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UARS WEEKLY STATUS REPORT - 23 OCT 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 successfully gathered its normal solar, offset, and occulation
data during this past week without apparent problems.
Reprocessing of all SUSIM experiment days to version 20 continues.
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PEM
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PEM is now conducting tests of the OBC activation. PEM activation
occurs during daylight only, when there is adequate power generated from
the UARS solar array. Currently, the PEM magnetometer and medium energy
spectrometers (particles below 30 keV) activate correctly under OBC control.
Tests conducted on the high energy particle spectrometers are still failing
to enable the instrument correctly. Additional tests are scheduled.
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HALOE
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Nothing received.
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MLS
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The instrument is now off as scheduled.
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HRDI
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HRDI is currently in the daytime-only operations mode. We are
concentrating on operations of stratospheric winds in the southern
hemisphere. Operations are normal.
Kudos to Mark Burrage for receiving the University of Michigan Research
Scientist Recognition Award.
"Through his pioneering research using observations from the Upper
Atmosphere Research Satellite (UARS) mission, Mark D. Burrage has
contributed enormously to the significant new body of information about the
dynamics of winds in the Earth's upper atmosphere. This complex region of
the atmosphere, which plays a central role in controlling climate and
weather, is difficult to probe and measure. Dr. Burrage, an international
expert on upper atmospheric wind measurements and measurment techniques,
has pursued a number of important research topics that have revealed
fundamental properties of the atmosphere, including the waves and tides
that are part of atmospheric turbulence.
"Dr. Burrage is a valued member of the Space Physics Research Laboratory
and of the Department of Atmospheric, Oceanic, and Space Sciences in the
College of Engineering. Since coming to Michigan as a research fellow in
1988 and joining the faculty in 1990, he has participated wholeheartedly in
the training of graduate students. He has earned both the Department of
Atmospheric, Oceanic, and Space Sciences Excellence in Research Award and
the Space Physics Research Laboratory Paper of the Year Award.
"Dr. Burrage is an exceptionally talented data analyst and researcher and a
gifted presenter of his results, often using Web-based techniques to share
new scientific data quickly, encouraging collaborations and contributions
from the widest possible group. Dr. Burrage focuses intently on the most
significant scientific issues and works diligently and selflessly on
important long-term collaborative projects. He is regularly asked to
convene special sessions and give invited papers at national and
international symposia. His talks and papers are always substantive,
clear, and polished. Dr. Burrage is active in both the American
Geophysical Union and the European Geophysical Society.
"In recognition of his meticulous research and important contributions to
the understanding of the circulation and thermal structure of the global
upper atmosphere, his generosity as a collaborator, and his commitment to
promoting scientific inquiry, the University of Michigan is proud to
present to Mark D. Burrage its Research Scientist Recognition Award."
The University Record, Vol. 54, No. 6, Oct. 14, 1998
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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.
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CDHF
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The CDHF has received a total of 429 CD-ROM requests as of October 23,1998.
Four new orders were 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.
63 days HAL (4.80) PROD (L1) (1873R-1792C-29F=52L)
30 days HAL (4.80) PROD (L3) (1873R-1139C=734L)
41 days SOL (4.62) PROD (L2-L3) (2349R-1851C=498L)
66 days SUS (7.00) PROD (L1-L2) (300R-235C=65L)
75 days SUS (7.00) PROD (L1-L3) (1249R-179C=1070L)
CDHF pending software upgrades: UCSS 10.1, MSS 4.1, UOAS 5.4, and NRT 2.6
IDL 5.1 and INGRES 1.2.
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FOT
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REPORTING PERIOD
This report covers 10 October 1998 (Orbit 38684, GMT Day 283) through 16
October 1998 (Orbit 38788, GMT Day 289).
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 283/1228 38692 Off
HALOE 284/0327 38701 On
WINDII 284/2240 38713 Off
The beta angle ranged between 34.6 degrees to 47.6 degrees for this report
period. The beta angle is now increasing toward a minimum angle of 3.0
degrees on 02 November 1998 (DOY 306).
HRDI Power Monitor Rday onlyS operation is working correctly. The WINDII
heater problem has been corrected. Flight Operations continues to work
with the PEM instrument to fine tune the operational command sequences.
Modifications to the PEM Relative Time Sequences were made and uplinked on
16 October 1998.
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 0.9 to 1.3 degrees C. Additional battery performance data
for each battery on 09 October 1998 and 16 October 1998 are provided in
Appendix D.
The clock error ranged from -11.6 to 10.9 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 = 00
% 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 06
% HALOE 01
% MLS 01
% PEM 02
% WINDII 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 05
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 98/210 - 2287.496941
Transponder B: 98/211 - 2287.499161
GROUND SYSTEM OPERATION
One (1) 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 98/288 show the observatory data loss to be
21 hours, 09 minutes, 32.340 seconds (an increase of 40.352 seconds since
last report period). This is a 0.0342 percent data loss which equals a
99.9658 percent data capture for the mission.
The increase of 40.352 seconds occurred over six (6) days:
7 1.344 seconds on Day 282 due to insufficient overlap and hits in data;
7 29.856 seconds on Day 283 due to hits in data;
7 5.184 seconds on Day 284 due to hits in data;
7 1.696 seconds on Day 285 due to hits in data;
7 1.312 seconds on Day 286 due to hits in data; and
7 0.960 seconds on Day 288 due to hits in data.
The FOT generated new versions of several CMS resident Relative Time
Sequences (RTSs) to facilitate proper PMON-controlled day-only operation of
the PEM instrument.
