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UARS WEEKLY STATUS REPORT - 19 SEP 2003
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SOLSTICE
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SOLSTICE continues to perform nominally, taking solar data on all
available orbital tracking periods. This week we received about 45% of
each day's data amounting to about 500 minutes of solar observing time
per day.
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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 2002179, and HEPSA
data between 2002230 and 2002239 has been reprocessed and archived at the GSFC
DAAC. HEPSA data files from 2002180 through 2002229 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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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.
The MPG participated in a meeting on 18 September which was
held to discuss current status of the effort to modify UARS
ground station and flight software so that UARS can use
3 TDRS satellites each orbit.
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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 06 September 2003 (Orbit 65570, GMT Day 249)
through 12 September 2003 (Orbit 65674, GMT Day 255).
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
WINDII 254/1720 65656 POWER ON
The beta angle ranged between the angles of 38.5 degrees to 56.6
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 60 degrees on 15 September 2003 (DOY 258).
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 1.59 degrees C. Additional
battery performance data for each battery on 05 September and 12
September 2003 are provided in Appendix D.
The clock error ranged from -10.7 to 9.9 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 = 03
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Two (2) 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 patch to the Eclipse scripting executable (CECIL.exe) was
installed on the operational servers on 28 August 2003. This was done
to correct for the error found in certain IF and WAIT statement
combinations. Since the installation, no occurrences of the problem
have been seen.
MEETINGS
The FOT attended the UARS Three TDRS Meeting on 10 September 2003. At
this meeting the benefits of being able to communicate with a third
TDRS satellite were discussed. The activities and challenges involved
in making this possible were also outlined and reviewed. It was
decided that work should begin on implementing this functionality and
was approved by the UARS Project Scientist and the NASA Mission
Director.
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 12 September 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65572 249/0338 03-241 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65634 253/0623 03-242 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65656 254/1720 03-244 WINDII POWER ON
65658 254/2041 03-245 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 12 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 12 September 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
65572 249/0341 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
65634 253/0627 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65658 254/2041 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 12 September 2003
05 September 2003 - GMT Day 248 Beta = 34.8 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 -700.0/-700.0 -3.05/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-140.0 +5.79/+4.51 +27.6/-15.2 24.3 1.030 21.2
3 +11.2/-112.0 +4.83/+3.87 +27.2/-15.2 24.3 1.020 21.0
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
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 12 September 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-048 SOLSTICE 65573 249/0454 N/A SOLSTICE Rebooted
03-046 FOT 65633 253/0444 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-047 FOT 65554 247/2157 33666 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
------ ------ ----- ---- --- -----------------
03-046 FOT See List Sept 03 30832 Generic Late Acquisition
03-048 SOLSTICE 65573 249/0454 N/A SOLSTICE Rebooted