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UARS WEEKLY STATUS REPORT - 10 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.
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SUSIM
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SUSIM successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.
The SSPP in closed loop pointing mode has been performing
superbly. Not only has it dramatically reduced the needed
pointing correction in current data, it has significantly improved
our pointing corrections for earlier irradiance data.
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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.
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 attended the UARS Battery Status Review Meeting
on 9 May 2002.
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 27 April 2002 (Orbit 58100, GMT Day 117) through 03
May 2002 (Orbit 58204, GMT Day 123).
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 117/0237 58101 HALOE POWER OFF
HRDI 122/1432 58184 HRDI TO LOW POWER MODE
The beta angle ranged between the angles of 53.74 degrees to 72.6
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 0.95 to 0.96 degrees C. Additional
battery performance data for each battery on 26 April and 03 May 2002
are provided in Appendix D.
The clock error ranged from -10.3 to 11.5 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 = 05
SUSIM = 02
WINDII = 01
HALOE = 01
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 4
Four (4) 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
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 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 discussion regarding the UARS power issues was held at the UARS
Monthly meeting on 02 May 2002. Further discussion and data is needed
before a decision will be made. A follow up meeting will be held on
09 May 2002.
MEETINGS
The FOT attended the UARS Monthly Meeting on 02 May 2002.
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 03 May 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
58101 117/0237 02-148 HALOE POWER OFF
58113 117/2203 02-149 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
58134 119/0640 02-150 SUSIM SUSIM CMDS
58134 119/0738 02-152 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
58135 119/0918 02-151 SUSIM SUSIM CMDS
58138 119/1248 02-151 SUSIM SUSIM CMDS
58139 119/1435 02-147 WINDII WINDII RESET ERR E06
58145 120/0048 02-147 WINDII WINDII RESET ERR E06
58148 120/0556 02-153 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
58160 121/0048 02-147 WINDII WINDII RESET ERR E06
58175 122/0048 02-147 WINDII WINDII RESET ERR E06
58178 122/0553 02-154 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
58184 122/1432 02-155 HRDI POWER LOW POWER MODE
58187 122/1932 02-156 OBC STATBUF DUMP
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 03 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 03 May 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
58113 117/2205 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
58134 119/0738 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
58148 120/0602 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
58178 122/0612 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 03 May 2002
26 April 2002 - GMT Day 116 Beta = 53.74 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 -3.16/-4.38 +0.0/ +0.0 0.0 0.000 0.0
2 +11.2/-100.8 +5.14/+3.87 +24.0/-15.2 24.8 1.040 20.2
3 +22.4/-56.0 +3.87/+2.91 +24.0/-15.2 24.8 1.040 19.9
03 May 2002 - GMT Day 123 Beta = 72.6 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 -3.16/-4.38 +0.0/ +0.0 0.0 0.000 0.0
2 +11.2/-44.8 +2.60/+1.65 +16.8/-14.8 23.5 1.110 13.7
3 +15.5/-44.8 +1.97/+1.02 +16.0/-14.8 23.4 1.110 13.5
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 03 May 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-026 FOT 58172 121/2016 14170 Generic Late Acquisition
02-026 FOT 58192 123/0307 14170 Generic Late Acquisition
02-026 FOT 58195 123/0954 14170 Generic Late Acquisition
02-027 FOT 58202 123/1931 24324 Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-025 FOT See List Apr 13 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