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UARS WEEKLY STATUS REPORT - 24 May 2002
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SOLSTICE
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SOLSTICE continues under day only operations due to low power
conditions. We are performing default solar observations during this
time. The current schedule has us back to full time operations on May
26.
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SUSIM
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SUSIM was turned off on 21 May to conserve power during the yaw-around
maneuver. Otherwise, its daily mid-resolution and MgII solar scans
successfully performed during periods of predicted UARS telemetry.
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ACRIM
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Nothing received.
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PEM
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PEM wishes to thank the SUSIM team for producing UARS attitude files.
The PEM team was able to up-load these data to CDHFB:: and generate the PEM
O/A subset information which is allowing PEM data from greater than 30 keV
electrons and protons to be correctly generated.
PEM support of the UARS Traceability Mission for the TIMED mission has
been organized with the GUVI team. PEM data was collected from April 18
through April 24. During this time period, there were two spacecraft contacts.
Early PEM data from the contact times showed no aurora. No significant aurora
appeared at the predicted highest invariant latitudes; however, lower invariant
latitude passes did show significant aurora. It appears as though magnetic
activity increased at times when UARS was not at its peak invariant latitudes
and some of the particle precipitation activity was captured by the PEM
instrumentation. PEM wishes to thank Bob Neff and Rich Beck at GSFC for their
efforts in retriving as much of the PEM data as possible.
Currently, PEM specific orbit/attitude and high energy particle data is
being processed for the GUVI-PEM Traceability study. Evaluation of PEM data
and spacecraft locations will need to be assimilated. These data are generated
so that the PEM data may be mapped on to GUVI images. Currently, a selected
set of PEM images for electrons less than 30 keV showing auroral activity may
be found at "http://pemrac.space.swri.edu/guvi-pem.html". Magnetometer DC Bz
and AX Bx are shown to aid in identifying the point of highest invariant
latitude. The solar array current and voltage are shown to aid in determining
when the spacecraft is in sunlight. Data from high-energy electrons
(30 keV < E < 5 MeV) and protons (45 keV < E < 150 MeV) as well as orbit data
are being generated and will be posted on the web page as they are generated.
PEM has provided input to the "Operations Agreement (OA) Between the
Packet Processor-Automation (Pacor-A) and Particle Environment Monitor (PEM)
for Upper Atmosphere Research Satellite (UARS)". This document is part of the
Consolidated Space Operations Contract.
PEM is working with the GUVI team to identify a second time period for
coordinated measurements. Early predictions show the best time of conjunction
is just after the UARS YAW at the end of June. The orbital conditions are
different from the first period and the TIMED-UARS orbits are nearly
perpendicular at this time.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
*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 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 11 May 2002 (Orbit 58310, GMT Day 131) through 17
May 2002 (Orbit 58415, GMT Day 137).
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 131/0358 58312 POWER OFF
HALOE 131/1459 58319 POWER ON / POWER OFF
HALOE 131/1557 58320 POWER ON
WINDII 135/1453 58379 POWER OFF
The beta angle ranged between the angles of 52.0 degrees to 23.6
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 23 May 2002 (DOY 143).
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 0.96 to 1.04 degrees C. Additional
battery performance data for each battery on 10 May and 17 May 2002
are provided in Appendix D.
The clock error ranged from -9.8 to 9.8 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
WINDII = 08
HALOE = 03
SUSIM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 1
Five (5) Anomaly Reports remained OPEN at the end of this report
period (see Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 01/333 - 2287.496855
Transponder B: 02/043 - 2287.498879
GROUND SYSTEM OPERATION
Zero (0) 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 FOT is in the process of implementing some minor changes to the
Eclipse system to help optimize operations. All of the existing
documentation is also in the process of being updated to reflect the
new ground system nomenclature. A few new SOPs have yet to be
written, while the handful that have already been written need to be
finalized and signed off on. A new release of the Eclipse software is
scheduled for the end of the month, which should take care of most of
the changes needed.
MEETINGS
None this report period.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 23 May 2002 (DOY 143). This
maneuver will be a Forward to Reverse Flight maneuver (Northern
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 17 May 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
58311 131/0218 02-169 HALOE HALOE AZ
58312 131/0358 02-167 HALOE POWER OFF
58314 131/0620 02-170 OBC/CLK CLK ADJ 0.0 TO 20.6 MSEC/DAY
58319 131/1459 02-171 HALOE POWER ON / POWER OFF
58320 131/1557 02-171 HALOE POWER ON
58334 132/1457 02-172 OBC/CLK CLK ADJ 20.6 TO 0.0 MSEC/DAY
58347 133/1053 02-173 WINDII WINDII ERROR FIX (E04 ERROR CODE)
58347 133/1053 02-173 WINDII WINDII ERROR FIX (E04 ERROR CODE)
58349 133/1554 02-173 WINDII WINDII ERROR FIX (IN SAFE MODE)
58351 133/1736 02-174 WINDII WINDII RESET
58353 133/2108 02-175 WINDII WINDII ERROR FIX (IN HALT MODE)
58363 134/1053 02-176 WINDII WINDII HALT & RESUME
58363 134/1412 02-177 WINDII CLEAR TMON/OBC EXEC STATUS ERROR
58366 134/1735 02-176 WINDII WINDII HALT & RESUME
58377 135/1050 02-178 WINDII WINDII CMDS
58379 135/1410 02-179 WINDII WINDII CMDS
58379 135/1453 02-180 WINDII POWER OFF
58382 135/1922 02-181 SUSIM SUNRISE FIX
58397 136/1921 02-181 SUSIM SUNRISE FIX
58412 137/1921 02-181 SUSIM SUNRISE FIX
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 17 May 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 17 May 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
58314 131/0620 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
58334 132/1500 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 17 May 2002
10 May 2002 - GMT Day 130 Beta = 54.0 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/-4.62 +0.0/ +0.0 0.0 0.000 0.0
2 +11.2/ -33.6 +4.61/+2.92 +23.2/-15.1 28.2 1.020 18.1
3 +22.4/ -33.6 +3.87/+1.97 +22.4/-14.8 28.2 1.020 17.7
17 May 2002 - GMT Day 137 Beta = 23.6 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 -3.58/-4.52 +0.0/ +0.0 0.0 0.000 0.0
2 +11.2/ -51.6 +5.15/+3.87 +27.7/-13.5 25.1 1.030 20.6
3 +22.4/ -33.6 +3.87/+2.92 +26.7/-13.5 25.1 1.020 20.1
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 17 May 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-028 FOT 58377 135/1050 24334 Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-026 FOT See List May 01 N/A Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
02-004 SOLSTICE 56883 036/0050 N/A Solstice in Wrong Mode
02-023 FOT 57767 094/2027 24285 Early LOS on OMNI Pass
02-024 FOT 57783 095/2209 24285 SOLSTICE INOPS in Day
02-027 FOT 58202 123/1931 24324 Late Acquisition
02-028 FOT 58277 128/2004 24331 Late Acquisition - 4:02