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UARS WEEKLY STATUS REPORT - 26 DEC 2003
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SOLSTICE
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During this week SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods. On average, we
received 53% of each day's data amounting to about 515 minutes of solar
observing time per day.
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SUSIM
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SUSIM successfully gathered all of its daily mid (1.1 nm)
resolution, Mg II, and high resolution monitoring scans
during this past week for periods of UARS telemetry or
onboard tape recording.
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PEM
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*** Happy Holidays from PEM ***
Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2003119 has been
reprocessed and archived at the GSFC DAAC.
Level 2 PEM MEPS data file documentation is complete and submitted to
the DAAC. MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 1992129.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered. NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.
The PEM data from the GUVI conjunction periods may be found at
http://wwwpem.space.swri.edu/guvi-pem.html.
*Beginning of power orbit day (PEM activation): array current >5 amps, array
voltage >53.5 volts, and battery current >2.0 amps.
End of power orbit day (PEM deactivation): time in power orbit day >4 minutes,
array current <9 amps, and battery currents <0.2 amps.
Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta.
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HALOE
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Nothing received.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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Nothing received.
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MPG
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The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.
Daily processing of instrument Daily Activity Plans continues
with no problems.
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CDHF
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Nothing recieved.
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FOT
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REPORTING PERIOD
This report covers 13 December 2003 (Orbit 67044, GMT Day 347) through
19 December 2003 (Orbit 67148, GMT Day 353).
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
SUSIM 347/1813 67055 Power On
HRDI 348/0641 67063 Reboot
SOLSTICE 348/1200 67066 Power On (Fulltime)
PEM 348/1621 67069 Day Only
HALOE 349/1338 67082 Power On
The beta angle ranged between the angles of 2.0 degrees to 33.2
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 80 degrees on 01 January 2004 (DOY 001).
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 23.6 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 0.63 to 0.94 degrees C. Additional
battery performance data for each battery on 12 December and 19
December 2003 are provided in Appendix D.
The clock error ranged from 10.4 to -3.1 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.
OUT-OF-LIMITS = 00
ALERTS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT = 02
SUSIM = 02
HALOE = 02
SOLSTICE = 01
PEM = 01
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 06
Five (5) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Four (4) operational support problems occurred this period. Anomaly
Reports are included in Appendix E.
The data loss calculations are no longer being supplied by Data
Capture Facility (DCF).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The three new desktops have been created at JPL to support the three
possible configurations needed for UARS DSN events. Now that these
desktops have been made, another spacecraft test has been scheduled
for 30 December 2003.
The FOT continued to investigate the large attitude errors seen on the
simulator during each run of the day-in-the-life (DITL). The power
issues that caused the attitude to diverge were corrected but
subsequent runs still showed the spacecraft (on the simulator) lose
control. More analysis is needed to determine the reason behind the
large errors. This problem needs to be resolved so that the DITL
testing can continue.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 20 January 2004 (DOY 020).
This maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
Attachments: Appendix A, Real-time Command 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 19 December 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
67044 347/0104 03-307 MPS BATSOC
67049 347/0837 03-308 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
67055 347/1813 03-309 SUSIM POWER ON (PART 1)
67063 348/0641 03-313 HRDI REBOOT
67066 348/1200 03-314 SOLSTICE DAY-ONLY TO FULLTIME
67067 348/1256 03-310 SUSIM POWER ON (COMPLETE)
67069 348/1621 03-311 PEM ZEPS/HEPS DAY-ONLY
67082 349/1338 03-312 HALOE POWER ON (PART 1)
67085 349/1810 03-315 HALOE POWER ON (COMPLETE)
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 19 December 2003
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
-None this report period.
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 19 December 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
67049 347/0837 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 19 December 2003
12 December 2003 - GMT Day 346 Beta = 06.1 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 -700.0/-700.0 -3.05/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-33.6 +5.46/+4.50 +28.4/-13.2 26.4 1.020 19.9
3 +16.8/-44.8 +4.50/+3.23 +27.2/-12.8 26.4 1.020 19.2
19 December 2003 - GMT Day 353 Beta = 33.2 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 -700.0/-700.0 -3.05/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-16.8 +5.46/+4.50 +28.4/-13.6 25.0 1.030 20.6
3 +16.8/-22.4 +4.50/+3.87 +27.6/-13.6 24.8 1.020 20.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 19 December 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-057 ATC 67044 347/0100 N/A S/W Stored Cmd Error
03-058 HRDI 67059 348/0101 N/A Not accepting loads
03-055 FOT 67091 350/0314 30832 Generic Late Acquisition
03-055 FOT 67094 350/0829 30832 Generic Late Acquisition
03-059 FOT 67098 350/1515 34541 TDRSS East MA Problem
03-055 FOT 67141 353/1102 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-055 FOT See List Dec 03 30832 Generic Late Acquisition
03-056 FOT 66992 343/1259 34488 Data Drops
03-057 ATC 67044 347/0100 N/A S/W Stored Cmd Error
03-058 HRDI 67059 348/0101 N/A Not accepting loads
03-059 FOT 67098 350/1515 34541 TDRSS East MA Problem