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UARS WEEKLY STATUS REPORT - 13 NOV 1998
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Due to network problems some of the weekly reports were delayed for the week
ending on NOV 06. These are included in UARS WEEKLY STATUS REPORT for NOV 13
(for PEM, HALOE and WINDII).
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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.
SUSIM plans to turn off during the Leonid storm. No important loss of
daily data is anticipated.
Reprocessing of all SUSIM experiment days to version 20 continues.
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PEM
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November 6,1998
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 have had limited
success, but in general are still failing to enable the instrument correctly.
Additional tests are scheduled.
November 13, 1998--Nothing received.
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HALOE
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November 6, 1998
HALOE was successfully powered on beginning of day today using the recently
implemented two step, power on for low beta, after yaw, operations. All
engineering parameters are nominal.
November 13, 1998--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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Nothing received.
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WINDII
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November 6, 1998
A joint Canada/France WINDII meeting was held at OHP in France,
October 8,9 1998. The formal delivery for the WINDII processing
software, Version 5_10, is proceeding.
November 13, 1998--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 437 CD-ROM requests as of 13-November-1998.
There were four 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.
1 day HAL (4.80) PROD (L1) (1874R-1874C=0L)
11 days HAL (4.80) PROD (L2-L3) (29R-11C-2F=16L)
31 days HAL (4.80) PROD (L3) (1874R-1170C=704L)
54 days SOL (4.62) PROD (L2-L3) (2313R-2017C=296L)
197 days SUS (7.00) PROD (L1) (2370R-269C=2101L)
2 days CLA (7.00) ENG (L1-L3) (18R-6C=12L)
1 day WIN (5.10) ENG (L1-L3) (1R-1C=0L)
CDHF personnel attended a meeting to determine a method to safely perform
Y2K Time-Shift testing on a subset of the UARS CDHF VMS cluster.
CDHF pending software upgrades: IDL 5.1, OpenIngres, UCSS 10.1, MSS 4.1,
NRT 2.5, UOAS 5.4
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FOT
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REPORTING PERIOD
This report covers 31 October 1998 (Orbit 38999, GMT Day 304) through 06
November 1998 (Orbit 39102, GMT Day 310).
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
HALOE 310/0608 39090 On
A summary of Instrument operations supplied by the Mission Planning
Group for the month of October 1998 is contained in Appendix F, UARS
Instrument Operations Summary.
The beta angle ranged between 13.9 degrees to 15.1 degrees for this
report period. The beta angle is now increasing toward a maximum angle of
77.0 degrees on 22 November 1998 (DOY 326).
A Forward-to-Reverse Yaw Around maneuver (number 73) was
successfully executed in Orbit 39038 beginning at 306/14:56:29 and
completing at 306/15:33:39 on 02 November 1998. The SSPP Instruments
(ACRIM, SOLSTICE, SUSIM) were enabled. Due to the SA position at 269
degrees, the effective night length of the spacecraft after the maneuver was
approximately 52 minutes. Post maneuver analysis of data indicate that
during the Yaw Around, the end-of-night load bus voltage was 23.8 volts
and the average depths of discharge (DODs) on Batteries 2 and 3 were
approximately 23.5 and 23.0 percent respectively. The next (reverse-to-
forward) YAW is scheduled for 13 December 1998.
Flight Operations continues to work with the PEM instrument to fine tune
the operational command sequences associated with the OBC Power Monitor
day-only operational capability. The timing problem with RTS-06 (HEPS1
bias level) has been resolved. PEM was configured to switch from science to
RAM Dump mode for one day-only period on Day 311 to provide insight into
the command sequence processing by the microprocessor.
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 1.0 to 1.3 degrees C. Additional battery
performance data for each battery on 30 October 1998 and 06 November
1998 are provided in Appendix D.
Battery 1 differential voltage has fallen over the last two weeks from
728.0 to its current values listed in Appendix D. This is most likely
indicative of the fact that more cells have failed on the opposite side of the
battery.
The clock error ranged from -0.1 to 9.3 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 = 02
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% FOT 00
% PEM 07
% HALOE 02
% HRDI 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 10
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 98/286 - 2287.496917
Transponder B: 98/300 - 2287.498980
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 98/309 show the observatory data loss to be
21 hours, 11 minutes, 38.580 seconds (an increase of 31.840 seconds since
last report period). This is a 0.0339 percent data loss which equals a
99.9661 percent data capture for the mission.
