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UARS WEEKLY STATUS REPORT - 13 March 1998
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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 turned off on March 11. It is expected to resume operations
on March 17. Otherwise, SUSIM successfully gathered its normal solar,
offset, and occultation scan data during this past week without apparent
problems.
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PEM
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PEM/AXIS was activated from March 2 through March 6. During this time,
AXIS produced energy deposition profiles from inverted electrons obtained using
the AXIS X-ray measurements.
PEM is awaiting evaluation by GSFC of its proposed activation procedure.
The minimal configuration for PEM AUX activation is the zenith VMAG, MEPS1,
MEPS2, and HEPS1 units, only. This configuration is driven by the capabilities
of the spacecraft OBC and may increase if OBC program area increases. PEM
activation is proposed to be OBC driven when there exists plenty of power to
operate PEM. It is anticipated that the OBC will activate PEM on the daylight
portions of every orbit.
PEM will support the UARS Science team meeting March 16 through March 18.
The PEM PI, J. D. Winningham, will give a status update on PEM. PEM will have
two Oral presentations on Monday, March 16: "The UARS PEM Energetic Particle
Climatology - Status and Applications," (J. R. Sharber, R. A. Frahm, G. Crowley,
A. J. Ridley, R. Link, J. D. Winningham, E. E. Gaines, R. W. Nightingale,
D. L. Chenette, and W. R. Keith) and "Particle Effects on the Middle Atmosphere
Modeled using the Parallelized TIME-GCM," (G. Crowley, A. J. Ridley,
J. D. Winningham, R. Link, R. A. Frahm, J. R. Sharber, R. G. Roble, A. Richmond,
and J. M. Russell III). In addition, there will be a PEM poster on Tuesday,
March 17: "A Global PEM Electron Precipitation Climatology for the Kp Index:
Work in Progress," (R. A. Frahm, G. Crowley, J. R. Sharber, J. D. Winningham,
R. Link, A. J. Ridley, E. E. Gaines, D. L. Chenette, B. J. Anderson and
T. A. Potemra). All these PEM presentations deal with creating a PEM particle
based climatology.
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HALOE
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Nothing received.
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MLS
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MLS was reactivated successfully on Mar 12, in the reduced 85 watt power mode.
MLS instrument operations have continued flawlessly. MLS is scheduled to
operate through Mar 16.
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HRDI
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HRDI was turned off end of day March 11. We expect to be turned back on
March 17.
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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
Scientist with the scheduling of instrument operations.
We welcome Robin Gordon as the new member of the UARS Mission
Planning Group here at GSFC.
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CDHF
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The CDHF has received a total of 377 CD-ROM requests as of 13-March-1998.
There was one order received and shipped.
The CDHF previewed DAAC data created in the month of January, 1998 for
HALOE, HRDI, PEM, NMC, and UKMO.
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 (1379R-1004C=375L)
129 days MLS (4.90) PROD (1297R-933C=364L)
11 days CLAES (7.0) ENG (19R-19C=0L)
0 days HAL (4.80) ENG (2R-0C=2L)
2 days SEN (5.0) PROD (2R-2C=0L)
The CDHF continued development of a list of Year-2000 compliant software
needed by the CDHF.
Pending software upgrades: IDL 5.0, OpenIngres, UCSS.
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FOT
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REPORTING PERIOD
This report covers 27 February 1998 (Orbit 35316, GMT Day 058) through 06
March 1998 (Orbit 35434, GMT Day 065).
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
MLS 059/0108 35331 On
WINDII 060/0220 35346 On
PEM 061/0116 35361 AXIS on
MLS 062/2342 35390 Off
HALOE 063/0135 35391 On
PEM 065/2222 35434 AXIS off
A summary of Instrument operations supplied by the Mission Planning Group
for the month of February 1998 is contained in Appendix F, UARS Instrument
Operations Summary.
The beta angle is now increasing toward a maximum angle of 54.5 degrees on
15 March 1998 (DOY 074).
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 25.4 V 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 28 February 1998 and 06 March 1998 are provided in Appendix
D.
