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UARS WEEKLY STATUS REPORT - 10 Oct 2003
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM was turned on October 5 and resumed operations the next day.
Otherwise, the instrument 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 2002299 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files from 2002300
through 2002339 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.
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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 27 September 2003 (Orbit 65886, GMT Day 270)
through 03 October 2003 (Orbit 65991, GMT Day 276).
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
HALOE 272/2249 65930 POWER OFF
SUSIM 274/1805 65957 POWER OFF
SOLSTICE 274/1805 65957 DAY-ONLY MODE
A Forward-to-Reverse Yaw Around maneuver (number 123) was successfully
executed in Orbit 65987 beginning 276/ 17:04:24Z and completing at
276/ 17:41:34Z on 03 October 2003. All instruments were in their off
or standby mode (except for SOLSTICE in day-only). Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 57.89 minutes. Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.24 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.86 and 20.16 percent
respectively. The next (reverse-to-forward) YAW is scheduled for 11
November 2003 (DOY 315).
The beta angle ranged between the angles of 20.5 degrees to 03.4
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 68 degrees on 22 October 2003 (DOY 295).
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 0.96 to 1.59 degrees C. Additional
battery performance data for each battery on 26 September and 03
October 2003 are provided in Appendix D.
The clock error ranged from -09.9 to 10.5 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
HALOE = 01
SUSIM = 01
SOLSTICE = 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 FOT continues to move forward with the 3 TDRS implementation.
This week the FOT completed the process of updating the database with
the required system table changes. The new database was recompiled
and moved onto the UARS Command Management System. Now that this
activity has been completed the FOT is awaiting an official release of
the new CMS software and will then begin testing. In parallel, the
FOT will also work with the FSW group to review and test the new
flight software uplink procedure.
MEETINGS
The FOT attended the UARS Biweekly DRB Meeting on 30 September 2003.
The FOT discussed the details of the changes need from the Raytheon
development team to utilize a three TDRS mode of operations. These
changes will be made and a new Eclipse build should be delivered by
the end of October.
The FOT also attended the UARS Three TDRS Meeting on 02 October 2003.
At this meeting all the entities involved reported their current
status, and to date all tasks are proceeding as planned.
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 03 October 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65915 271/2144 03-257 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
65930 272/2249 03-258 HALOE POWER OFF
65933 273/0348 03-259 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
65957 274/1805 03-260 SUSIM POWER OFF
65957 274/1805 03-261 SOLSTICE DAY-ONLY MODE
65971 275/1542 03-262 MPS VT LV5 TO VT LV6 (FOR YAW)
65971 275/1622 03-263 PEM POWER OFF
65986 276/1619 03-262 MACS YAW (BEGIN)
65987 276/1742 03-262 MACS YAW (FWD TO REV COMPLETE)
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 03 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 03 October 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
65915 271/2144 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
65933 273/0348 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 03 October 2003
26 September 2003 - GMT Day 269 Beta = 32.9 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/-3.99 +00.0/+00.0 07.2 0.000 0.0
2 +16.8/-33.6 +5.79/+4.50 +28.0/-15.2 25.4 1.020 19.9
3 +22.4/-44.8 +4.50/+3.23 +27.2/-15.2 25.4 1.020 19.5
03 October 2003 - GMT Day 276 Beta = 03.4 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 -3.05/-4.62 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-33.6 +5.47/+4.51 +28.0/-13.6 26.2 1.020 20.0
3 +16.8/-33.6 +4.51/+2.92 +26.8/-13.6 26.2 1.020 19.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
65971 275/1542 LV5 -> LV6
APPENDIX E
UARS ANOMALY REPORTS
Week ending 03 October 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-046 FOT 65903 271/0256 30832 Generic Late Acquisition
03-050 FOT 65987 276/1742 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-046 FOT See List Sept 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
------ ------ ----- ---- --- -----------------
03-046 FOT See List Sept 03 30832 Generic Late Acquisition
03-050 FOT See List Oct 03 30832 Generic Late Acquisition