The increase of 31.840 seconds occurred over seven (7) days:
7 4.736 seconds on Day 303 due to hits in data (IP);
7 2.176 seconds on Day 304 due to IP hits and hits in data;
7 4.672 seconds on Day 305 due to hits in data (IP);
7 12.192 seconds on Day 306 due to hits in data (IP);
7 2.880 seconds on Day 307 due to IP hits and hits in data;
7 3.392 seconds on Day 308 due to hits in data (IP); and
7 1.792 seconds on Day 309 due to hits in data (IP).
Telemetry and Command Computer (TAC) RcrashesS have increased
since the switch to the IP system. The possible cause of this RcrashS
frequency increase is currently under investigation.
The FOT modified the CMS resident Relative Time Sequence 06 (RTS
06) again to facilitate proper PMON-controlled day-only operation of the
PEM instrument.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
Investigation continues into possible impacts of the Leonid meteorite
shower in November 1998. A plan is being prepared and the necessary
UARS commanding identified.
Investigating the feasibility of a new PMON action to change battery V/T
curves based on loading to mitigate battery risks in sun pointing safehold.
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 a valid set of
3-day PSAT and S/C Orbital Events files from FDF which span the 2000-to-
2001 century crossover. Up to this point, all of the PSAT and S/C Orbital
Events files generated for that time frame appear to have an Rascending
nodeS inconsistency between the two files, making it impossible to process
them on CMS. With the receipt of these two files, the FOT can now finish the
majority of the Y2K testing that pertains to the year 2000-to-2001
crossover.
The FOT is still waiting for a Y2K 8-week S/C Orbital Events file from FDF
which contains a SC_YAWMAN event. Once the FOT receives this file, the
last remaining Y2K test function (#12) of the 1999-to-2000 test case (#1)
can be completed
Flight Dynamics Facility (FDF) - see CMS paragraph.
IP NETWORK TESTING
Space Network (SN) - Operational.
NCC 98 system - Complete (during SCS-21 demo verification).
Deep Space Network (DSN) and Ground Spaceflight Tracking and
Data Network (GSTDN) - Data flow test has been scheduled for 10
November 1998 with the Canberra (46) station.
UARS PROPULSION MODULE B/D THRUSTER LINE FILL
GSFC Propulsion Branch reported that the propulsion engineers will be ready
to support the UARS simulated line refill test following the Thanksgiving
holiday (26 November). The UARS FOT is preparing a draft task description
for procurement of Jackson and Tull support for the line refill test. Al Centa
(NASA UTTS Technical Officer) requested that he approve personnel who
will provide the hardware connectivity with the UTTS simulator and that he
be present when the test are run. FOT is preparing the Latch valve
command sequences and testing them with the UTTS simulator in
preparation for the simulation with hardware.
UARS RE-ENGINEERING - TELEMETRY PROCESSING
Flight operations is providing assistance on both sustaining engineering and
re-engineering activities to incorporate needed features into the Trending
system. Testing of the Trending System v.1.1 release (CM-0009) began on
Friday. Nearly all of the reportedly fixed DRs were confirmed. One DR was
sent back as partially completed, another DR as incomplete.
