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UARS WEEKLY STATUS REPORT - 11 April 2003
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SOLSTICE
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This week, SOLSTICE was powered only during daylight for three days to
support the yaw maneuver. Otherwise, solar data were collected on all
available orbital tracking periods.
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SUSIM
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Nothing received.
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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 29 March 2003 (Orbit 63150, GMT Day 088) through 04
April 2003 (Orbit 63247, GMT Day 094).
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
PEM AXIS 090/0046 63180 POWER OFF
WINDII 091/0223 63196 POWER OFF
PEM 092/2151 63223 POWER OFF
HALOE 092/2334 63224 POWER OFF
The beta angle ranged between the angles of 37.0 degrees to 12.9
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 06 April 2003 (DOY 096).
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 1.27 to 1.28 degrees C. Additional
battery performance data for each battery on 28 March and 04 April
2003 are provided in Appendix D.
The clock error ranged from -9.9 to 10.4 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 = 02
PEM = 02
WINDII = 01
HALOE = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Three (3) Anomaly Report remained OPEN at the end of this report
period (see Appendix E).
GROUND SYSTEM OPERATION
One (1) 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 received results of the investigation at White Sands regarding
the 085/0554-0623 UTC event. Their investigation showed that the UARS
negative acquisition was do to a WSGT software problem. Their
software was apparently showing receipt of the GCMRs sent by the FOT,
but in reality it was not receiving them. This problem will be fixed
in the next software delivery scheduled for mid May to early June. In
the meantime, the FOT is aware of this problem and can respond
accordingly should the anomaly reoccur.
MEETINGS
The FOT attended the UAR Monthly Status review to report status of
significant events for the month of March.
The FOT also attended the weekly UARS DRB to review the open DRs and
discuss the details of the next Eclipse software delivery
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 06 April 2003 (DOY 096). 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 04 April 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63180 090/0046 03-077 AXIS POWER OFF
63196 091/0223 03-078 WINDII POWER OFF
63223 092/2151 03-079 PEM POWER OFF
63224 092/2334 03-080 HALOE POWER OFF
63230 093/0803 03-081 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
63248 094/1317 03-082 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 04 April 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 04 April 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63230 093/0803 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
63248 094/1317 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 04 April 2003
28 March 2003 - GMT Day 087 Beta = 40.6 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 -173.6/-201.6 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-112.0 +6.11/+4.83 +27.6/-15.6 24.2 1.030 21.1
3 +22.4/-67.2 +5.15/+3.87 +27.2/-15.6 24.0 1.020 20.9
04 April 2003 - GMT Day 094 Beta = 12.9 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 -179.2/-201.6 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-22.4 +4.51/+3.87 +26.8/-15.2 26.1 1.020 20.0
3 +22.4/-22.4 +3.23/+2.60 +25.6/-14.4 26.1 1.010 19.6
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 04 April 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63226 093/0216 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63226 093/0216 30832 Generic Late Acquisition
03-010 FOT 63108 085/0554 32514 No Acquisition (29
minutes)
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
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-011 FOT 63226 093/0216 30832 Generic Late Acquisition