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UARS WEEKLY STATUS REPORT - 12 DEC 2003
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SOLSTICE
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SOLSTICE 05 Dec 2003 Report:
SOLSTICE continues to perform nominally, taking solar data on all
available orbital tracking periods. This week we received about 55% of
each day's data amounting to nearly 370 minutes of solar observing time
per day.
SOLSTICE 12 Dec 2003 Report:
SOLSTICE began daytime only operations on Wednesday this week
(2003/344) to support the yaw maneuver. This limits our solar
observations as we are powered off during orbit night. We received
nearly 50% of each day's data amounting to 306 minutes of solar
observing time per day.
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SUSIM
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SUSIM was turned off for the yaw-around on December 10. On earlier days
this past week, the experiment successfully gathered all of its daily mid
(1.1 nm) resolution scans during periods of UARS telemetry or periods of
onboard tape recording.
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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 2002365 has been
reprocessed and archived at the GSFC DAAC.
Level 2 PEM MEPS data file documentation is complete and submitted to
the DAAC. MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 1991365.
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 attended the 3-TDRS Status meeting held on 9 December
2003.
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 November 2003 (Orbit 66833, GMT Day 333) through
05 December 2003 (Orbit 66938, GMT Day 339).
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
NONE THIS REPORT PERIOD.
The beta angle ranged between the angles of 34.9 degrees to 22.1
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 11 December 2003 (DOY 345).
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 0.95 degrees C. Additional
battery performance data for each battery on 28 November and 05
December 2003 are provided in Appendix D.
The clock error ranged from -08.4 to -02.6 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 = 00
SUSIM = 00
SOLSTICE = 00
PEM = 00
HALOE = 00
HRDI = 00
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 problem found with the CMS-B pollers has been resolved. Once the
CMS-B connectivity issue is resolved the remainder of the new CMS code
acceptance testing can be completed.
The FSW group has completed the testing of the new flight software
uplink and remove procedures. A few contingency tests will be run
next week and then the FSW portion of the 3 TDRS preparation will be
finished. End-to-end tests with all entities, DSN testing and FOD
training are the remaining tasks before the uplink can be executed.
MEETINGS
The FOT attended the UARS Monthly Status Review on 02 December 2003 to
report activities for the month of November.
The FOT also held a 3 TDRS Status Meeting on 02 December 2003 to
review the activities remaining and future plans. It was decided that
a DSN test with the spacecraft will be performed next week.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 11 December 2003 (DOY 345).
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 05 December 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
-NONE THIS REPORT PERIOD.
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 05 December 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 05 December 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period.
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 05 December 2003
28 November 2003 - GMT Day 332 Beta = 34.7 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/-156.8 +5.79/+4.50 +27.2/-14.8 24.8 1.040 20.5
3 +16.8/-89.6 +4.82/+3.87 +26.8/-15.2 24.6 1.040 20.0
05 December 2003 - GMT Day 339 Beta = 22.1 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/-16.8 +5.14/+4.50 +28.8/-13.6 25.0 1.030 20.3
3 +16.8/-22.4 +4.18/+3.23 +28.0/-13.6 24.8 1.020 20.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 05 December 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-055 FOT 66900 337/0953 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-052 FOT See List Nov 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
------ ------ ----- ---- --- -----------------
03-055 FOT See List Dec 03 30832 Generic Late Acquisition