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UARS WEEKLY STATUS REPORT - 18 JUL 2003
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SOLSTICE
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Nothing received.
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SUSIM
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On Thursday July 17, SUSIM gathered little or no solar data because
the no sun commands were received from the SSPP.
For the remaining days this past week, 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.
SUSIM successfully completed its major, "yearly" (4 lamp) calibration
last week. SUSIM is now operating with a new MgF2 entrance filter
used for the short wavelength half of the UV spectrum.
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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 2002089 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files for 2002090
through 2002099 are awaiting archiving at the GSFC 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.
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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 05 July 2003 (Orbit 64623, GMT Day 186) through 11
July 2003 (Orbit 64727, GMT Day 192).
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 188/1808 64664 POWER ON
WINDII 189/0022 64668 POWER OFF
HRDI 189/1543 64678 POWER ON
PEM 192/1355 64723 POWER ON
The beta angle ranged between the angles of 79.1 degrees to 64.0
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 26 July 2003 (DOY 207).
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 0.54 to 0.94 degrees C. Additional
battery performance data for each battery on 04 July and 11 July 2003
are provided in Appendix D.
The clock error ranged from -12.2 to 10.9 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 = 06
SUSIM = 01
WINDII = 03
HRDI = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Two (2) Anomaly Report 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
TMON-1 tripped onboard UARS on 07 July 2003 at approximately 189/0022
GMT. A WINDII turn on was executed about 4 orbits earlier, which
brought the load bus down to 23.5 and caused TMON-1 to trip. TMON-1
powered off both WINDII and HRDI. HRDI was in standby mode and not
taking data at the time, but WINDII's science collection was
terminated. The UARS power subsystem recovered on the following orbit
and HRDI was rebooted on 07 July 2003 at on the 189/1643 GMT event.
It turns out that the HRDI reboot cleared a HDRI operation error that
had been seen for the last month.
Also this week, IPNOC took over management of the CISCO switches on 08
July 2003. This required some minor configuration changes to be made
to the switches and a reboot of the servers. The ground system has
run without incident since the change and IPNOC will now be able to
troubleshoot network anomalies more thoroughly.
MEETINGS
- None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 26 July 2003 (DOY 207). 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 11 July 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
64639 187/0210 03-168 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64662 188/1406 03-169 SUSIM UPCMDARG FIX
64664 188/1808 03-170 WINDII POWER ON
64668 189/0022 03-171 WINDII POWER OFF (LOW POWER)
64669 189/0056 03-172 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
64675 189/1109 03-173 MPS CLEAR TMONS
64676 189/1221 03-174 WINDII MUB DISABLE
64678 189/1543 03-175 HRDI POWER ON
64678 189/1625 03-175 HRDI POWER ON / PMON GRP ENABLE
64703 191/0740 03-176 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64722 192/1355 03-177 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
64722 192/1355 03-178 PEM AXIS POWER ON
64723 192/1617 03-179 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 11 July 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 11 July 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
64639 187/0213 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64669 189/0056 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
64703 191/0740 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64722 192/1355 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
64723 192/1617 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 11 July 2003
04 July 2003 - GMT Day 185 Beta = 77.4 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 -2.11/-3.05 +00.0/-00.0 07.2 0.000 0.0
2 +05.6/-50.4 +2.92/+1.34 +12.8/-13.6 26.2 1.030 10.4
3 +22.4/-05.6 +1.97/+0.71 +12.8/-13.6 26.2 1.020 10.3
11 July 2003 - GMT Day 192 Beta = 64.0 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 -2.73/-4.31 +00.0/-00.0 07.2 0.000 0.0
2 +00.0/-33.6 +3.14/+2.60 +20.0/-13.6 26.4 1.020 17.0
3 +16.8/-22.4 +2.60/+1.66 +19.2/-13.2 26.4 1.010 16.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 11 July 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-031 FOT 64641 187/0431 30832 Generic Late Acquisition
03-033 FOT 64668 189/0022 N/A PMON-1 tripped due to low pwr
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-030 FOT 64519 179/0254 33093 Tlm dropout 2:28
03-032 FOT 64596 184/0436 30824 Fwd Link Failover 2:27
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
------ ------ ----- ---- --- -----------------
03-031 FOT See List July 03 30832 Generic Late Acquisition
03-033 FOT 64668 189/0022 N/A PMON-1 tripped due to low pwr