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UARS WEEKLY STATUS REPORT - 15 Feb 2002
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods. This week we performed a coordinated
experiment with the SEE instrument on TIMED.
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SUSIM
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SUSIM performed its daily mid-resolution and MgII solar scans
during periods of predicted UARS telemetry.
Most backlogged level 0 data from December and January has now been
delivered from the PACOR-A system. Most of these days have been
processed to level 3AS using the RSS system on the SUSIM RAC.
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ACRIM
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Nothing received.
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PEM
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A detailed review of the PEM CICEL PROCs were conducted. 10 of 51 PROCs
were found to be missing. These need to be included in the CECIL conversion.
Of the 41 remaining PROCs, 39 of the CECIL PROCs were modified. PEM has
resubmitted the 39 CECIL PROCs and is waiting for the 10 missing CECIL PROCs
to be sent to PEM for review. PEM would like to know if the instrument
activation STOL procedures archived in the FOT are to be converted by GSFC.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
PEM awaits support of the UARS Traceability Mission for the TIMED mission.
Initial meetings with a GUVI team representative have highlighted the need
for knowledge of conjunction periods. Investigation is underway into
identifying times when the PEM spectrometers and the GUVI view plane are
sampling from the same volume of the atmosphere.
*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 participated in the UARS Ground System
Rehost Meeting on 14 February 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 02 February 2002 (Orbit 56838, GMT Day 033) through
08 February 2002 (Orbit 56943, GMT Day 039).
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
SUSIM 033/0026 56838 Power OFF
SUSIM 037/1206 56905 Power ON (start)
SUSIM 038/0523 56916 Power ON (completed)
HALOE 039/0005 56928 Power ON, part 1
HALOE 039/1024 56934 Power ON complete
A Reverse-to-Forward Yaw Around maneuver (number 106) was successfully
executed in Orbit 56250 beginning 035/01:01:57Z and completing at
035/01:39:07Z on 04 February 2002. The SOLSTICE instrument was in day
only and all other instruments were in their off or standby mode
(including HRDI and PEM). Due to the SA position at 269 degrees, the
effective night length of the spacecraft after the maneuver was
approximately 57.1 minutes. Post maneuver analysis of data indicate
that during the Yaw Around, the end-of-night load bus voltage was
23.88 volts and the average depths of discharge (DODs) on Batteries 2
and 3 were approximately 21.85 and 21.49 percent respectively. The
next (forward-to-reverse) YAW is scheduled for 08 March 2002 (DOY
067).
The beta angle ranged between the angles of 6.31 degrees to 17.65
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 08 March 2002 (DOY 067).
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 23.52 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 1.31 degrees C. Additional
battery performance data for each battery on 02 February 2002 and 08
February 2002 are provided in Appendix D.
The clock error ranged from -11.0 to 11.6 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 = 03
ALERTS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT = 11
SOLSTICE = 3
SUSIM = 3
HALOE = 2
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 1
SOLSTICE = 1
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: 02/002 - 2287.498845
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
As scheduled the first load was sent to UARS from the Eclipse system
on 06 February 2002. The load sent was a partial table load without
checksum. The load worked properly and was verified in telemetry.
On 07 February 2002 a stored command load was sent to UARS from
Eclipse. The command load and its corresponding time tags were sent
along with the safety loads. All of these loads performed as expected
and the spacecraft executed this stored command load correctly. RTS
and ephemeris loads are scheduled to be sent next week.
MEETINGS
The FOT attended a UARS CECIL PROC Review on Thursday, February 07,
2002.
The FOT attended a UARS Eclipse Working Meeting on Thursday, February
07, 2002.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 08 March 2002 (DOY 067). 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 08 February 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
56838 033/0026 02-031 SOLSTICE TO DAY OPS ONLY
56838 033/0026 02-032 SUSIM Power OFF
56841 033/0533 02-033 OBC/CLK Clk Adj -20.6 to 0.00 msec/day
56863 034/1624 02-034 MACS YAW MANUEVER SCRIPT
56867 034/2230 02-035 OBC GENASCII TABLE-37/SSPP NOOPS
56867 034/2230 02-036 OBC SSPP NOOPS / XMTR OFF CMD
56868 035/0030 02-035 OBC GENASCII TABLE-37/SSPP NOOPS
56869 035/0206 02-038 OBC GENASCII TABLES 53 & 37
56869 035/0206 02-039 OBC GENASCII TABLES 63 & 64
56871 035/0523 02-040 OBC CLEAR EXEC STATUS REPORTS
56883 036/0050 02-041 SOLSTICE MODE BACK TO DAY ONLY
56900 037/0335 02-042 SOLSTICE TO FULL TIME
56905 037/1206 02-043 SUSIM Power ON (start)
56909 037/1722 02-044 OBC GENASCII TABLE-16
56916 038/0523 02-043 SUSIM Power ON (completed)
56924 038/1722 02-045 ECLIPSE ATC LOAD TO TEST ECLIPSE
56928 039/0005 02-046 HALOE Power ON, part 1
56928 039/0047 02-047 OBC Clk Adj fr 0.00 to -20.6 msec/day
56934 039/1024 02-048 HALOE Power ON complete
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 08 February 2002
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
CDUNRG28 Y-LO Unregulated 28 V 56935
OBSVLBEON Y-LO Load Bus Voltage EON 56935-6
OBSBATVEON3 Y-LO Battery 3 Voltage at EON 56935-6
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
____________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 08 February 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
56841 033/0533 Clk Adj -20.6 to 0.00 msec/day
56928 039/0047 Clk Adj fr 0.00 to -20.6 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 08 February 2002
02 February 2002 - GMT Day 033 Beta = 6.31 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 -44.8/-67.2 -3.77/-4.99 +0.0/ -0.0 10.72 0.000 0.00
2 +00.0/-95.2 +5.14/+4.48 +28.8/-12.8 25.76 1.030 20.62
3 +22.4/-11.2 +3.82/+2.85 +28.0/-12.8 25.76 1.030 20.16
08 February 2002 - GMT Day 039 Beta = 17.65 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 -44.8/-67.2 -3.16/-4.38 +0.0/ -0.0 10.72 0.000 0.00
2 +11.2/-67.2 +6.47/+5.47 +30.0/-15.2 23.68 1.030 23.30
3 +22.4/-22.4 +5.14/+4.48 +29.2/-15.2 23.52 1.030 22.95
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 08 February 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-003 FOT 56864 034/1754 24205 YAW Commands Absent
02-004 SOLSTICE 56883 036/0050 N/A Solstice in Wrong Mode
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-003 FOT 56864 034/1754 24205 YAW Commands Absent
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