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UARS WEEKLY STATUS REPORT - 09 MAY 2003
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SOLSTICE
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Nothing received.
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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 26 April 2003 (Orbit 63571, GMT Day 116) through 02
May 2003 (Orbit 62675, GMT Day 122).
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
HRDI 119/0113 63616 FULLTIME OPERATIONS
PEM 122/2321 63675 POWER OFF AXIS 1
The beta angle ranged between the angles of 70.3 degrees to 55.8
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 16 May 2003 (DOY 136).
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 0.63 to 0.95 degrees C. Additional
battery performance data for each battery on 25 April and 02 May 2003
are provided in Appendix D.
The clock error ranged from -11.3 to 7.0 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
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 04
Four (4) 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 new switch was installed on 29 April 2003 and ran without incident
all week. This hardware fix has hopefully resolved the network issues
seen earlier this month.
The preliminary build, which contained the fixes for the wait
statement and status buffer display issues, was installed and tested
on 30 April 2003. Testing showed that the wait statement logic worked
properly for several operational procedures, but not with a test
procedure which waited for a rapidly incrementing counter to reach a
value. The status buffer still had several issues including, wrong
time stamp, trickle LRVS and status buffer dumps not updating the
display properly and old messages not being cleared properly. The FOT
has written up their test result and sent them to the Raytheon
development team for analysis.
MEETINGS
The FOT attended the weekly UARS DRB on 29 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 02 May 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63591 117/0841 03-101 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
63616 119/0113 03-102 HRDI FULLTIME OPS
63662 122/0246 03-103 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
63675 122/2321 03-104 PEM POWER OFF AXIS 1
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 02 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 02 May 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63591 117/0846 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
63662 122/0248 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 02 May 2003
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
02 May 2003 - GMT Day 122 Beta = 55.8 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 -235.2/-263.2 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +05.6/-67.2 +3.87/+2.92 +23.2/-15.2 25.8 1.030 18.8
3 +16.8/-44.8 +2.92/+1.97 +22.4/-14.4 25.6 1.020 18.4
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 02 May 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63576 116/0945 30832 Generic Late Acquisition
03-011 FOT 63622 119/0941 30832 Generic Late Acquisition
03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts
03-018 FOT 63648 121/0329 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT See List April 03 30832 Generic Late Acquisition
03-016 FOT 63505 111/1550 NA Server 1 Tape Drive Install
03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts
03-018 FOT See List May 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
------ ------ ----- ---- --- -----------------
03-011 FOT See List April 03 30832 Generic Late Acquisition
03-017 FOT 63647 121/0145 32718 Multiple Data Dropouts
03-018 FOT See List May 03 30832 Generic Late Acquisition