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UARS WEEKLY STATUS REPORT - 30 May 2003
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SOLSTICE
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During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods.
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SUSIM
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SUSIM has successfully gathered all of its daily mid resolution,
weekly offset, and O2 occultation scans this past week during
periods of UARS telemetry or during periods of onboard tape
recording.
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ACRIM
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Nothing received.
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PEM
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The PEM web site has moved. It has a new URL. Access the PEM web site
using http://wwwpem.space.swri.edu. The PEM data from the GUVI conjunction
periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html.
Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2001365 has been
reprocessed and archived at the GSFC DAAC. SwRI is working on reprocessing
data PEM for 2002.
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.
PEM has seen no aurora during the second conjunction period. Due to a
spacecraft anomaly, no PEM data was collected during the third conjunction
period.
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.
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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 in support of the Science Traceability
Mission of UARS.
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 17 May 2003 (Orbit 63886, GMT Day 137) through 23
May 2003 (Orbit 63991, GMT Day 143).
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
SOLSTICE 138/1318 63909 DAY ONLY TO FULL TIME
SUSIM 138/1604 63911 POWER ON
HALOE 141/1310 63954 POWER ON
PEM 143/1311 63985 POWER ON DAY ONLY
The beta angle ranged between the angles of 3.4 degrees to 31.2
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 35 degrees on 31 May 2003 (DOY 151).
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 0.64 to 0.65 degrees C. Additional
battery performance data for each battery on 16 May and 23 May 2003
are provided in Appendix D.
The clock error ranged from -8.8 to 10.1 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 = 03
SOLSTICE = 01
SUSIM = 01
HALOE = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 03
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Three (3) 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 successfully completed another UARS yaw maneuver on 16 May
2003. The VT-6 duration lasted for approximately two days, which is
one full day longer than the previous yaw maneuvers. The two-day
duration will be used for the remainder of the summer. After which an
analysis will have to be done to determine the duration needed for the
fall and winter yaw maneuvers. The duration may be scaled back or
left the same depending on the performance of the batteries throughout
the summer.
More eclipse testing of the status buffer functionality was done on 19
May 2003. All functionality worked properly except for the time value
on status buffer messages received in the blind. When these messages
are received the algorithm that determines the proper time has trouble
determining the last rollover time. This issue is being looked at but
the new build will be delivered with this problem unresolved.
MEETINGS
The FOT also attended the weekly UARS DRB on 20 May 2003, to review
the open DRs and discuss the details of the next Eclipse software
delivery. At this meeting the DR written about the derived equation
problem was raised to a severity one DR.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 14 June 2003 (DOY 165). 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 23 May 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63903 138/0221 03-117 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
63909 138/1233 03-118 MPS FROM VT 6 TO VT 5
63909 138/1318 03-119 SOLSTICE DAY ONLY TO FULL TIME
63911 138/1604 03-120 SUSIM POWER ON
63912 138/1642 03-121 MPS RESET BATTERY STATE OF CHARGE
63923 139/1133 03-120 SUSIM POWER ON (COMPLETE)
63954 141/1310 03-122 HALOE POWER ON
63959 141/1924 03-123 HALOE POWER ON (COMPLETE)
63985 143/1311 03-124 PEM POWER ON DAY ONLY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 23 May 2003
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 23 May 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63903 138/0221 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 23 May 2003
16 May 2003 - GMT Day 136 Beta = 01.5 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 -700.0/-700.0 -3.68/-4.94 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-100.8 +4.51/+3.87 +28.0/-13.2 26.2 1.020 21.0
3 +22.4/-44.8 +3.87/+2.60 +26.8/-12.8 26.2 1.010 20.0
23 May 2003 - GMT Day 143 Beta = 31.2 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 -700.0/-700.0 -3.05/-3.99 +00.0/+00.0 07.2 0.000 0.0
2 +00.0/-22.4 +5.15/+4.51 +11.2/-14.0 26.1 1.020 21.0
3 +11.2/-22.4 +3.87/+3.23 +11.2/-13.6 26.1 1.010 20.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
63909 138/1233 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 23 May 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-026 FOT 63922 139/0913 32822 White Sands Record Prob
03-018 FOT 63944 140/2109 30832 Generic Late Acquisition
03-018 FOT 63959 141/2007 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-019 FOT 63727 126/1008 N/A SEC Eclipse (PBK Problem)
03-022 FOT 63742 127/0929 N/A PBK PROBLEM(REF 03-019)
03-024 FOT 63852 134/1745 N/A Bad CISCO Switch No.2
03-025 FOT 63884 136/2016 32813 Data Dropout
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-018 FOT See List May 03 30832 Generic Late Acquisition
03-026 FOT 63922 139/0913 32822 White Sands Record Prob