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UARS WEEKLY STATUS REPORT - 26 SEP 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. This week we
received about 51% of each day's data amounting to about 450 minutes of
solar observing time per day.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and O2 occultation scans during periods of UARS telemetry or
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 2002179, and HEPSA
data between 2002230 and 2002239 has been reprocessed and archived at the GSFC
DAAC. HEPSA data files from 2002180 through 2002229 and 2002240 through 2002259
are processed and awaiting archiving at the DAAC.
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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A revised version of the UARS movie has been installed
on the UARS Science Web Page: http://umpgal.gsfc.nasa.gov
under "UARS Movies".
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 13 September 2003 (Orbit 65675, GMT Day 256)
through 19 September 2003 (Orbit 65780, GMT Day 262).
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
PEM 257/0004 65690 AXIS 1,2 TURN ON
PEM 262/2341 65780 AXIS 1 & 2 OFF
WINDII 262/2341 65780 POWER OFF
The beta angle ranged between the angles of 58.3 degrees to 55.2
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 03 October 2003 (DOY 276).
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 0.94 to 1.29 degrees C. Additional
battery performance data for each battery on 12 September and 19
September 2003 are provided in Appendix D.
The clock error ranged from -10.0 to 10.7 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 = 04
PEM = 03
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 03
Two (2) Anomaly Report 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 continues to move forward with the 3 TDRS implementation. The
FOT developed a timeline of all the activities that need to be
completed from all entities involved. The FOT also gathered
information and analyzed the effect of running the transponder and HGA
in order to support a third pass every orbit. The next step is to
being making the necessary database changes and then get the backup
CMS ready for testing.
MEETINGS
The FOT attended the UARS Biweekly DRB Meeting on 16 September 2003.
The FOT discussed the changes need from the Raytheon development team
to utilize a three TDRS mode of operations. These changes will be
made and should be delivered by the end of October.
The FOT attended the UARS Three TDRS Meeting on 18 September 2003. At
this meeting the FOT presented the proposed timeline and transponder
and HGA information. It was decided by the UARS Project Scientist and
the NASA Mission Director to continue to move forward with
implementing the three TDRS capability. The proposed timeline has
this activity scheduled for completion by mid to late November.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 03 October 2003 (DOY 276).
This maneuver will be a Forward to Reverse Flight maneuver (Northern
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 19 September 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65688 256/2035 03-246 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65690 257/0004 03-247 PEM AXIS 1,2 TURN ON (BEGIN)
65691 257/0138 03-247 PEM AXIS 1,2 TURN ON (COMPLETE)
65724 259/0606 03-248 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65751 261/0102 03-249 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65780 262/2341 03-250 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65780 262/2341 03-251 PEM AXIS 1 & 2 OFF
65780 262/2341 03-252 WINDII POWER OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 19 September 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 19 September 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
65688 256/2035 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65724 259/0609 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65751 261/0121 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65780 262/2345 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 19 September 2003
12 September 2003 - GMT Day 255 Beta = 56.6 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 -700.0/-700.0 -3.68/-4.94 +00.0/+00.0 07.2 0.000 0.0
2 +16.8/-33.6 +4.51/+2.92 +22.0/-15.2 26.1 1.030 18.6
3 +11.2/-56.0 +3.23/+1.97 +21.6/-14.4 26.1 1.020 17.7
19 September 2003 - GMT Day 262 Beta = 55.2 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 -3.68/-4.62 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-22.4 +4.51/+3.23 +23.2/-15.2 25.8 1.040 19.2
3 +16.8/-44.8 +3.23/+2.29 +22.4/-15.2 25.6 1.030 18.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 19 September 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-049 FOT 65723 259/0326 33745 Generic Drop out on the return
03-046 FOT 65765 261/2343 30832 Generic Late Acquisition
03-046 FOT 65770 262/0641 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-048 SOLSTICE 65573 249/0454 N/A SOLSTICE Rebooted
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
------ ------ ----- ---- --- -----------------
03-046 FOT See List Sept 03 30832 Generic Late Acquisition
03-049 FOT 65723 259/0326 33745 Generic Drop out on the return