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UARS WEEKLY STATUS REPORT - 20 February 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. We have planned a special science experiment for
next week's solar eclipse.
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SUSIM
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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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Nothing received.
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HALOE
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Nothing received.
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MLS
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The MLS instrument has been powered off since Feb 12. MLS is scheduled to
resume north viewing operations on Feb 20.
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HRDI
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HRDI is currently on and operating properly. We are scheduled to be placed
in lower power mode at the start of the day Feb. 20. We resume normal
operations on March 7th.
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WINDII
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WINDII has planned its schedule to observe the solar eclipse of
February 26. If all goes well, with the able support of the
FOT, the WINDII fields of view will cross the solar eclipse
path in the thermosphere, about one hour after the shadow
has passed by. The effects have already been modeled by
Ray Roble with the TIME-GCM, so we hope all goes well.
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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.
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CDHF
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The CDHF has received a total of 370 CD-ROM requests as of 20-February-1998.
There were two orders received and shipped.
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-929C=450L)
120 days MLS (4.90) PROD (1344R-562C=782L)
The CDHF began 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 07 February 1998 (Orbit 35017, GMT Day 038 through 13
February 1998 (Orbit 35120, GMT Day 044).
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
HRDI 041/0051 35061 On
MLS 043/1226 35098 Off
HALOE 043/1446 35100 On
WINDII 043/2243 35105 Off
The beta angle is now decreasing toward a minimum angle of 0.0 degrees on
25 February 1998 (DOY 056).
Six SSPP SOLSTICE offsets requested by SUSIM operations were performed this
week. One offset took place each day, beginning with GMT Day 037 and
ending with GMT Day 043.
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 26.4 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta between
Battery 2 and Battery 3 of 1.4 degrees C. Additional battery performance
data for each battery on 07 February 1998 and 13 February 1998 are provided
in Appendix D.
The clock error ranged from -11.3 to +10.6 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 = none
% OUT-OF-LIMITS = 01
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 05
% HALOE 01
% HRDI 01
% MLS 01
% WINDII 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT none
TRANSPONDER FREQUENCIES:
Transponder A: 98/041 - 2287.497104
Transponder B: 98/042 - 2287.499330
GROUND SYSTEM OPERATION
No (0) 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 98/043 show the observatory data loss to be
20 hours, 42 minutes, 6.356 seconds (an increase of 14.816 seconds since
last reported). This is a 0.0369 percent data loss which equals a 99.9631
percent data capture for the mission.
7 The increase of 14.816 seconds occurred on Day 037 due to hits in the
data and scheduling constraints.
No testing of the new CMS software release (R7B1V2) occurred this week.
A terminal for the CMS backup system has been located (see FACILITIES
section).
No testing of the IP return-link telemetry was conducted this week.
Investigation into the Q-channel OBC dump problem is still underway.
The FOT has been experiencing difficulties with sending and receiving e-
mail due to the UMPGAL reconfiguration effort. Since much of the CMS
related e-mail directed to the FOT is routed through the UMPGAL, every time
the system is brought down for reconfiguration, the FOT is at risk of not
getting operations related e-mail. To complicate matters, there appears to
be no coordination when UMPGAL will be taken off-line or rebooted. Problem
is being worked.
The CNMOS UARS Ground Elements Manager has requested the FOT to schedule a
DFLX training session between the FOT and a CMF representative. Due to a
proposed Rday-shift onlyS shift schedule at CMF, the FOT will have to be
trained on how to perform load blocking on the DFLX system, should the need
to build and transmit spacecraft loads during off hours arise.
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.
SUSIM operations has submitted a request for additional SSPP SOLSTICE
offsets to occur on GMT Days 044-050.
OTHER SIGNIFICANT EVENTS
Work on the upgrade of the OBC Power Monitor (PMON) software continued.
The code is being RdebuggedS.
Assistance was provided to the UARS/TOMS re-engineering team in
interpreting UARS operational requirements for the new ground system.
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
FOT supported a meeting with the re-engineering team on 12 February 1998 to
provide information regarding current UARS trending requirements.
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 25 February
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
will probably be required in 1999.
FACILITIES
A surplus VAX Station 3100 has been acquired from the Mission Planning
Group (MPG) and relocated to the UARS Mission Operations Room (MOR).
The VAX Station has been installed - connected to the Command Management
System (CMS) backup computer - and is currently waiting system manager
set-up.
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 A
REAL-TIME COMMAND SHEETS
Week ending 13 February 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
35022 038/1048 98-046 OBC/CLK Clk Adj 20.6 to 41.2
35061 041/0051 98-047 HRDI Power ON
35067 041/1024 97-048 OBC/CLK Clk Adj fr 41.2 to 20.6
35077 042/0200 98-049 OBC Clk Adj fr 20.6 to 0.00
35093 043/0344 98-050 OBC/CLK Clk Adj fr 0.00 to 20.6
35098 043/1226 98-051 MLS Power OFF
35100 043/1446 98-052 HALOE Power ON
35105 043/2243 98-053 WINDII Power OFF
35118 044/1949 98-054 FOT Cleared TMONUs
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 13 February 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
ACHTRV2 R-LO ACRIM Heater Voltage 35017-35068
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
none this report period
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 13 February 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
35022 038/10:56 (07 Feb 98) from 20.6 to 41.2 msec/day
35067 041/10:32 (10 Feb 98) from 41.2 to 20.6 msec/day
35077 042/02:09 (11 Feb 98) from 20.6 to 00.0 msec/day
35093 043/03:50 (12 Feb 98) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 13 February 1998
07 Feb 1998 - GMT Day 038 Beta = 71.2 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 -3.05/-4.62 +0.0/ +0.0 18.6 0.000 0.0
2 +39.2/ -11.2 +3.87/+2.29 +20.4/-16.0 26.7 1.038 17.3
3 +28.0/ -22.4 +2.92/+1.34 +19.2/-15.2 26.7 1.035 16.6
13 Feb 1998 - GMT Day 044 Beta = 51.1 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ------------ ---------- ----------- ------- ------- ------
1 +728.0/+728.0 -3.36/-4.62 +0.0/ +0.0 18.6 0.000 0.0
2 +33.6/ -11.2 +5.15/+3.87 +27.2/-15.2 26.4 1.033 20.5
3 +56.0/ -22.4 +3.87/+2.60 +26.4/-15.2 26.4 1.030 19.8
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
(no change)
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APPENDIX E
UARS ANOMALY REPORTS
Week ending 13 February 1998
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
None this report period
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