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UARS WEEKLY STATUS REPORT - 31 OCTOBER 1997
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SOLSTICE
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SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.
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SUSIM
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SUSIM was successfully repowered on October 27. Since then, it has
gathered its normal solar data without apparent problems.
The SUSIM team would like to thank Barbara Holt for her diligent and
kindly efforts on behalf of the UARS project. We will miss her.
Best of luck, Barb!
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PEM
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Nothing received.
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HALOE
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HALOE was successfully operating when is was powered off end-of-day October
30, 1997. All engineering parameters were within nominal operating range
and the science data products continue to be of excellent quality.
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MLS
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MLS was reactivated successfully on Oct 20, in the reduced 85 watt power
mode. Full vertical scans were performed Oct 21 thru Oct 25. MLS was powered
off on Oct 25 at 23:12 UT. MLS is scheduled to resume south viewing
operations on Oct 31.
Software for producing the new MLS upper tropospheric humidity product has
been delivered to the CDHF, and is now undergoing final tests before being
put into production. Humidity is retrieved at UARS pressure surfaces of 147,
215, 316 and 464 hPa.
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HRDI
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HRDI is functioning normally, and is planned to be in operation thru the
end of Oct. 30.
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WINDII
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WINDII is currently off. Initiation of the production under our
new Version 5 has been delayed by a number of details that have
required attention, but nearly all have been resolved now, and
implementation is expected within a few weeks.
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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
Scientist with the scheduling of instrument operations.
Personnel change: Barb Holt is leaving the UARS Mission
Planning Group to move to a position with Applied Physics
Laboratory.
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CDHF
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The CDHF received 339 CD-ROM requests as of 31-October-1997.
Two new CD-ROM orders were received this week.
The CDHF has completed the reprocessing of Extracted Attitude to generate
new SSPP files.
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.
25 days PEM (3.32) Prod (1350R-510C=840L)
29 days ATT (6.1) Prod (1321R-1321C=0L)
MLS (4.9) Engineering in progress
The CDHF has completed the preview and load of August 1997 current day
data to the DAAC.
Pending CDHF software upgrades include IDL 5.0, and OpenIngres 2.0.
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FOT
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REPORTING PERIOD
This report covers the 17 October 1997 (Orbit 33338, GMT Day 290).through 24
October 1997 (Orbit 33443, GMT Day 298).
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
HRDI 292/2321 33368 Off
ACRIM 292/2321 33368 Off
SUSIM 292/2321 33368 Off
MLS 293/1810 33380 Start Activation
MLS 293/2129 33382 Activation Complete
The beta angle reached a maximum angle of 46 degrees on 21 October 1997 (DOY
294). The beta angle is now decreasing toward a minimum angle of 0 degrees on
07 November 1997 (DOY 311).
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 24.5 end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and Battery
3 of 1.1 degrees C. Additional battery performance data for each battery on 18
October 1997 and 24 October 1997 are provided in Appendix D.
The clock error ranged from -10.2 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.
% ALERTS = 01
% OUT-OF-LIMITS = 15
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% FOT 04
% ACRIM/SUSIM 01
% HRDI 01
% MLS 01
% SUSIM/CH 03
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT 03
TRANSPONDER FREQUENCIES:
Transponder A: 97/287 - 2287.496931
Transponder B: 97/295 - 2287.499126
GROUND SYSTEM OPERATION
Three (3) operational support problem(s) 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 97/296 show the observatory data loss to be 20 hours, 41
minutes, 03.981 seconds (an increase of 5 minutes and 40.256 seconds). This is
a 0.0388 percent data loss which equals a 99.9612 percent data capture for the
mission.
The increase of 1.216 seconds occurred over four (4) days:
% 1.504 seconds on Day 290 due to insufficient overlap,
% 1 minute and 42.752 seconds on Day 291 due to insufficient overlap and
an unknown reason,
% 3 minutes and 48.192 seconds on Day 292 due to White Sands fail-over,
and
% 7.808 seconds on Day 294 due to data not recorded.
FOT level-0 processing software was tested on the Central Data Handling
Facility (CDHF) using files generated by the new Level Zero (LZPR). The LZPR
files were processed successfully.
Verified functionality of File Transfer Protocol (FTP) options on the UMPG
Alpha computer following the installation of Multinet software. The only
remaining problem with the UMPG Alpha is the unavailability of Tektronix print
support (license pending). Once the Tektronix print driver is installed, the
UMPG Alpha (node UMPGAL) will replace UMPG0 (the existing UMPG VAX node) as
the operational machine.
No testing of the new CMS software release (R7B1V2) occurred this week. The
FOT currently does not have a workstation hooked up to the back-up UCMS system
(UCMSB), where the new software currently resides in a test environment.
FOT investigated the status of the conversion device(s) (CD) located in MSOCC
operations area. Apparently, there are some problems with the CDs processing
GCMR(s) together with telemetry but UARS can still use them to test receipt of
return link telemetry. However, since the FOT is currently operating out of
the temporary control center, it may be difficult to configure a parallel test
which would require extra terminals connected to the AP system that will
receive the IP data.
Investigation of the stored command verification problem - time to complete -
associated with Applications Processor (AP) software release 10.08 continued.
The cause has been identified but rectifying the problem continues.
Repercussions of relocating the UCMS and the UCMSB from one side of the control
center to the other continued this week. Apparently during the relocation, the
lines which connect each system to the CDHF were inadvertently reversed, and
the line which was previously connected to UCMSB became connected to the UCMS
(and vice versa). This in itself is not a problem except for the fact that the
old UCMSB line is apparently RflakyS and works intermittently. After the line
problem was noticed, the hardware maintenance personnel and the CMS system
managers restored the lines to their original configuration.
