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UARS WEEKLY STATUS REPORT - 02 May 2003
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and occultation scans this past week during periods of UARS
telemetry. The solar pointing provided by the SSPP in closed loop
pointing mode has been superb.
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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 19 April 2003 (Orbit 63465, GMT Day 109) through 25
April 2003 (Orbit 63570, GMT Day 115).
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 110/0021 63480 POWER OFF
PEM 110/1406 63489 AXIS 1 POWER ON
The beta angle ranged between the angles of 55.1 degrees to 69.8
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 70 degrees on 26 April 2003 (DOY 116).
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 1.26 to 1.27 degrees C. Additional
battery performance data for each battery on 18 April and 25 April
2003 are provided in Appendix D.
The clock error ranged from -7.2 to 10.3 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 = 01
WINDII = 01
HALOE = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 04
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
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 ground system problems experienced last weekend have prompted the
replacement of UARS CISCO switch one. This will be performed on
Tuesday of next week, with the existing switch 2 left in place. This
should eliminate the problems that were seen regarding the bad ports
and provide more stability to the UARS network.
The FOT also received the delivery of both the WAIT statement fix and
the status buffer code. This code will be installed on the prototype
after the switch is replaced. Once installed it should only take a
day to test the functionality and report back to the Raytheon
sustaining engineering team.
The tape drive that was also found to be malfunctioning last week has
also been replaced. This means that the backups of the ground system
files can resume. New software is also on order to make these backups
more reliable and should be installed sometime in the next three
weeks.
MEETINGS
The FOT attended the weekly UARS DRB on 22 April 2003, 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 16 May 2003 (DOY 136). This
maneuver will be a Forward to Reverse 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 25 April 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63480 110/0021 03-096 HALOE POWER OFF
63487 110/1040 03-097 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
63489 110/1406 03-098 PEM AXIS 1 POWER ON
63563 115/1211 03-099 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
63565 115/1503 03-100 WINDII CLEAR ERROR CODE E03
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 25 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 25 April 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63487 110/1045 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
63563 115/1215 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 25 April 2003
18 April 2003 - GMT Day 108 Beta = 48.9 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 -190.4/-224.0 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-145.6 +5.47/+3.55 +25.2/-15.2 25.4 1.040 20.0
3 +22.4/-44.8 +4.51/+2.92 +24.8/-15.2 25.4 1.030 19.8
25 April 2003 - GMT Day 115 Beta = 69.8 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 -207.2/-229.6 -3.05/-3.99 +00.0/+00.0 08.3 0.000 0.0
2 +05.6/-22.4 +3.23/+1.97 +16.8/-15.2 26.4 1.060 16.3
3 +16.8/-22.4 +2.60/+1.34 +16.8/-15.2 26.4 1.050 16.1
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 25 April 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-015 FOT 63493 110/2015 30832 Generic Late Acquisition & WS
Reboot
03-016 FOT 63505 111/1550 NA Server 1 Tape Drive Install
03-011 FOT 63565 115/1541 30832 Generic Late Acquisition
03-011 FOT 63569 115/2225 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-013 FOT 63368 102/1340 NA Eclipse Network Issues
03-011 FOT See List April 03 30832 Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
03-015 FOT 63493 110/2015 30832 Generic Late Acquisition& WS
Reboot
03-016 FOT 63505 111/1550 NA Server 1 Tape Drive
Install