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UARS WEEKLY STATUS REPORT - 21 APR 2000
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SOLSTICE
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We continue to gather enough data to meet all the SOLSTICE science
objectives during this period of reduced tape recorder operations.
SOLSTICE operates normally, collecting solar data on all available
orbital tracking periods and stellar calibration observations whenever
possible. Level 2 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 near normal set of daily solar scans
scheduled for periods of predicted telemetry.
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ACRIM
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Nothing received.
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PEM
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The PEM spectrometers continue to be active under PMON control*. At the
present time, PEM energy deposition 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. Updated HEPS calibration parameters were finalized and are ready for
delivery. Updated MEPS quality calibration files are being generated which are
used during Level 3 product generation. 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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Routine processing of instrument Daily Activity Plans continues with no
problems. The MPG continues to assist the Project Scientistwith the scheduling
of instrument operations.
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CDHF
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STATUS:
Level 0 UARS Day 3140 was reingested on 04/17/00 as version 3 (auto jobs
were put onhold) for better data quality.
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.
- All requested reprocessing is complete as of this reporting period.
UARS CDHF REHOST:
- Testing of level0 and NRT ingested data are being done by file compares
(old vs. new system, file header validation) as well as execution of
selected production processing jobs.
- Correlative data suppliers are being contacted and accounts set up.
-FDF is sending each day's ORBIT file to both current and rehost
system. ORBIT files for UARS Days 3131 - 3141 have been successfully
ingested.
-NOAA is sending each day's NMC Corr. files to both systems.
NMC Correlative files (T,Z,M,W) for UARS Day 3141 have been
successfully ingested.
THANKS Correlative Organizations for quick response to our requests.
- Successful processing on Rehost System:
Attitude Extraction, Observatory Log, Sensor Extraction, HALOE, MLS,
SUSIM, Solstice, and WINDII.
- Preparing to test ISAMS V12.0 and PEM V3.32 software on the
Rehost System.
- Draft of the REHOST Operations Work Instruction book finished.
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FOT
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REPORTING PERIOD
This report covers 08 April, 2000 (Orbit 46863, GMT Day 099) through 14 April
2000 (Orbit 46967, GMT Day 105).
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
-None this report period
The beta angle ranged between the angles of 49.2 degrees to 40.8 degrees for
this report period. The beta angle is now decreasing toward a minimum angle of
+1.0 degrees on 25 April 2000 (DOY 116).
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 0.6 to 1.0 degrees C. Additional battery performance data for each
battery on 07 April 2000 and 14 April 2000 are provided in Appendix D.
The clock error ranged from -12.9 to 12.1 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 = 03
% ALERTS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% FOT = 17
% HRDI = 02
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT = 04
Five (5) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
- Transponder A: 00/091 - 2287.496948
- Transponder B: 00/091 - 2287.499113
GROUND SYSTEM OPERATION
Four (4) 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 00/104 show the observatory data loss to be 301 hours, 19
minutes, 33.049 seconds (an increase of 6 minutes 59.536 seconds since the last
report period).
The increase of 6 minutes 59.536 seconds occurred over two (2) days:
- 06 minutes 08.968 seconds on Day 101 due to data hits,
- 00 minutes 50.568 seconds on Day 103 due to data hits.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
There were more problems encountered with the UTTS this week. Both the FOT and
its support staff are doing everything possible to correct these problems so
that the testing of the new safehold TMONs can begin.
The FOT also began developing an online procedure for safehold should it happen
before the new TMONs are in place or during and OBC halt. This procedure has
yet to be finalized and must undergo peer review before it will be ready.
MEETINGS
The FOT attended the UARS Flight Software CCB on 10 April 2000. The FSW team
now has the information necessary for them to begin work on the three TDRSS
implementation.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for April 25, 2000 (DOY 116). 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 14 April 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
46864 099/0200 00-152 OBC Clk Adj 20.6 TO 0.00 msec/day
46867 099/0659 00-151 NBTR NBTR OPS DOY 099
46874 099/1805 00-153 NBTR NBTR OPS DOY 100
46882 100/0700 00-153 NBTR NBTR OPS DOY 100
46889 100/1807 00-154 NBTR NBTR OPS DOY 101
46896 100/0607 00-155 OBC Clk Adj 0.00 to 20.6 msec/day
46904 101/1809 00-156 NBTR NBTR OPS DOY 102
46911 102/0613 00-156 NBTR NBTR OPS DOY 102
46919 102/1812 00-157 NBTR NBTR OPS DOY 103
46927 103/0707 00-157 NBTR NBTR OPS DOY 103
46926 103/0612 00-158 OBC Clk Adj 20.6 to 0.00 msec/day
46931 103/1408 00-159 HRDI HRDI MICROLOAD
46935 103/1911 00-160 NBTR NBTR OPS DOY 104
46942 104/0754 00-160 NBTR NBTR OPS DOY 104
46947 104/1553 00-161 HRDI REPLACE TEST MPLUS
46949 104/1816 00-162 NBTR NBTR OPS DOY 105
46957 105/0720 00-162 NBTR NBTR OPS DOY 105
46963 105/1651 00-164 OBC Clk Adj 0.00 to 20.6 msec/day
46964 105/1818 00-163 NBTR NBTR OPS DOY 106
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 14 April 2000
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
HATBAT Y-HI BOLOMETER AREA TEMP 46890-1
HRPSEQBIMON R-LO PSE Quiet Bus Current Mon 46947
HRPSEQBIMON Y-HI PSE Quiet Bus Current Mon 46955
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
-None this report period
__________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 14 April 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
46864 099/02:02 (08 Apr 00) from 20.6 to 0.00 msec/day
46896 101/06:07 (10 Apr 00) from 0.00 to 20.6 msec/day
46926 103/06:12 (12 Apr 00) from 20.6 to 0.00 msec/day
46963 105/16:51 (14 Apr 00) from 0.00 to 20.6 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 14 April 2000
07 April 2000 - GMT Day 098 Beta = 49.2 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 -33.6/-56.0 -3.05/-4.31 +0.0/+0.0 15.8 0.000 0.0
2 +56.0/-5.6 +5.47/+4.19 +26.4/-16.0 24.6 1.042 21.3
3 +22.4/-22.4 +4.51/+3.23 +26.0/-16.0 24.5 1.040 21.0
14 April 2000 - GMT Day 105 Beta = 40.8 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 -33.6/-50.4 -3.05/-4.31 +0.0/+0.0 15.8 0.000 0.0
2 +89.6/+0.0 +5.79/+4.51 +28.0/-15.2 24.5 1.040 20.9
3 +22.4/-44.8 +5.15/+3.55 +27.6/-15.2 24.5 1.038 20.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ----- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 14 April 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-007 FOT 46910 102/0348 14170 GENERIC LATE ACQ
00-011 FOT 46932 103/1550 N/A BLG 32 POWER OUTAGE
00-012 FOT 46932 103/1550 N/A STORED CMD ERROR
00-013 FOT 46946 104/1410 N/A TAC 4 CRASH
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-009 FOT 46813 095/1713 N/A No File Xfer Cap.
00-010 FOT 46827 096/1428 N/A No File Xfer Cap.
00-012 FOT 46932 103/1550 N/A STORED CMD ERROR
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
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
99-071 FOT 44398 299/1212 21512 TPF Not Receiv 512
00-007 FOT see list April 00 14170 Generic Late Acq.
00-011 FOT 46932 103/1550 N/A BLG 32 POWER OUTAGE
00-013 FOT 46946 104/1410 N/A TAC 4 CRASH
SEVNTFW00/15