OTHER SIGNIFICANT EVENTS
Monitoring of the magnetic field model performance continues. First, second
and third order magnetic field models were generated using MATLAB software.
With the graphic capabilities of MATLAB, the progression of the spherical
harmonic equations are more easily seen.
Procedures were developed to install new flight software patch (revision V62B)
to support proper skew wheel speed reversal following the next yaw maneuver.
Attempts to test the procedure with the UTTS were unsuccessful due to hardware
problems (with the UTTS CDHF rack and the NASCOM line drivers).
The task to provide documentation and related information about the UARS CDHF
plot software was completed and released in UARS FOT MEMO 97-040, 97-041, and
97-042.
FOT continues to develop an updated Power Profile for UARS due to the current
status of the Modular Power System.
FOT continues to support the new UARS ground system re-engineering effort. The
FOT is currently working on providing a floppy disk copy of the current UARS
database in ASCII format. Apparently, the database cannot be easily downloaded
in an ASCII format from the OBCSTF, so the FOT is working on converting the
necessary files using other sources.
MEETINGS
No UARS Battery telecon was held this week. The next telecon has not been
scheduled.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is currently scheduled for 07 November 1997
at 311/132708.
The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust will
probably be required in mid-1998.
FACILITIES
The carpet in the UARS/TOMS Mission Operations Room (MOR) has been replaced and
the new semi-circular console is in place. Operations continue from a
dedicated room in the EOS area which is across the hall.
PERSONNEL CHANGES
Rich Calvin, Off-Line Observatory Engineer, submitted his registration
effective 03 November 1997 to accept a position with Motorola.
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 24 October 1997
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
33349 291/1615 97-519 OBC Clk Adj fr 20.6 to 0.00 msec/day
33368 292/2321 97-520 HRDI Power OFF
33368 292/2321 97-521 ACRIM/SUSIM Power OFF
33370 293/0204 97-522 OBC Clk Adj fr 0.00 to 20.6 msec/day
33382 293/2129 97-523 MLS Power ON
33405 295/1127 97-524 SUSIM/CH RTS To Enable Comp Htr 18 A&B sides
33409 295/1635 97-525 SUSIM/CH RTS To Enable Comp Htr 18A Full-time
33411 295/1957 97-526 SUSIM/CH RTS TO CYCLE CH18A&B ON IN DAYTIME
33417 296/0535 97-527 OBC/CLK Clk Adj fr 20.6 to 0.00 msec/day
33340 297/1825 97-528 OBC Clk Adj fr 0.00 to 20.6 msec/day
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 24 October 1997
The following Out-of-Limit (ALARM) conditions were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
OBSSOC2 Y-LO Battery 2 Current SOC 33340-33443
SUMEBPBI R-LO SUSIM Pulse Bus Cur 33369-33443
SUMEBQBI R-LO SUSIM Quiet Bus Cur 3369-33443
HRIFESURVTMP Y-HI HRDI IFE Survival Temp 33371,74
QTSISAIF Y-HI SSPP Baseplate by SISA I/F 33376-33443
OBSBATVEON2 Y-LO Battery 2 voltage at EON 33388-33443
OBSBATVEON3 Y-LO Battery 3 voltage at EON 33388-33443
OBSVLBEON Y-LO Load Bus Volts at EON 33385-33443
QTACRIMIF Y-HI SSPP Temp at ACRIM I/F 33399-414
OBSSOC2 R-LO Battery 2 Current SOC 3405-08
OBSVLBEON R-LO Load Bus Volts at EON 33410,18-19,35,38,41,54-55
OBSBATVEON3 R-LO Battery 3 voltage at EON 33410,18-19,31,35,38,40-
41,54-55
QTSSPPMX Y-HI SSPP -X Thermostat 33389-90,405-8
QTSSPPPX Y-HI SSPP +X Thermostat 33405-08,435-6
OBSBATVEON2 R-LO Battery 3 voltage at EON 33410,18-19,24,38,54
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
SOPUPERSTATA SOLSTICE is in an unexpected state 33371-33443
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 24 October 1997
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
33349 291/16:19 (18 Oct 97) from 20.6 to 00.0 msec/day
33370 293/02:09 (20 Oct 97) from 00.0 to 20.6 msec/day
33417 296/05:39 (23 Oct 97) from 20.6 to 00.0 msec/day
33440 297/18:38 (24 Oct 97) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 24 October 1997
18 Oct. 1997 - GMT Day 291 Beta = 43.3 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 +0.00/0.00 18.7 0.000 0.00
2 +47.6/-15.4 5.79/4.51 +27.6/-14.9 26.1 1.022 21.5
3 +74.2/-5.60 4.51/3.23 +26.4/-14.9 26.1 1.023 20.7
24 Oct. 1997 - GMT Day 297 Beta = 44.1 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 -2.69/-3.68 +0.00/0.00 18.7 0.000 0.00
2 +79.8/+2.80 7.09/5.47 +28.4/-16.0 24.3 1.021 23.3
3 +64.4/-7.00 5.79/4.51 +27.5/-16.1 24.2 1.023 22.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes
_______________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 October 1997
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
97-117 FOT 33360 292/0935 19551 Data Loss/SSA Failover
97-111 FOT 33361 292/1115 14170 Generic Late Acquisition
97-111 FOT 33393 294/1423 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
None this report period
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period