The clock error ranged from -11.0 to +10.2 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 = 02
% OUT-OF-LIMITS = 04
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 03
% HALOE 01
% HRDI 02
% MLS 02
% PEM 02
% SOLSTICE 01
% WINDII 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 03
TRANSPONDER FREQUENCIES:
Transponder A: 98/041 - 2287.497104
Transponder B: 98/042 - 2287.499330
GROUND SYSTEM OPERATION
Two (2) 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 98/064 show the observatory data loss to be
20 hours, 42 minutes, 7.540 seconds (no change since last reported). This
is a 0.0366 percent data loss which equals a 99.9634 percent data capture
for the mission.
FOT continues to investigate the feasibility of participating in the IP
Forward Link testing. The methodology and requirements for performing a
command loop-back test is currently under investigation.
The inability to transmit commands to the UARS Test and Training Simulator
(UTTS) was first observed on 24 February 1998. Investigation of this
problem which impacts AP software testing, etc. continues.
The FOT is investigating the possibility of utilizing the RUPS (located in
MSOCC) to record high speed NBTR playbacks, and subsequently play them back
at a slower rate to the UARS re-engineering ground system. Apparently this
is not an operational capability, has been attempted in the past, but
knowledgeable personnel are no longer available.
Testing of the latest AP software (modified to support a reduced ATC load)
is on hold due to the UTTS problem.
Operational processing of level-0 telemetry analysis files continues in
parallel on both the UMPGAL (new MPG Alpha machine) and CDHF computer
systems. No level-0 file transfer failures (between CDHF and UMPGAL)
occurred this week.
FOT assisted in updating the magnetometer model on the UTTS for future
orbit adjust simulations. Updated model coefficients generated from
spacecraft data were provided.
UARS playback data will be captured on the White Sands Ground Terminal
line-outage recorders during the planned GFSC building 23 power outage from
about 12 pm on Friday, 20 March 1998, until about 12 pm on 23 March 1998.
The UARS elements affected are the Data Capture Facility, Level-0 Data
Processing, Central Data Handling Facility (CDHF), and possibly the Near
Realtime Data (NRT) flow. Playback data quality will be monitored at White
Sands Ground Terminal (WSGT) using the WSGT Data Quality Monitor (DQM).
All recorded data will be replayed to building 23 and processed following
the outage.
OTHER SIGNIFICANT EVENTS
Work on the upgrade of the OBC Power Monitor (PMON) software continued.
Work in this area was also impacted by the UTTS command problem. OBC
software development can not be done on the UTTS VAX when the UTTS is
active for troubleshooting.
Orbit Adjust planning has been initiated. The tasks have been identified
and a schedule developed.
A plan to cycle spacecraft heaters during the planned powering OFF of the
SSPP instruments (starting DOY 071) was initiated. Previous experience
indicated that a revision to the plan was desirable. For this reason, the
FOT has revisited and carefully thought out the necessary heater commands
(which will be controlled via RTSs) to perform the heater cycling, without
adversely impacting power.
FOT is supporting CNMOS in their efforts to make necessary software changes
(MSOCC, CMS, DCF, etc.) to support the year 2000 rollover.
Monitoring of the magnetic field model performance continues.
FOT continues to improve a Power Profile for UARS based on the current
status of the Modular Power System.
FOT continues to support the new UARS ground system re-engineering effort.
MEETINGS
No UARS Battery telecon was held this week. The next telecon has not been
scheduled.
FUTURE SIGNIFICANT EVENTS
All building 23 power will be down during the weekend of 20-23 March 1998
to perform work on the building power supply. The building 23 systems will
be unavailable from about 12 pm on Friday, 20 March 1998, until about 12 pm
on 23 March 1998.
The next UARS Yaw Around Maneuver is currently scheduled for 02 April 1998.
A second building 23 power outage is scheduled from about 12 pm, 24 April
1998, until about 12 pm, 27 April 1998.
UARS Flight Operations plans to attend the Program Experience portion of
the Space Power Workshop at JPL in April 1998. UARS FOT plans on
presenting an overview of the UARS batteries and their performance.
