 PEM AXIS I & II Power ON
49360 265/1518 00-501 MACS ST-1 ON
49360 265/1518 00-502 MACS UFLTR
49361 265/1553 00-503 MACS UFLTR
49362 265/1707 00-504 MACS ST-1 CAL
49362 265/1741 00-422 MACS ST-1 OFF
49364 265/2112 00-505 OBC Clk Adj fr 0.00 to 20.6 msec/day
49378 266/1853 00-506 NBTR NOOPS D267
49378 266/1853 00-507 FHST1 SCALE FACTOR UPDATE
49379 266/2033 00-508 OBC Clk Adj fr 20.6 to 0.00 msec/day
49380 266/2256 00-509 HALOE Power ON
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 22 Sept 2000
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 22 Sept 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
49331 263/1550 (19 September) from 0.00 to -20.6 msec/day
49347 264/1744 (20 September) from -20.6 to 0.00 msec/day
49364 265/2115 (21 September) from 0.00 to 20.6 msec/day
49379 266/2054 (22 September) from 20.6 to 0.00 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 22 Sept 2000
15 Sept 2000 - GMT Day 259 Beta = 11.5 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 14.4 0.000 0.0
2 +44.8/-11.2 +5.15/+3.87 +26.0/-15.2 25.0 1.040 19.8
3 +22.4/-33.6 +4.19/+2.92 +25.6/-15.2 25.0 1.038 19.7
22 Aug 2000 - GMT Day 266 Beta = 17.2 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 -3.68/-4.62 +0.0/+0.0 14.4 0.000 0.0
2 +22.4/-5.6 +4.51/+3.55 +29.2/-14.4 26.2 1.030 19.7
3 +22.4/-22.4 +3.87/+2.60 +28.4/-13.6 24.3 1.020 19.3
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---------- ----------
no changes V/T 5
______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 22 Sept 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-041 FOT 49310 262/0643 14170 Generic Late Acq.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
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
------ ------ ----- ---- --- -----------------
00-041 FOT see list Sept 00 14170 Generic Late Acq.
00-040 FOT 48854 231/2111 22831 Data Dropout
00-032 FHST 48211 188/2242 N/A FHST 2 Anomaly
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