MEETINGS
The next battery telecon is scheduled for 24 November 1998.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver is scheduled for scheduled for 13
December 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 F, UARS Instrument Operations Summary
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 06 November 1998
ORBIT AOS NO SUBSYS REASON
----- --- --- ------ -------
39041 306/2038 98-421 HRDI RTS-6 Activate
39041 306/2038 98-421 PEM PEM/HEPS Test
39053 307/1607 98-423 PEM PEM/HEPS Test
39054 307/1723 98-424 PEM PEM/HEPS Test
39068 308/1733 98-425 PEM PEM/HEPS Test
39071 308/2046 98-426 PEM PEM/HEPS Test
39084 309/1734 98-427 PEM PEM/HEPS Test
39090 310/0153 98-428 HALOE Power ON
39092 310/0608 98-429 HALOE Power ON Complete
39100 310/1910 98-430 PEM PDB update
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 06 November 1998
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
HRPTSPBIMON R-LO PTS Pulse Bus Current Monitor 39091
NBRECBI Y-HI NBTR B Current 39092-3
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None this report period
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 06 November 1998
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
- No clock adjust during this report period
_______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 06 November 1998
30 Oct 1998 - GMT Day 303 Beta = 13.9 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 +470.0/+190.4 -3.05/-3.99 +0.0/ +0.0 17.1 0.000 0.0
2 +44.8/ 0.0 +7.09/+5.47 +31.6/-14.4 24.2 1.022 22.8
3 +128.8/+11.2 +5.79/+4.51 +30.8/-16.0 24.2 1.020 22.6
06 Nov 1998 - GMT Day 310 Beta = 15.1 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 +100.8/+78.4 -3.05/-4.94 +0.0/ +0.0 16.8 0.000 0.0
2 +39.2/-11.2 +5.79/+3.87 +31.6/-14.4 24.5 1.021 21.9
3 +128.4/0.0 +4.51/+2.60 +30.8/-16.0 24.5 1.019 21.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes (V/T 5)
APPENDIX E
UARS ANOMALY REPORTS
Week ending 06 November 1998
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-089 FOT 38018 305/0633 N/A TAC 8 Crash
98-090 FOT 39024 305/1657 N/A No TAC configured
98-091 FOT 39029 306/0124 23018 Bad ODM data
98-093 FOT 39065 308/1121 N/A TAC 8 Crashed
98-094 FOT 39067 308/1440 N/A TAC 2 Crashed
98-095 FOT 39081 309/1249 N/A TAC 8 Crashed
98-096 FOT 39086 309/2049 N/A TAC 2 Crashed
98-097 FOT 39088 309/2325 N/A TAC 2 Crashed
98-098 FOT 39094 310/0935 N/A TAC 2 Crashed
98-099 FOT 39095 310/1113 N/A TAC 2 Crashed
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
98-066 FOT OCT 98 14170 GENERIC LATE ACQ
98-087 FOT 38994 303/16:37 TAC 2 CRASH
98-088 SKIP - NOT ISSUED
98-089 FOT 39018 305/06:33 TAC 8 CRASH
98-090 FOT 39024 305/16:57 NO TAC CONFIGURED
98-091 FOT 39029 305/01:24 20318 BAD ODM DATA
98-093 FOT 39065 308/11:21 TAC 8 CRASH
98-094 FOT 39067 308/14:30 TAC 2 CRASH
98-095 FOT 39081 309/12:49 TAC 8 CRASH
98-096 FOT 39086 309/20:49 TAC 2 CRASH
98-097 FOT 39088 309/23:25 20335 TAC 2 CRASH
98-098 FOT 39094 310/09:35 TAC 2 CRASH
98-099 FOT 39095 310/11:13 TAC 2 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
------ ------ ----- ---- --- -----------------
98-092 FOT Nov 98 See List 14170 GENERIC LATE ACQ
_______________________________________________________________
APPENDIX F
UARS INSTRUMENT OPERATIONS SUMMARY
Week ending 06 November 1998
INSTRUMENT SUMMARY FOR MONTH OF October 1998 (hours)
UNPLANNED UNSCHEDULED
ON Day- OFF OFF OFF
Only (Insufficient (Other
Instrument (Actual) Ops (Scheduled) Power) Problem) COMMENTS
---------- ------ --- ----------- ----------- ----------- --------------
ACRIM 744 0 0 0
HALOE 533 211 0 0
HRDI 264 480 0 0 0
MLS 108 624 0 12 See Note 1
PEM (axis) 0 744 0 0
PEM (zeps) 0 708 36 0 0
PEM (heps) 0 0 0 744 See Note 2
SOLSTICE 744 0 0 0
SUSIM 744 0 0 0
WINDII 306 438 0 0
Note 1. MLS turned OFF approximately 12 hours earlier than scheduled due to
high scan actuator temperature.
Note 2. PEM High Energetic Particle System was scheduled to be on for day-
only operation. However, it remained OFF during October due to a problem with
the definition of the automated turn-on procedure for instrument high-voltage
power.
Cold side of spacecraft was facing northward: 0.0 days
Cold side of spacecraft was facing southward: 31.0 days
SEVNTFW45