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UARS WEEKLY STATUS REPORT - 25 OCT 2002
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SOLSTICE
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Nothing received.
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SUSIM
***********
Nothing received.
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ACRIM
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Nothing received.
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PEM
***********
The PEM web site has moved; it has a new URL. Access the PEM web site
is now through http://wwwpem..space.swri.edu. The PEM data from the GUVI
conjunction periods has moved to http://wwwpem..space.swri.edu/guvi-pem.html.
PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period. Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.
GUVI images from other times from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present. Separation
is several minutes to 10's of minutes when both instruments saw aurora. A
presentation will be made at the November American Meteorological Society
meeting on PEM's view of the first conjunction period. The title is "April
18-24, 2002: PEM Observations of Atmospheric Energy Input and Ionization
Rates determined from Precipitating Charged Particles". PEM has seen no aurora
during the second conjunction period.
PEM data for a third GUVI-PEM conjunction has been planned. This time
period is October 27. Orbit analysis shows that conjunctions will occur
between TIMED and UARS at 11:03 UT (IL = 65 deg, MLT = 20 hr, GeoLat = -51 deg,
GeoLon = 132 deg) and 11:50 UT (IL = 61 deg, MLT = 8 hr, GeoLat = 52 deg,
GeoLon = 295 deg).
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.
*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.
The UARS spacecraft experience an on-board computer halt on
22 October 2002. The MPG has been assisting the FOT as
needed while normal operation of UARS is being restored.
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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
***********
The MPG continues to serve as the point-of-contact for UARS
instrument operations to support re-engineering of the UARS
Mission Operations Concept to develop capabilities for the
Science Traceability Mission.
Daily processing of instrument Daily Activity Plans continues
with no problems.
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CDHF
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 12 October 2002 (Orbit 60624, GMT Day 285)
through 18 October 2002 (Orbit 60728, GMT Day 291).
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 286/1612 60649 POWER ON
PEM 287/1243 60662 POWER ON HEPS/NEPS
SOLSTICE 288/1241 60677 POWER ON
SUSIM 288/1611 60679 POWER ON
WINDII 289/1505 60694 POWER ON
WINDII 289/1801 60695 POWER OFF
The beta angle ranged between the angles of 5.8 degrees to 34.9
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 71 degrees on 31 October 2002 (DOY 304).
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 0.95 to 0.96 degrees C. Additional
battery performance data for each battery on 11 October and 18 October
2002 are provided in Appendix D.
The clock error ranged from -2.6 to 10.2 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
HALOE = 02
PEM = 01
SOLSTICE = 02
SUSIM = 01
WINDII = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Three (3) Anomaly Report remained OPEN at the end of this report
period (see Appendix E).
GROUND SYSTEM OPERATION
Two (2) 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 new hard disk on the prototype was installed as well as the new
build of the Eclipse software. Once the testing of this new build is
complete the software will be released for operations. This will most
likely not take place until the ERBS integration is complete.
The FOT is also working hard in preparation for the college students
that will be in the control center to learn about spacecraft
operations. The FOT will try to formulate training materials and
structure a learning plan to teach the students. This is all part of
the new Educational Outreach initiative/contract, which started on 01
October 2002 for both UARS and TOMS. The students will begin working
in the control center on 21 October 2002
MEETINGS
The FOT attended a meeting on 14 October 2002 to discuss the
FOT's plan for training the students.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 18 November 2002 (DOY 322).
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 18 October 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
60626 285/0313 02-354 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
60649 286/1612 02-355 HALOE POWER ON PT. 1
60652 286/2125 02-356 HALOE POWER ON PT. 2
60662 287/1243 02-357 PEM POWER ON HEPS/NEPS
60677 288/1241 02-358 SOLSTICE POWER ON
60678 288/1424 02-359 SOLSTICE POWER ON
60679 288/1611 02-360 SUSIM POWER ON (PART-1)
60691 289/1108 02-361 NBTR NBTR RE-CONFIG
60692 289/1108 02-360 SUSIM POWER ON COMPLETED
60694 289/1505 02-362 WINDII POWER ON
60695 289/1801 02-363 WINDII POWER OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 18 October 2002
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 18 October 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
60626 285/0320 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 18 October 2002
11 October 2002 - GMT Day 284 Beta = 04.5 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 -145.6/-168.0 -3.68/-4.63 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-33.6 +5.46/+4.50 +28.8/-13.6 26.2 1.020 20.3
3 +22.4/-33.6 +3.87/+3.23 +27.2/-13.2 26.1 1.020 19.6
18 October 2002 - GMT Day 291 Beta = 34.9 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 -151.2/-173.6 -3.68/-4.63 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-72.8 +4.82/+3.87 +27.2/-14.4 25.6 1.020 19.8
3 +22.4/-22.4 +3.87/+2.91 +26.8/-14.4 25.4 1.020 19.2
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
- None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 18 October 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-053 FOT 60630 285/1008 30382 GENERIC LATE ACQUISITION
02-054 FOT 60689 289/0819 31607 FORWARD FAIL-OVER AT WHITESAND
20 SEC RTD lost, non-recover
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-052 SOLSTICE 60366 267/1951 N/A LOADING PROBLEM
02-053 FOT 60630 285/1008 30382 GENERIC LATE ACQUISITION
02-054 FOT 60689 289/0819 31607 FORWARD FAIL-OVER AT WHITESAND
20 SEC RTD lost, non-recover