CMS performance problems - processing times are noticeably longer this week
than in the past - were noted this week. The CMS system manager has been
notified and investigation into this degraded performance is underway.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
FOT continues to improve a power profile for UARS based on the current
status of the Modular Power System.
Investigation continues into possible impacts of the Leonid meteorite
shower in November 1998.
YEAR 2000 OPERABILITY SUPPORT
UARS Test and Training Simulator (UTTS) - No change.
User Planning System (UPS) - No change.
Multi Satellite Operations Control Center (MSOCC) - No change.
Command Management System (CMS) - The FOT received and processed six (6)
sets of Y2K spacecraft (OBC) and TDRS ephemeris files this week. The FOT
had previously tested similar files during Y2K testing, but these newest
files were created by FDF using Y2K compliant software. The FOT also
received a Y2K compliant Star Catalog file from FDF, but the file was not
successfully converted by the CMS poller. The FOT suspects there is
something wrong with the format of this file. Finally, the FOT is still
waiting to receive a valid Y2K Spacecraft Orbital Events file from FDF.
Once this file is received, the majority of the outstanding CMS Y2K test
functions can be performed.
Flight Dynamics Facility (FDF) - See CMS paragraph.
IP NETWORK TESTING
Space Network (SN) - Operational.
NCC 98 system - In planning.
Deep Space Network (DSN) and Ground Spaceflight Tracking and Data Network
(GSTDN) - Previous testing was performed using the Station Simulator at
JPL. The I-Channel data, 1 and 32 kbps telemetry, was verified. The
command test with the simulator was impossible since the MSOCC AP software
does not include the JPL simulator as a destination (thus, test
cancellation). The JPL Station Simulator was also unable to simulate
telemetry Q-Channel streams - OBC dump data and tape recorder playback.
FOT is attempting to determine the data source types that may be available
at the stations and schedule a station test to verify command.
UARS PROPULSION MODULE B/D THRUSTER LINE FILL
The B/D thruster refill effort continues.
UARS RE-ENGINEERING - TELEMETRY PROCESSING
Flight operations is providing assistance on both sustaining engineering
and re-engineering activities, in the form of DR's against the delivered
systems, meetings with developers and sustaining engineers, and providing
infrastructure support.
MEETINGS
The next battery telecon is scheduled for 20 October 1998 at 1:00 pm.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is scheduled for scheduled for 02
November 1998.
UARS will pass through the Leonid meteor shower on 17 November 1998 at
19:43 UTC (+/- 3 hours).
The United States Naval Observatory (USNO) issued a Time Service
announcement advising that the International Earth Rotation Service (IERS)
will retard UTC time by 1.0 second at the end of December 1998. This means
the addition of one leap second as the last second of 1998.
The next annular solar eclipse will occur on 16 February 1999 over the
Indian Ocean, Australia and the South Pacific Ocean.
PERSONNEL CHANGES
Erik Larson, UARS System Engineer, submitted his resignation effective 01
November 1998.
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 16 October 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
38690 283/0913 98-390 OBC Clk Adj fr 20.6 to 0.00 msec/day
38692 283/1228 98-391 MLS Power OFF due to high scan temp.
38698 283/2208 98-392 PMON/WIND Action 14 set to trip @12.0deg.
38701 284/0327 98-393 HALOE Power ON
38713 284/2212 98-394 WINDII Power OFF
38720 285/0926 98-395 OBC Clk Adj fr 0.00 to 20.6 msec/day
38724 285/1545 98-396 OBC/PMON Calibration curve updates
38758 287/2235 98-397 OBC Clk Adj fr 20.6 to 0.00 msec/day
38771 288/1950 98-398 PEM PEM PMON updates
38783 289/1422 98-399 OBC Clk Adj fr 0.00 to 20.6 msec/day
38784 289/1637 98-400 PEM PEM PMON updates
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 16 October 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
PEPCUPRIIE R-HI PCU Primary Current Monitor 38724
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None this report period
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 16 October 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
38690 283/09:18 (10 Oct 98) from 20.6 to 00.0 msec/day
38720 285/09:36 (12 Oct 98) from 00.0 to 20.6 msec/day
38758 287/22:40 (14 Oct 98) from 20.6 to 00.0 msec/day
38783 289/14:34 (16 Oct 98) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 16 October 1998
09 Oct 1998 - GMT Day 282 Beta = 34.6 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 -2.73/-4.31 +0.0/ +0.0 18.1 0.000 0.0
2 +22.4/-11.2 +6.11/+4.83 +30.0/-16.0 25.4 1.026 21.7
3 +22.4/-22.4 +5.15/+3.87 +29.2/-16.0 25.4 1.024 21.5
16 Oct 1998 - GMT Day 289 Beta = 47.6 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 17.9 0.000 0.0
2 +22.4/-11.2 +5.15/+3.87 +27.2/-14.8 26.1 1.028 20.4
3 +67.2/-11.2 +3.87/+2.60 +26.4/-14.4 26.1 1.026 19.9
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes (V/T 5)
APPENDIX E
UARS ANOMALY REPORTS
Week ending 16 October 1998
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-069 FOT 38714 285/0033z N/A TAC Crashed
98-070 FOT 38744 287/0041z N/A TAC 4 Crashed
98-071 FOT 38745 287/0156z 20276 TAC 8 Crashed
98-070 FOT 38753 287/1411z N/A TAC 4 Crashed
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-069 FOT 38714 285/00:33 TAC 8 CRASH
98-070 FOT 38744 287/00:41 TAC 4 CRASH
98-071 FOT 38745 287/10;56 20276 TAC 8 CRASH
98-072 FOT 38753 287/14:11 TAC CRASH
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-066 FOT Oct 98 See List 14170 GENERIC LATE ACQ
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