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UARS WEEKLY STATUS REPORT - 25 JAN 2002
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods. We are prepared for closed loop
SSPP tracking expected to begin on January 30th.
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SUSIM
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SUSIM completed daily mid resolution and MgII solar scans during
periods of predicted UARS telemetry. We are awaiting the corrected
level 0 data from the PACOR-A system. On a positive note, we have
been able to successfully download cataloged files from the former
CDHF.
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ACRIM
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Nothing received.
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PEM
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PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
An initial review of the PEM CICEL PROCs were conducted. Comments have
been submitted. The converted STOL procedures are not acceptable for use at
the current time.
PEM awaits support of the UARS Traceability Mission for the TIMED mission.
*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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HALOE continues to acquire its data as scheduled. The processing of scans
acquired since November will commence shortly on the Remote Analysis
Computer (RAC) at Langley. Those data will be posted initially through
the HALOE Website.
One problem remains with our present adaptation of the operational
software and the processing from the Level 0 files. Whenever a HALOE
sunrise or sunset scan event crosses the day boundary, the UARS Orbit
and Attitude Services (UOAS) software must open and access two definitive
orbit files because these are 24hr files. It accesses the current processing
day file but bombs when accessing the next day file.
It is worth noting that we have never before used the UOAS software
outside of the CDHF computer environment. At CDHF the processing is done
either in an 'Engineering Mode' or a 'Production Mode', and in both cases
the HALOE software is linked with a 'blackbox' of libraries which consists of
the UOAS and UCSS, among other things. What is necessary to process the data
at Langley is to adapt these libraries to perform the same functions on
our RAC. We have always had the UCSS library on our RAC (though for
terminology confusion it is called an RSS library locally) or we would not
have been able to run Level 1 or Level 2 at Langley. To do
the Level 0 processing at Langley, we now have to add the UOAS library
which has dependence on our RAC RSS library; the problem is most likely
with this new dependence.
If anyone from the other instrument teams can offer some insight about how to
overcome this problem, please contact Lance Deaver (or Ellis Remsberg) of the
HALOE Project. In the meantime we will perform a 'work around', losing at
most one event on those days when it straddles the day boundary.
This represents a loss of one scan out of, perhaps, 26 for that day.
We anticipate being able to process data in support of the Traceability Option
for the TIMED and SAGE III satellite experiments in the coming weeks.
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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 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 January 2002 (Orbit 56523, GMT Day 012) through
18 January 2002 (Orbit 56627, GMT Day 018).
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
WINDII 014/2325 56567 Power OFF
The beta angle ranged between the angles of 73.67 degrees to 68.63
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 03 February 2002 (DOY 034).
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 26.72 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.25 to 0.94 degrees C. Additional
battery performance data for each battery on 22 December 2001 and 28
December 2001 are provided in Appendix D.
The clock error ranged from –11.6 to 13.0 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 = 8
PEM = 1
WINDII = 1
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 2
One (1) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 01/333 - 2287.496855
· Transponder B: 01/324 - 2287.498688
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). This service should resume soon.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
More realtime tests were executed on the Eclipse system this week.
The FOT now routinely takes two passes a day with the Eclipse system.
These passes are merely telemetry passes with only NOOPs sent for
commands. All loading and other spacecraft commanding is still being
done with the legacy AP system. A new delivery of the Eclipse
software is expected on 25 January 2002, which will include command
load capability. This will be the focus of testing for the week
subsequent to that date (with the simulator).
MEETINGS
The FOT attended a UARS Ground System Rehost Meeting on Monday,
January 14, 2002.
The FOT attended a UARS Eclipse Working Meeting on Thursday, January
17, 2002.
The FOT attended a UARS Flight Software Meeting on Friday, January 18,
2002.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 03 February 2002 (DOY 034).
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 January 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
56547 013/1603 02-010 OBC Clk Adj fr 41.2 to 20.6 msec/day
56563 014/1644 02-011 CDH Eclipse cmd test
56567 014/2325 02-012 WINDII Power OFF
56574 015/1046 02-013 OBC Clk Adj fr 20.6 to 41.2 msec/day
56578 015/1644 02-015 CDH Eclipse cmd test
56579 015/1826 02-014 PEM ZEPS/HEPS Fulltime
56580 015/2005 02-015 CDH Eclipse Cmd Test
56617 018/0717 02-016 OBC/CLK Clk Adj fr 41.2 to 20.6 msec/day
56623 018/1643 02-018 CDH ECLIPSE TEST CMDS
56625 018/2002 02-018 CDH ECLIPSE TEST CMDS
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 18 January 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 January 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
56547 013/1603 Clk Adj fr 41.2 to 20.6 msec/day
56574 015/1046 Clk Adj fr 20.6 to 41.2 msec/day
56617 018/0717 Clk Adj fr 41.2 to 20.6 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 18 January 2002
12 January 2002 - GMT Day 012 Beta = 73.67 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 -504.0/-672.0 -2.85/-3.77 +0.0/ -0.0 10.72 0.000 0.00
2 000.0/-224.0 +2.42/+2.20 +16.0/-12.8 27.52 1.050 13.17
3 +224.0/-112.0 +1.88/+1.23 +15.6/-12.8 27.52 1.040 12.93
18 January 2002 - GMT Day 018 Beta = 68.63 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 -560.0/-728.0 -3.16/-3.77 +0.0/ -0.0 10.72 0.000 0.00
2 +056.0/-224.0 +3.17/+2.52 +18.8/-14.4 26.88 1.040 15.85
3 +224.0/-112.0 +2.52/+1.88 +18.4/-14.4 26.72 1.040 15.38
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 18 January 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-001 FOT 56577 015/1600 N/A TAC/AP Crashed
02-002 FOT 56592 016/1559 14170 Generic Late
Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-001 FOT 56577 015/1600 N/A TAC/AP Crashed
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-002 FOT see list Jan 02 14170 Generic Late Acquisition