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UARS WEEKLY STATUS REPORT - 06 JUN 2003
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SOLSTICE
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Nothing received.
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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.
Work around procedures were used to relay Sun Plans, TDRSS
schedules, Operation Scenarios, and some Daily Activity Plans
during a GSFC DECNET outage on May 26 and 27. Otherwise,
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 24 May 2003 (Orbit 63991, GMT Day 144) through 30
May 2003 (Orbit 64096, GMT Day 150).
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 144/1302 63999 POWER ON
WINDII 144/1736 64002 POWER OFF
PEM 145/1259 64014 POWER ON 7 WATTS
WINDII 149/1724 64077 POWER ON
WINDII 149/1947 64079 POWER OFF
The beta angle ranged between the angles of 23.5 degrees to 34.9
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 1.28 degrees C. Additional
battery performance data for each battery on 23 May and 30 May 2003
are provided in Appendix D.
The clock error ranged from -11.1 to 11.4 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 = 09
WINDII = 04
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
One (1) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) operational support problem 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 new build of Eclipse software (Build 2.0.2) was delivered to the
prototype system on 29 May 2003. FOT testing of this build began on
30 May 2003 and will continue through next week. Once testing has
been completed some parallel operations will be run before the build
is released for operations.
MEETINGS
The FOT attended the weekly UARS DRB on 27 May 2003, to review the
open DRs and discuss the details of the next Eclipse software
delivery.
The FOT also attended a UARS 3 TDRS Review Meeting. The purpose of
this meeting was discuss whether the 3 TDRS patch developed almost two
years ago could be implemented. All issues and concerns were raised
at the meeting from all entities involved. These issues will be
presented to the NASA Mission Director for a decision on whether or
not to proceed.
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 30 May 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63999 144/1302 03-125 WINDII POWER ON
64000 144/1409 03-126 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64002 144/1736 03-127 WINDII POWER OFF (DUE TO LOW POWER)
64014 145/1259 03-128 PEM/AXIS POWER ON 7 WATTS
64016 145/1552 03-129 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64021 145/2237 03-130 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64038 147/0208 03-131 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64040 147/0609 03-132 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64055 148/0607 03-133 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64057 148/0845 03-134 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64075 149/1301 03-135 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64077 149/1724 03-136 WINDII POWER ON
64079 149/1947 03-137 WINDII POWER OFF (DUE TO LOW POWER)
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 30 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 30 May 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
64000 144/1409 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64016 145/1552 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64021 145/2237 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64038 147/0208 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64040 147/0609 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64055 148/0607 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64057 148/0845 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64075 149/1301 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 30 May 2003
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
30 May 2003 - GMT Day 150 Beta = 34.9 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/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-106.4 +5.15/+4.51 +26.8/-14.4 25.4 1.020 19.8
3 +22.4/-33.6 +4.51/+3.23 +26.4/-14.0 25.4 1.020 19.6
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 30 May 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-018 FOT 64062 148/1725 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-026 FOT 63922 139/0913 32822 White Sands Record Prob
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