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UARS WEEKLY STATUS REPORT - 16 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 has now begun.
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PEM
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Nothing received.
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HALOE
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HALOE continues to operate successfully with all engineering parameter
within nominal operating range. Science results continue to be excellent.
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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 has been operating full time since October 12, and will return to
daytime only operations under the control of the PMON on Oct. 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.
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CDHF
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The CDHF has had problems with one of the power distribution units as well
as a separate problem with CDHF2. Since CDHF2 is still being evaluated we
have put NRT, Quicklook and Level0 ingests on a different node in the UARS
CDHF cluster.
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.
91 days HAL (4.80) PROD (L1) (1873R-1729C-24F=120L)
92 days HAL (4.80) PROD (L3) (1873R-1109C=764L)
62 days SOL (4.62) PROD (L2-L3) (2349R-1810C=539L)
169 days SUS (7.00) PROD (L1-L2) (300R-169C=131L)
104 days SUS (7.00) PROD (L1-L3) (1249R-104C=1145L)
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FOT
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REPORTING PERIOD
This report covers 03 October 1998 (Orbit 38579, GMT Day 276) through 09
October 1998 (Orbit 38683, GMT Day 282).
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
HALOE 276/1204 38587 On
WINDII 278/0255 38611 On
HALOE 278/2201 38623 Off
MLS 279/0335 38626 On
WINDII 279/2235 38638 HB-A On
MLS 282/0358 38672 Off
MLS 282/2024 38682 On
The beta angle ranged between 10.1 degrees to 34.6 degrees for this report
period. The beta angle is now increasing toward a maximum angle of 48.0
degrees on 17 October 1998 (DOY 290).
Fine tuning of the Power Monitor Rday onlyS operational capability
continues. Adjustments were made to the HRDI heater cycling on 05 October.
Investigation continues to verify command sequences for PEM high voltage
operation. Modification of WINDII heater control through PMON is also in
process.
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 1.2 degrees C. Additional battery performance data
for each battery on 02 October 1998 and 09 October 1998 are provided in
Appendix D.
The clock error ranged from 10.0 to -11.7 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 = 05
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 06
% HALOE 03
% MLS 03
% WINDII 06
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 03
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 98/281 show the observatory data loss to be
21 hours, 08 minutes, 51.988 seconds (an increase of 14.112 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 14.112 seconds occurred over six (6) days:
7 0.448 seconds on Day 275 due to line error;
7 0.896 seconds on Day 276 due to insufficient overlap;
7 0.544 seconds on Day 277 due to hits in data;
7 1.792 seconds on Day 279 due to insufficient overlap and hits in data;
7 8.928 seconds on Day 280 due to insufficient overlap; and
7 1.504 seconds on Day 281 due to insufficient overlap.
UARS transitioned to Internet Protocol (IP) for Space Network support on 08
October 1998. Ground Network supports remains unchanged.
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) - Discussing UARSU scheduling requirements that
will be built into the NCC T98 compatible UPS software.
Multi Satellite Operations Control Center (MSOCC) - No change.
Command Management System (CMS) - Waiting for planning aids.
Flight Dynamics Facility (FDF) - No change.
IP NETWORK TESTING
Space Network (SN) - Declared successful at the IP Transition ORR.
NCC 98 system - In planning.
Deep Space Network (DSN) and Ground Spaceflight Tracking and Data Network
(GSTDN) - No change and still incomplete.
UARS PROPULSION MODULE B/D THRUSTER LINE FILL
The B/D thruster refill effort continues.
UARS RE-ENGINEERING - TELEMETRY PROCESSING
Flight operations is providing support to the re-engineering effort to
process the UARS telemetry on the TOMS/EP control center computer system.
Evaluation of software performance continues.
MEETINGS
FOT attended a Leonid Shower meeting with FDF personnel on 06 October 1998.
FDF presented general information about the upcoming Leonid Shower in
November and inquired about additional information required by UARS.
UARS supported a meeting with Code 300 personnel on 08 October 1998 to
discuss Code 300 access to the historical UARS Anomaly Report information.
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
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 09 October 1998
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
38584 276/0802 98-372 OBC Clk Adj fr 0.00 to 20.6 msec/day
38587 276/1204 98-373 HALOE Power On (partial)
38594 276/2227 98-374 HALOE Power On (full)
38603 277/1320 98-375 OBC Clk Adj fr 20.6 to 0.00 msec/day
38611 278/0255 98-376 WINDII Power ON
38617 278/1311 98-377 OBC/PMON HRDI Heater
38623 278/2201 98-378 HALOE Power OFF
38626 279/0335 98-379 MLS Power ON
38634 279/1537 98-380 WINDII WINDII Reset
38635 279/1700 98-381 WINDII WINDII Reset
38638 279/2235 98-382 WINDII WINDII Surv HTR Bus ON
38643 280/0635 98-383 WINDII WIND ERRFIX PROC PER ALERT
38663 281/1337 98-384 OBC Clk Adj fr 0.00 to 20.6 msec/day
38668 281/2200 98-385 OBC/PEM PMON
38668 281/2200 98-387 WINDII TMON
38669 282/0040 98-386 PMON/WINDI Heater cycle update
38672 282/0358 98-388 MLS Power OFF due to Scan Temp
38682 282/2024 98-389 MLS Power ON
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 09 October 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
HAH28VA R-LO HALOE Heater Motor 38587-94
WIISUTEMP Y-LO WINDII ISU Temp 38634-36
WIISUTEMP R-LO WINDII ISU Temp 38637
NBRECBI Y-HI NBTR B Current 38647
MLSCANACTTMP R-LO Scanner Actuator Temp 38672
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
WISRCLSR WINDII LASER Operating 38672
WISRCBBS WINDII Broadband Srce Operating 38672
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 09 October 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
38584 276/08:09 (03 Oct 98) from 00.0 to 20.6 msec/day
38603 277/13:24 (04 Oct 98) from 20.6 to 00.0 msec/day
38663 281/13:37 (08 Oct 98) from 00.0 to 20.6 msec/day
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 09 October 1998
02 Oct 1998 - GMT Day 275 Beta = 10.1 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 -3.68/-4.94 +0.0/ +0.0 18.1 0.000 0.0
2 +44.8/-5.6 +4.51/+3.55 +30.4/-13.2 26.4 1.022 20.4
3 +33.6/-22.4 +3.23/+2.60 +28.8/-12.8 26.4 1.022 19.7
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
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes (V/T 5)
APPENDIX E
UARS ANOMALY REPORTS
Week ending 09 October 1998
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-066 FOT 38581 276/0802 14170 Generic Late Acq
98-067 WINDII 38643 280/0635 N/A WIND Err Code E11
98-068 FOT 38651 280/1926 Tlm hit in uplink
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-067 FOT 38643 280/06:35 WINDII ERROR CODE
98-068 FOT 38651 280/19:26 Q CH TLM DROP OUT
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