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UARS WEEKLY STATUS REPORT - 7 November 2003
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SOLSTICE
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SOLSTICE continus to operate in good health gathering solar data on all
available orbital tracking periods. This week we received about 60% of
each day's data amounting to about 550 minutes of solar observing time
per day.
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SUSIM
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SUSIM successfully gathered all of its daily mid (1.1 nm)
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 2002365 has been
reprocessed and archived 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 25 October 2003 (Orbit 66307, GMT Day 298) through
31 October 2003 (Orbit 66412, GMT Day 304).
SPACECRAFT OPERATION
The observatory is now in Reverse Flight (Northern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
PEM (Z/H) 298/1220 66315 DAY ONLY TO FULLTIME OPS
PEM (Z/H) 301/2005 66365 FULLTIME TO DAY ONLY OPS
PEM AXIS 301/2227 66366 AXIS-2 OFF
PEM (Z/H) 302/1538 66377 DAY ONLY TO FULLTIME OPS
PEM (Z/H) 303/1208 66390 FULLTIME TO DAY ONLY OPS
HALOE 303/1310 66390 POWER ON
The beta angle ranged between the angles of 65.5 degrees to 42.7
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 11 November 2003 (DOY 315).
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 1.29 degrees C. Additional
battery performance data for each battery on 24 October and 31 October
2003 are provided in Appendix D.
The clock error ranged from -10.6 to 10.0 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 = 03
SUSIM = 00
SOLSTICE = 00
PEM = 05
HALOE = 01
HRDI = 00
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
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
Another preliminary delivery of the new Eclipse software release was
installed on the prototype on 30 October 2003. This delivery
contained fixes for the problems found in the previous preliminary
build as well as the additional functionality to support DSN contacts.
The DSN command functionality was tested with Canberra on 31 October
2003. Test commands were sent and received properly by the DSN
station. The FOT is now satisfied in its ability to command through a
DSN station using the Eclipse system. The telemetry portion of DSN
capability will be tested in the upcoming weeks.
The CMS software developer found the source of the problem with new
CMS code. A change was made to a formula, which determines the size
of the ephemeris file to be built. Initial tests showed positive
results, but more analysis will be done early next week with the
simulator. If the outcome is successful another release of the CMS
software will be delivered containing this new fix.
In parallel, the FOT is also working with the FSW group to review and
test the new flight software uplink procedure. Testing has gone well
so far and should be completed by the second week in November so that
the end-to-end testing can begin.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 11 November 2003 (DOY 315).
This maneuver will be a Reverse to Forward 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 31 October 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
66315 298/1220 03-281 PEM (Z/H) DAY ONLY TO FULLTIME OPS
66346 300/1400 03-282 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
66365 301/2005 03-283 PEM (Z/H) FULLTIME TO DAY-ONLY OPS
66366 301/2227 03-284 PEM AXIS AXIS-2 OFF
66377 302/1538 03-285 PEM (Z/H) DAY ONLY TO FULLTIME OPS
66379 302/1857 03-286 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66390 303/1208 03-287 PEM (Z/H) TO DAY-ONLY OPS
66390 303/1310 03-288 HALOE POWER ON
66400 304/0429 03-289 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 31 October 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 31 October 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
66346 300/1400 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
66379 302/1857 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
66400 304/0429 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 31 October 2003
24 October 2003 - GMT Day 297 Beta = 67.3 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 -2.74/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-22.4 +3.55/+1.97 +19.2/-15.2 26.7 1.050 15.7
3 +11.2/-33.6 +2.60/+1.34 +18.8/-14.8 26.7 1.050 15.4
31 October 2003 - GMT Day 304 Beta = 42.7 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/-4.63 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-50.4 +5.79/+4.50 +26.4/-15.2 24.6 1.050 20.5
3 +16.8/-67.2 +4.50/+3.23 +25.6/-15.2 24.5 1.040 20.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 31 October 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-050 FOT 66311 298/0712 30832 Generic Late Acquisition
03-050 FOT 66356 301/0703 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
03-050 FOT See List Oct 03 30832 Generic Late Acquisition