The UARS orbit altitude is dropping slowly and a drag makeup orbit adjust
is targeted for 05 August 1998.
PERSONNEL CHANGES
None.
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 F, UARS Instrument Operations Summary
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 06 March 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
35333 059/0712 98-072 MLS Power ON
35338 059/1210 98-073 OBC Clk Adj 20.6 to 0.0 msec/day
35344 059/2231 98-074 HRDI Htr Cycle 300 to 150 amp min
35346 060/0110 98-075 WINDII Power ON
35361 061/0116 98-076 PEM AXIS-Power ON
35363 061/0451 98-077 SOLSTICE Reload D060 Micro-Loads
35390 062/2357 98-078 MLS Power OFF
35391 063/0135 98-079 HALOE Power ON
35392 063/0313 98-080 HRDI Htr Cycle to 100 amp min
35398 063/1235 98-081 OBC Clk Adj 0.00 to 20.6 msec
35425 065/0744 98-082 OBC Clk Adj 20.6 to 0.0 msec/day
35434 065/2222 98-083 WINDII Power OFF
35434 065/2222 98-084 PEM Power OFF AXIS
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 06 March 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
WIEUTEMP Y-LO WINDII EU Temperature 35330-45
QTSISAIF Y-LO Baseplate by SISA I/F 35330-45,50-60,66
HRPSEQBIMON Y-HI HRDI PSE Quiet Bus I Monitor 35337-8,42,53,58,60,85
WIEUTEMP Y-LO WINDII EU Temperature 35346
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
HGCMDERR HGA CMD ERROR (Due to OMNI Support) 35377
WISRCBBS WINDII Broadband Source Operating 35378
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 06 March 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
35338 059/12:13 (28 Feb 98) from 20.6 to 00.0 msec/day
35398 063/12:44 (04 Mar 98) from 00.0 to 20.6 msec/day
35425 065/07:50 (06 Mar 98) from 20.6 to 00.0 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 06 March 1998
28 Feb 1998 - GMT Day 059 Beta = 13.1 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 -3.05/-4.31 +0.0/ +0.0 18.6 0.000 0.0
2 +89.6/ 0.0 +7.09/+4.51 +32.0/-15.6 24.2 1.018 23.6
3 +44.8/-16.8 +5.79/+3.23 +31.2/-16.0 24.2 1.022 23.0
06 Mar 1998 - GMT Day 065 Beta = 36.5 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 -3.68/-4.31 +0.0/ +0.0 18.4 0.000 0.0
2 +95.2/ -5.6 +6.11/+4.83 +30.4/-16.0 25.6 1.026 22.4
3 +61.6/ -11.2 +5.15/+3.87 +29.6/-16.0 25.4 1.026 21.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes
APPENDIX E
UARS ANOMALY REPORTS
Week ending 06 March 1998
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-008 FOT 35354 060/1353 14170 Generic Late Acquisition
98-009 FOT 35364 061/0634 14170 Generic Late Acquisition
98-010 FOT 35431 065/1724 N/A Error in CMS file transfer
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
_______________________________________________________________
APPENDIX F
UARS INSTRUMENT OPERATIONS SUMMARY
Week ending 06 March 1998
INSTRUMENT SUMMARY FOR MONTH OF February 1998 (hours)
UNPLANNED UNSCHEDULED
ON OFF OFF OFF
(Insufficient (Other than
Instrument (Actual) (Scheduled) Power) Power Problem) COMMENTS
---------- ------ ----------- ----------- ------------- -----------
ACRIM 672 0 0 0
HALOE 177 495 0 0
HRDI 262 410 0 0
MLS 370 302 0 0
PEM (axis) 24 648 0 0
PEM (zeps) 47 625 0 0
PEM (neps) 0 672 0 0
SOLSTICE 672 0 0 0
SUSIM 672 0 0 0
WINDII 247 425 0 0
Cold side of spacecraft was facing northward: 24.5 days
Cold side of spacecraft was facing southward: 3.5 days